Systems and methods for tibial implants

Abstract

Systems, methods, devices, and apparatuses described herein relate to a tibial implant system, likely for ankle joint replacement, comprising a separate tibial implant base and a tibial implant cover. Both components feature tapered stems dimensioned to mate with each other. In various embodiments, the stems include aligned fixation apertures, creating two or more through holes in the combined implant potentially for receiving fixation screws. The tibial implant base underside includes stabilization flanges and may have a central threaded hole, configured to interface and stabilize against a second implant component, not directly bone. An optional anterior notch on the cover can mate with a corresponding feature on the base for alignment. The tibial implant cover may be solid or configured as a lattice structure, potentially promoting biological integration. The system allows for variable sizing, likely by adjusting the anterior-posterior length. Methods of manufacturing and assembling the components are also described.

Description

SYSTEMS AND METHODS FOR TIBIAL IMPLANTSPRIORITY

[0001] This application claims the benefit of and priority to U.S. Provisional Application, filed on April 15, 2024 and having application serial number 63 / 634,373, and U.S. Provisional Application filed on April 15, 2024 and having application serial number 63 / 634,382 the entirety of each of said applications being incorporated herein by reference.FIELD

[0002] Embodiments of the present disclosure generally relate to the field of surgical implants. More specifically, embodiments of the disclosure relate to an apparatus and methods for a tibial implant for treating tibial defects or revisioning previous implants.BACKGROUND

[0003] The tibia, or shinbone, is the larger bone of the lower leg, extending down towards the foot. At its lower end, it forms the upper and inner part of the ankle joint. The talus is a crucial bone in the foot, situated directly below the tibia, connecting the leg bones to the rest of the foot. The primary joint articulation between these two bones, the tibiotalar joint, is a component of the ankle joint, allowing for the up-and-down motion (dorsiflexion and plantarflexion) essential for walking and movement. Implants in this area typically resurface or replace parts of the lower tibia and the upper talus within the ankle joint.

[0004] Damage or degeneration of the tibiotalar joint is the main reason for needing an ankle implant, often as part of a total ankle replacement or sometimes an ankle fusion procedure. Severe arthritis, particularly osteoarthritis, rheumatoid arthritis, or post-traumatic arthritis resulting from previous ankle fractures or injuries, commonly leads to cartilage loss, pain, and stiffness in this joint. Significant ankle instability, deformity, bone defects, or the failure of previous ankle surgeries (necessitating revision) can also necessitate implants to restore function and alleviate pain by replacing the damaged joint surfaces of the lower tibia and upper talus.

[0005] During the surgical procedure, challenges can arise with the precise physical placement and insertion of tibial and talar implants. Accurately preparing the bone surfaces of the tibia andtalus to accurately match the implant shapes is critical but can be difficult. Inserting and aligning the implant components requires careful alignment; incorrect positioning, even by small amounts, can affect joint mechanics. If the implants are not securely fixed or optimally positioned from the start, this poor initial attachment can lead to significant problems over time, such as micromotion at the implant-bone interface, uneven load distribution causing accelerated wear or implant breakage, eventual loosening from the bone, subsidence (sinking) of the components, joint instability, and ultimately, the potential need for complex revision surgery.SUMMARY

[0006] An apparatus, systems, and methods are provided for an improved tibia implant with a tapered stem and dual fixation holes for treating tibial defects. In some embodiments, a tibial implant, includes a tibial implant base, including: a body with a top base surface, a tapered base stem extending in a generally perpendicular direction from the top base surface, and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered base stem, and a tibial implant cover, including: a body with a top cover surface, a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem, and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered cover stem, wherein the tibial implant cover is configured to mate with the tibial implant base such that at least the two through holes created through the tapered base stem and the at least two through holes created through the tapered cover stem are aligned to create at least two through holes through the tibial implant.

[0007] In some embodiments, the at least two through holes are configured to receive at least two fixation screws.

[0008] In some embodiments, the tibial implant base further includes: a central fixation threaded hole, and a raised notch corresponding to the threaded hole extending on the top base surface.

[0009] In some embodiments, the tibial implant cover further includes an anterior notch, wherein the anterior notch is configured to mate with the raised notch of the top base surface.

[0010] In some embodiments, the anterior notch extends from the anterior cover side to the anterior side of the tapered cover stem.

[0011] In some embodiments, the tibial implant base further includes a pair of stabilization flanges configured on the anterior base side.

[0012] In some embodiments, the pair of stabilization flanges are configured to mate with at least one protrusion from a second implant component.

[0013] In some embodiments, the tibial cover is configured in a lattice structure.

[0014] In some embodiments, the lattice structure is configured with a material suitable for interfacing with bone.

[0015] In some embodiments, the lattice structure is configured such that a majority of the space is a void.

[0016] In some embodiments, the tibial base implant further includes a left base cavity on the anterior side, and a right base cavity on the anterior side, wherein the left base cavity and right base cavity are configured for use by one or more targeting devices for positioning.

[0017] In some embodiments, the portion of the tibial implant base can be extended along the body in the area between the tapered base stem and posterior base side, the portion of the tibial cover base can be extended along the body in the area between the tapered cover stem and posterior cover side, wherein the extensions are matched to allow for implants of various sizes.

[0018] In some embodiments, a tibial implant, includes a tibial implant base, including a body with a top base surface, a tapered base stem extending in a generally perpendicular direction from the top base surface, and a base lip extending upward along the perimeter of the top base surface, and a tibial implant cover, including a body with a top cover surface dimensioned similarly to the top base surface, a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem, and a cover lip extending along the perimeter of the top cover surface, wherein the tibial implant cover is configured to mate with the tibial implant base through at least an interaction between the base lip and the cover lip.

[0019] In some embodiments, the tibial implant base further includes: a central fixation threaded hole, and a raised notch corresponding to the threaded hole extending on the top base surface.

[0020] In some embodiments, the tibial implant cover further includes an anterior notch, wherein the anterior notch is configured to mate with the raised notch of the top base surface.

[0021] In some embodiments, a method of producing a tibial implant, the method includes manufacturing a tibial implant base, wherein the tibial implant base includes at least a body with a top base surface, a tapered base stem extending in a generally perpendicular direction from the top base surface, and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered base stem, manufacturing a tibial implant cover wherein the tibial implant base includes at least a body with a top cover surface, a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem, and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered cover stem, and mating the tibial implant cover to the tibial implant base such that at least the two through holes created through the tapered base stem and the at least two through holes created through the tapered cover stem are aligned to create at least two through holes through the tibial implant.

[0022] In some embodiments, the at least two through holes are configured to receive at least two fixation screws.

[0023] In some embodiments, the two fixation screws are configured between twenty millimeters to sixty millimeters in length.

[0024] In some embodiments, the thickness of the tibial implant cover is one millimeter across a majority of the body.

[0025] In some embodiments, the tibial implant cover further includes an anterior notch and the thickness of the tibial implant cover is less than one millimeter over the notch such that the planar surface of the top cover surface is maintained.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings refer to embodiments of the present disclosure in which:

[0027] FIG. 1 illustrates a perspective view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0028] FIG. 2A illustrates a top-down view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0029] FIG. 2B illustrates a bottom-up view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0030] FIG. 2C illustrates a front view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0031] FIG. 2D illustrates a rear view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0032] FIG. 2E illustrates a right-side view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0033] FIG. 2F illustrates a left-side view of a tibial implant base, in accordance with various embodiments of the disclosure;

[0034] FIG. 3 illustrates a perspective view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0035] FIG. 4A illustrates a top-down view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0036] FIG. 4B illustrates a bottom-up view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0037] FIG. 4C illustrates a front view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0038] FIG. 4D illustrates a rear view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0039] FIG. 4E illustrates a left view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0040] FIG. 4F illustrates a right view of a tibial implant cover, in accordance with various embodiments of the disclosure;

[0041] FIG. 5 illustrates a perspective view of a lattice tibial implant cover, in accordance with various embodiments of the disclosure;

[0042] FIG. 6A illustrates a lattice tibial implant cover being placed on top of a tibial implant base, in accordance with various embodiments of the disclosure;

[0043] FIG. 6B illustrates a combined tibial implant comprising a lattice tibial implant cover and tibial implant base, in accordance with various embodiments of the disclosure;

[0044] FIG. 7 illustrates a top-down isometric view of two tibial implants of different sizes in accordance with various embodiments of the disclosure;

[0045] FIG. 8 illustrates a dual perspective view of a combined tibial implant in accordance with various embodiments of the disclosure.

[0046] While the present disclosure is subject to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. The invention should be understood to not be limited to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.DETAILED DESCRIPTION

[0047] Joints such as the ankle facilitate articulation and load bearing but can become damaged due to conditions like arthritis, acute trauma, or cumulative wear over time. Such damage often affects the bones forming the joint, including the distal tibia and the talus, leading to pain, instability, and loss of function. Surgical intervention, including total joint arthroplasty, is oftenemployed to address severe joint damage. These procedures typically involve replacing the damaged bone surfaces with prosthetic components, including a tibial implant component designed to interface with the prepared tibia and articulate with other prosthetic parts, such as a talar component. While various tibial implant designs exist, including modular systems, there remains a need for improved designs that offer secure fixation, stable mating between components, options for biological integration, and potentially streamlined assembly or revision capabilities. Provided herein are embodiments and methods for a modular tibial implant system addressing these needs.

[0048] Also disclosed herein are methods for producing a tibial implant according to various embodiments. One such method may comprise multiple steps, beginning with manufacturing a tibial implant base. This base component can be manufactured to include at least a body having a top base surface and a tapered base stem extending in a generally perpendicular direction from that top base surface. Furthermore, the manufacturing process for the base may incorporate the formation of at least two fixation apertures situated on different sides of the tapered base stem, configured such that they create at least two through holes passing through the tapered base stem.

[0049] The method may further comprise manufacturing a corresponding tibial implant cover. This cover component can be manufactured to include at least a body defining a top cover surface and a tapered cover stem extending generally perpendicularly from the top cover surface (typically from its underside). In many embodiments, the tapered cover stem of the cover is dimensioned during manufacturing specifically to mate with the previously manufactured tapered base stem. Similar to the base, the cover's manufacturing step may include forming at least two fixation apertures on different sides of its tapered cover stem, creating at least two through holes within the cover stem. A subsequent step in the method involves mating the manufactured tibial implant cover to the manufactured tibial implant base. This mating is performed such that the through holes within the tapered base stem align with the through holes within the tapered cover stem, thereby resulting in the creation of at least two continuous through holes extending through the combined stem structure of the assembled tibial implant.

[0050] The embodiments depicted in the figures are provided by way of example only. The drawings are not necessarily to scale, and relative proportions or specific dimensions shown areillustrative and may be modified. Various features depicted in the figures may be combined, omitted, or rearranged in different ways, and equivalents of the depicted structures and configurations are intended to be encompassed within the scope of this disclosure. The description accompanying the figures is intended to be illustrative and not limiting; the scope of the invention is defined by the appended claims.

[0051] Materials suitable for constructing the components described herein, such as the tibial implant base and the tibial implant cover, may include various biocompatible materials known in the art for orthopedic implants. Examples can include, but are not limited to, metals such as titanium, titanium alloys, cobalt-chromium alloys, stainless steel; polymers; ceramics; or combinations thereof. The selection of a specific material may depend on factors like structural requirements, desired biocompatibility, wear characteristics, manufacturing methods (e.g., additive manufacturing for lattice structures, machining for solid components), and interfacing properties, and the examples provided are not intended to be exhaustive.

[0052] Positional and directional terms such as "anterior," "posterior," "superior," "inferior," "medial," "lateral," "top," "bottom," "upward," "downward," and the like are used herein for convenience to describe the embodiments as typically oriented or viewed, often with reference to standard anatomical positioning or the implant's orientation as depicted. Unless otherwise specified or required by the context, these terms are not intended to be strictly limiting or absolute. For instance, "superior" may refer to a direction generally towards the head in anatomical terms or away from the bone interface surface of the base component, but the implant could potentially be oriented differently during use or analysis.

[0053] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be apparent, however, to one of ordinary skill in the art that the invention disclosed herein may be practiced without these specific details. In other instances, specific numeric references such as “first implant,” may be made. However, the specific numeric reference should not be interpreted as a literal sequential order but rather interpreted that the “first implant” is different than a “second implant.” Thus, the specific details set forth are merely exemplary. The specific details may be varied from and still be contemplated to be within the spirit and scope of the present disclosure. The term “coupled” is defined asmeaning connected either directly to the component or indirectly to the component through another component. Further, as used herein, the terms “about,” “approximately,” or “substantially” for any numerical values or ranges indicate a suitable dimensional tolerance that allows the part or collection of components to function for its intended purpose as described herein.

[0054] Referring now to FIG. 1, a perspective view of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. In many embodiments, the tibial implant base 100 may comprise a generally planar body defining a top base surface 110, which can be configured to interface, directly or indirectly, with other implant components or bearing surfaces (not shown in FIG. 1). Extending generally perpendicular from the top base surface 110 may be a tapered base stem 120, potentially adapted for insertion into a prepared tibial bone cavity. The tapered base stem 120 may include one or more fixation apertures, shown in this embodiment as a superior stem hole 121 and an inferior stem hole 122, which could be configured to receive bone screws or other fixation elements. Together, the fixation apertures are configured in various embodiments such that at least two through holes are created through the tapered base stem.

[0055] In a number of embodiments, the periphery of the tibial implant base 100 can include several defined sides. As oriented in FIG. 1, the tibial implant base 100 can include a right base side 160, a left base side 170, a posterior base side 180, and an anterior base side (corresponding generally to the anterior base side 190, though not explicitly labeled in this view but indicated by the presence of base lip 115). A base lip 115 may be seen extending slightly upward from the top base surface 110 along the anterior aspect. In more embodiments, the base lip 115 can be configured to interface or otherwise cooperate with one or more other implant components (not shown in FIG. 1).

[0056] In further embodiments, the underside of the tibial implant base 100 (partially visible in this perspective view) may include features configured for engagement with bone or other implant structures. These features, generally indicated by the stabilization flange width 150, are further detailed in other figures but can include protrusions and potentially a central fixation threaded hole 155. Also indicated are general areas that correspond to a right base cavity 130 and a left base cavity 140, which can represent recessed areas or specific contouring of the base perimeter.

[0057] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 1 , any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the tibial implant base 100 may be made from a metal or some other material suitable for implantation. The elements depicted in FIG. 1 may also be interchangeable with other elements of FIG. 2A-8 as required to realize a particularly desired embodiment.

[0058] Referring to FIG. 2A, a top-down view of a tibial implant base, in accordance with various embodiments of the disclosure is shown. This view primarily shows the top base surface 110 of the body of the tibial implant base 100. The overall peripheral shape of the top base surface 110 can be observed from this view, defining areas corresponding generally to a right base side 160 comprising a fibular notch, a left base side 170, a posterior base side 180, and an anterior base side 190. The specific contouring may vary, potentially offering an anatomical fit or specific interface characteristics with surrounding structures or other implant components.

[0059] From this top-down perspective, the location where the tapered base stem 120 extends from the top base surface 110 can be seen, positioned generally centrally but potentially offset relative to the absolute center of the top base surface 110, for instance, towards the posterior base side 180 as depicted. The cross-sectional shape of the tapered base stem 120 at or near its junction with the top base surface 110 is visible. While internal features such as fixation apertures (e.g., 121, 122) may not be fully detailed in this view, the stem 120 provides the structure wherein such features creating through holes may be formed, consistent with many embodiments. Features on the top base surface 110 related to interaction or alignment are also shown. F or instance, the region near the tapered base stem 120 and towards the anterior base side 190 may include surface features, potentially such as a raised notch 159 corresponding to an underlying central fixation threaded hole. In some embodiments, the raise notch may extend from the anterior base side to the anterior side of the tapered base stem 120.

[0060] The top-down view provided in FIG. 2A may further aid in understanding the spatial relationship of peripheral features relative to the main body and stem. Areas designated as the left base cavity 140 and right base cavity 130 can be generally located near the anterior base side 190and extending towards the left base side 170 and right base side 160, respectively. In a number of embodiments, such cavities or related features in these locations might be configured for interaction with surgical instruments or targeting devices during implantation. The overall dimensions and proportions visible in this view can also relate to different implant sizes, potentially achieved by extending portions between the tapered base stem 120 and the posterior base side 180.

[0061] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2A, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the top base surface 110 may incorporate texturing or features to promote adhesion with other components. The elements depicted in FIG. 2A may also be interchangeable with other elements of FIGS. 1 and 2B-8 as required to realize a particularly desired embodiment.

[0062] Referring to FIG. 2B, a bottom-up view of a tibial implant base, in accordance with various embodiments of the disclosure is shown. This view shows the underside or interfacing surface of the tibial implant base 100, which may be configured to mate with a corresponding surface of a second implant component (such as, but not limited to, a talar component, not shown). The general peripheral outline can be seen from this perspective, defining the extent of the base and indicating the relative locations corresponding to the right base side 160, left base side 170, posterior base side 180, and anterior base side (190, not labeled but opposite 180).

[0063] Prominently visible in this bottom-up view are features potentially related to the alignment, fixation, and stabilization between the tibial implant base 100 and a second implant component. A structure, indicated generally by stabilization flange width 150, may be present, particularly towards the anterior base side. This structure can comprise a pair of stabilization flanges, identified as a right stabilization flange 151 and a left stabilization flange 152. These flanges (151, 152) may be configured with specific geometries, such as angled or rail-like features, potentially adapted to mate with or engage corresponding recesses, protrusions, or features on the second implant component for enhanced stability and proper alignment. Also, visible centrally within this stabilization flange width 150 may be a central fixation threaded hole 155, consistentwith various embodiments, which could be configured to receive a fixation screw or engage a corresponding post or feature extending from the second implant component.

[0064] The underside view in FIG. 2B further illustrates at least some of the relationships between various interfacing features (150, 151, 152, 155) and the overall body of the tibial implant base 100. The relative positioning and dimensions of these features can contribute to the implant’s resistance to rotational and translational forces relative to the mating implant component. The surface characteristics of this underside might also be prepared or textured (not explicitly shown) to optimize the mechanical interface with the second implant component.

[0065] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2B, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the interface between the stabilization flanges 151, 152 and a mating component may incorporate additional locking mechanisms in certain embodiments. The elements depicted in FIG. 2B may also be interchangeable with other elements of FIGS. 1-2 A, and 2C-8 as required to realize a particularly desired embodiment.

[0066] Referring to FIG. 2C, a front view of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. This view illustrates the profile of the base as seen from the anterior side (190, not labeled but implied by context). Visible components may include the main body of the tibial implant base 100, the tapered base stem 120 extending generally perpendicularly upward (superiorly) from the body’s top base surface (110, not visible in this profile), and certain features located on the underside of the base. The overall width of the base in this perspective, potentially defined between the right base cavity 130 and left base cavity 140 (representing general side extents or features), can also be observed.

[0067] The tapered base stem 120 is shown prominently in this anterior view, illustrating its potential shape and taper along its height. This stem 120 may be configured for insertion into a prepared bone cavity, providing stability for the implant assembly, consistent with many embodiments. While fixation apertures (such as 121, 122) may exist within the tapered base stem 120 to create through holes, the openings for these apertures might not be directly visible from this specific anterior viewpoint, depending on their exact placement and orientation.

[0068] The embodiment depicted in FIG. 2C also provides a view of certain underside features from the anterior perspective. The central fixation threaded hole 155 may be visible on the bottom aspect of the base, positioned generally centrally along the width. The fixation threaded hole 155, such as shown in the embodiment of FIG. 2C may be a portion or half of a threaded hole that is meant to cooperate with a second half or portion from an additional implant component such that it may affix the two components to each other. Flanking the central fixation threaded hole 155, portions of the right stabilization flange 151 and the left stabilization flange 152 can also be seen extending downward from the main body. These stabilization flanges (151, 152) may possess specific geometries configured to engage or mate with corresponding structures on a second implant component to provide alignment and rotational stability to the combined implant construct.

[0069] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2C, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the tapered base stem 120 could incorporate alternative surface treatments or geometries based on the specific application and / or patient. The elements depicted in FIG. 2C may also be interchangeable with other elements of FIGS. 1-2B and 2D-8 as required to realize a particularly desired embodiment.

[0070] Referring to FIG. 2D, a rear view of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. FIG. 2D shows a posterior view, or rear view, of the tibial implant base 100 according to certain embodiments. This perspective illustrates the tibial implant base 100 as observed from the posterior side (180). Some features visible may include the posterior base side 180 of the main body and the tapered base stem 120 extending generally perpendicularly upward (superiorly) from the top base surface (110, not visible in this view). A feature identified as a posterior opening 181 may also be visible along the lower edge of the posterior base side 180.

[0071] The tapered base stem 120 is depicted from the rear in FIG. 2D, showing its profile and potential taper along its length. As described previously, this stem 120 can be configured for engagement within a prepared bone structure. Fixation apertures (such as 121, 122) that mightform through holes within the stem may not be apparent from this specific posterior view, depending on their configuration.

[0072] This posterior view also highlights the posterior base side 180. The dimension between the tapered base stem 120 and this posterior base side 180 may be significant that this portion of the tibial implant base can be extended or varied to achieve implants of different overall anterior- posterior sizes. The posterior opening 181, visible at the inferior edge of the posterior base side 180, could potentially relate to manufacturing processes, provide clearance for other components, or serve as an alignment or handling feature.

[0073] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2D, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the posterior base side 180 could feature markings or indicators for alignment. The elements depicted in FIG. 2D may also be interchangeable with other elements of FIGS. 1-2C, 2E-8 as required to realize a particularly desired embodiment.

[0074] Referring to FIG. 2E, a right-side view of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. This view shows the profile of an embodiment of the tibial implant base 100 when observed from the right base side 160. The overall height and length profile of the main body portion of the tibial implant base 100 may be discernible in this view, along with the tapered base stem 120 extending generally perpendicularly upward (superiorly) from the top base surface (110, not labeled in this view). Features associated with the right base side 160 and the right base cavity 130 may also be visible.

[0075] The tapered base stem 120 is shown in profile in this right-side view, illustrating its potential contour and height relative to the main body. Significantly, this view clearly depicts at least two fixation apertures located on the side of the tapered base stem 120. Specifically, a superior stem hole 121 and an inferior stem hole 122 can be identified. These apertures (121, 122) may be configured as through holes extending through the tapered base stem 120. Furthermore, these through holes may be dimensioned and configured to receive fixation elements, such as fixation screws, to potentially secure the implant to bone or other components.

[0076] The main body portion of the tibial implant base 100 is also partially depicted in profile along the right base side 160. Features such as the right base cavity 130, located generally towards the anterior aspect in this view, can be observed. The shape and depth of such cavities or side features might relate to the overall anatomical design, provide clearance, or potentially interact with surgical instrumentation or corresponding features on mating implant components. The overall profile shown in FIG. 2E contributes to the understanding of the three-dimensional form of the tibial implant base 100.

[0077] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2E, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the number and placement of stem holes (121, 122) could be varied. The elements depicted in FIG. 2E may also be interchangeable with other elements of FIGS. 1-2D, and 2F-8 as required to realize a particularly desired embodiment.

[0078] Referring to FIG. 2F, a left-side view of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. This illustration presents the profile of an embodiment of the tibial implant base 100 when viewed from the left base side 170. The profile may reveal the general dimensions, such as height and length, of the main body portion of the tibial implant base 100 relative to other components. The tapered base stem 120 can be seen extending generally perpendicularly upward (superiorly) from the top base surface (110, not labeled). Features associated with the left base side 170, such as the left base cavity 140 and a left side feature 175, may also be apparent, along with the relative position of the posterior base side 180.

[0079] The tapered base stem 120 is shown in profile from the left side in this figure. Similar to the right-side view (FIG. 2E), this perspective may clearly show within the embodiment, at least two fixation apertures positioned on the side of the tapered base stem 120. A superior stem hole 121 and an inferior stem hole 122 can typically be identified in such a view. In many embodiments, these apertures (121, 122) may be configured as through holes extending through the tapered base stem 120. Moreover, in various embodiments, these through holes may be suitably dimensioned and configured to receive fixation elements like fixation screws, contributing to anchoring the implant.

[0080] The left-side view also provides information about the main body's profile along the left base side 170. Features visible may include the left base cavity 140, generally located towards the anterior aspect, and potentially another contour or recess identified as the left side feature 175. The left base cavity 140, in certain embodiments, might be configured for use by targeting devices or surgical positioning instruments. The left side feature 175 could represent anatomical contouring, clearance for other structures, an area that will contract bone or other soft tissue, or features related to the implant’s manufacturing or handling.

[0081] Although a specific embodiment for a tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 2F, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the left side feature 175 could be shaped differently to accommodate anatomical variations or surgical approaches or may be entirely removed. The elements depicted in FIG. 2F may also be interchangeable with other elements of FIGS. 1-2E, and 3-8 as required to realize a particularly desired embodiment.

[0082] Referring to FIG. 3, a perspective view of a tibial implant cover 200, in accordance with various embodiments of the disclosure is shown. This component, the tibial implant cover 200, may be configured to mate with or be placed upon a corresponding tibial implant base (such as, but not limited to, the tibial implant base 100 shown in FIG. 1), thereby forming a combined tibial implant assembly (300, FIG. 6B). The tibial implant cover 200 can present a top cover surface 210, which, in an assembled state, might serve as an articulation surface or provide an interface for bone, soft tissue, or other components within the joint replacement system. The overall shape and periphery of the tibial implant cover 200 may be designed to generally match or complement the corresponding tibial implant base.

[0083] Extending generally perpendicularly from the underside (not fully visible in FIG. 3 but implied) of the top cover surface 210 may be a tapered cover stem 220. As shown in the embodiment of FIG. 3, this tapered cover stem 220 can be dimensioned to mate appropriately with the tapered base stem of a tibial implant base. The tapered cover stem 220 may further comprise at least two fixation apertures, illustrated here as a superior stem hole 221 and an inferior stem hole 222. These apertures (221, 222) can form through holes within the tapered cover stem 220and may be positioned such that, when the tibial implant cover 200 is mated with a tibial implant base, they align with corresponding through holes (e.g., 121 , 122) in the tapered base stem, thereby creating aligned through holes in the combined implant assembly. Such aligned through holes could be configured to receive fixation elements, such as, but not limited to, screws.

[0084] Additional features may be present on the tibial implant cover 200 as depicted in FIG.3. A cover lip 215 can extend along at least a portion of the periphery, such as the anterior edge shown here, potentially interacting with a corresponding base lip 115 on the tibial implant base in certain embodiments. An anterior notch 219 may also be formed along the anterior edge, potentially extending towards the tapered cover stem 220. This anterior notch 219 could be configured to mate with a corresponding feature, such as a raised notch, on the tibial implant base, potentially aiding in alignment or locking. While FIG. 3 shows a generally solid cover, alternative embodiments might configure the tibial implant cover 200 with an alternative structure, potentially having specific thickness characteristics.

[0085] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 3, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the top cover surface 210 could have varying contours or thicknesses depending on the specific application. The elements depicted in FIG. 3 may also be interchangeable with other elements of FIGS. 1-2F and 4A-8 as required to realize a particularly desired embodiment.

[0086] Referring to FIG. 4A, a top-down view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. This view illustrates an embodiment of the top cover surface 210 of the body of the tibial implant cover 200. The overall peripheral shape of the cover can be observed, which may be dimensioned similarly to a corresponding tibial implant base. This periphery can define general areas corresponding to a right cover side 260, a left cover side 270, a posterior cover side 280, and an anterior cover side 290. The top cover surface 210 itself may be generally planar or contoured, potentially serving as an articulation surface or an interface layer.

[0087] Visible from this embodiment of the top-down perspective is the location where the tapered cover stem 220 joins or integrates with the top cover surface 210, typically extending perpendicularly from the underside through the top surface of the tibial implant cover 200. In other words, the tapered cover stem 220 can be understood as being deformed from the underside of the tibial implant cover 200 upward such that it is generally perpendicular from the top cover surface 210. The cross-sectional shape or footprint of the tapered cover stem 220 at this junction can be seen. As shown in this embodiment, the tapered cover stem 220 may be dimensioned to mate with a corresponding tapered base stem. While internal features like stem holes (221, 222) are not visible in this view, the structure of the stem 220 is apparent.

[0088] The overall proportions of the tibial implant cover 200 are also discernible in FIG. 4A relative to other structures. The dimensions, for instance, the extent between the tapered cover stem 220 and the posterior cover side 280, could potentially be varied in different embodiments to correspond with tibial implant bases of various sizes, thus creating matched implant sets. This top view emphasizes the surface area provided by the top cover surface 210, which may be critical for load distribution or biological interfacing depending on the cover's material and configuration (e.g., solid vs. lattice, etc.).

[0089] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4A, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the top cover surface 210 could incorporate specific articulation geometries depending on the patient utilizing the implants. The elements depicted in FIG. 4A may also be interchangeable with other elements of FIGS . 1 -3 , 4B-8 as required to realize a particularly desired embodiment.

[0090] Referring to FIG. 4B, a bottom-up view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. This view of the embodiment primarily shows the underside surface of the cover’s body, which may be configured to interface directly with the top base surface of a corresponding tibial implant base. The peripheral outline of the tibial implant cover 200 is visible, indicating the general extents corresponding to the right cover side 260, left cover side 270, posterior cover side 280, and anterior cover side 290.

[0091] In many embodiments, a feature identified as the tapered cover stem cavity 229 is visible. This cavity 229 represents the recess or internal space within the tapered cover stem (220, visible in other views) and may be dimensioned and shaped to receive and mate with a tapered base stem of a tibial implant base, consistent with the mating configuration of various embodiments. Also, potentially visible in various embodiments from this underside perspective along the anterior cover side 290 is the opening or underside aspect of the anterior notch 219.

[0092] In more embodiments, the nature of the underside surface surrounding the tapered cover stem cavity 229 can also be observed. This surface might be generally planar or possess specific contours designed to closely match and interface with the top base surface of the tibial implant base. This mating interface can be configured to enhance the stability and function of a combined tibial implant. Features facilitating this mating, beyond the stem interaction, may also be incorporated into this underside surface in various embodiments.

[0093] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4B, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the tapered cover stem cavity 229 could incorporate one or more interface elements to enhance rotational stability when mated with the base stem. The elements depicted in FIG. 4B may also be interchangeable with other elements of FIGS. 1-4A, 4C-8 as required to realize a particularly desired embodiment.

[0094] Referring to FIG. 4C, a front view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. The view of this embodiment shows the profile of the tibial implant cover 200 as seen from the anterior side (290, not labeled). The edge view of the top cover surface 210 is visible, defining the upper boundary of the cover's body in this orientation. Extending generally perpendicularly downward (inferiorly relative to the top cover surface 210) is the tapered cover stem 220.

[0095] The tapered cover stem 220 is shown in profile from the anterior perspective. Its shape, potentially tapering along its length, can be discerned in this embodiment. As part of the tibial implant cover, this tapered cover stem 220 may typically be dimensioned to mate with a corresponding tapered base stem of a tibial implant base. Fixation apertures (e.g., 221 , 222) whichmay form through holes might exist within the stem but may not be visible from this direct frontal view.

[0096] Other features may be apparent to those skilled in the art in this anterior view. A left side feature cover 275 can be seen extending downward from the main body near the left cover side (270, not labeled). This feature might provide additional interfacing surfaces (such as for bone and / or soft tissue), act as an alignment guide, and / or serve another functional purpose. The thickness of the body portion defining the top cover surface 210 is also depicted in profile, which may be relevant to embodiments that are configured for specific cover thicknesses, potentially being around one millimeter in certain embodiments. In some embodiments, this overall thickness may possibly be excluded for features like the tapered cover stem 220, left side feature cover 275 or anterior notch 219.

[0097] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4C, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the left side feature cover 275 could be mirrored on the right side or omitted in alternative embodiments. The elements depicted in FIG. 4C may also be interchangeable with other elements of FIGS. 1-4B, 4D-8 as required to realize a particularly desired embodiment.

[0098] Referring to FIG. 4D, a rear view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. This view illustrates the profile of the tibial implant cover 200 when observed from the posterior side (280, not labeled). Visible elements of this embodiment include the posterior edge profile of the top cover surface 210 and the tapered cover stem 220 extending generally perpendicularly downward (inferiorly relative to the top cover surface 210). A feature designated as the left side feature cover 275 may also be visible from this perspective, depending on its lateral extent.

[0099] The tapered cover stem 220 is shown in profile from the posterior. Its general shape and taper along its length can be observed by those skilled in the art. This tapered cover stem 220, as part of the cover, is typically configured to mate with a corresponding tibial implant base stem.Fixation apertures (such as 221, 222) which may form through holes might pass through the stem but may not be directly visible in this posterior view.

[0100] This rear perspective highlights the posterior aspect of the tibial implant cover 200. Similar to the base component, the dimension between the tapered cover stem 220 and the posterior cover side (280) could potentially be varied in different embodiments to match corresponding base components of various sizes. The left side feature cover 275 is seen extending downwards near one lateral edge. The profile view also gives an indication of the thickness of the cover body associated with the top cover surface 210, which could be approximately one millimeter across a majority of the body. However, in some embodiments, the tibial implant cover is less than one millimeter thick over the anterior notch such that the planar surface of the top cover surface is maintained.

[0101] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4D, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the posterior aspect of the cover could incorporate alignment markings or features. The elements depicted in FIG. 4D may also be interchangeable with other elements of FIGS. 1-4C, and 4E-8 as required to realize a particularly desired embodiment.

[0102] Referring to FIG. 4E, a left view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. The embodiment depicted in this view shows the profile of the tibial implant cover 200 when observed from the left cover side (270, not labeled). Visible elements can include the profile of the top cover surface 210, the tapered cover stem 220, and potentially features along the periphery such as the cover lip 215 (typically anterior) and the left side feature cover 275.

[0103] The tapered cover stem 220 is shown in profile from the left side. Significantly, this view depicts at least two fixation apertures located on the side of the tapered cover stem 220. As illustrated, a superior stem hole 221 and an inferior stem hole 222 can be identified. Consistent embodiments described herein, these apertures (221, 222) may be configured as through holes extending through the tapered cover stem 220. Furthermore, these through holes may beconfigured to receive fixation elements, such as, but not limited to, fixation screws, potentially passing through aligned holes in a mating base stem.

[0104] Other features visible in this left-side view can include the cover lip 215, shown near the anterior aspect of the top cover surface 210, which might interact with a corresponding base lip (115). The left side feature cover 275 is also shown extending downward from the underside of the main cover body near the left side. However, in some embodiments, the left side feature cover 275 is not present. The profile illustrates the relative positions and extents of these features along the left side of the tibial implant cover 200.

[0105] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4E, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, alternative embodiments may feature different numbers or arrangements of stem holes (221, 222). The elements depicted in FIG. 4E may also be interchangeable with other elements of FIGS. 1-4D, and 4F-8 as required to realize a particularly desired embodiment.

[0106] Referring to FIG. 4F, a right view of a tibial implant cover, in accordance with various embodiments of the disclosure is shown. This view illustrates the profile of the tibial implant cover 200 when viewed from the right cover side (260, not labeled). Similar to the left-side view, visible elements can include the profile edge of the top cover surface 210, the tapered cover stem 220 extending generally downward, and peripheral features like the cover lip 215 (anteriorly located). A left side feature cover 275, is also shown extending downward on this right side, however certain embodiments may omit the left side feature cover 275.

[0107] The tapered cover stem 220 is visible in profile from the right side. As in the complementary left-side view, this perspective may reveal fixation apertures within the stem. A superior stem hole 221 and an inferior stem hole 222 are shown, representing apertures that can form through holes within the tapered cover stem 220. These through holes may be intended to align with corresponding holes in a base component such as the tibial implant base and be configured to receive fixation screws. In some embodiments, the fixation screws can be configured with a length of between twenty millimeters to sixty millimeters. In moreembodiments, a cover lip 215 near the anterior aspect of the top cover surface 210 is present, potentially for interaction with a base lip of a tibial implant base. The downwardly extending left side feature cover 275 is also visible on this right side.

[0108] Although a specific embodiment for a tibial implant cover 200 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 4F, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the left side feature cover 275 may be present on one or both sides of the implant cover or have different configurations. The elements depicted in FIG. 4F may also be interchangeable with other elements of FIGS. 1-4E and 5-8 as required to realize a particularly desired embodiment.

[0109] Referring to FIG. 5, a perspective view of a lattice tibial implant cover 500, in accordance with various embodiments of the disclosure is shown. This lattice tibial implant cover 500 may share a similar overall form factor and features with the tibial implant cover 200 depicted in FIG. 3, but is distinguished by having at least a portion of its body configured as a porous or lattice structure. In many embodiments, the lattice tibial implant cover 500 may be configured to mate with a tibial implant base. Visible general features can include an area corresponding to a top cover surface 210 (now formed by the lattice), and a tapered cover stem 220 extending generally perpendicularly upward from the underside.

[0110] In a number of embodiments, the lattice structure may comprise interconnected struts or elements that define a network of pores or voids, potentially constituting a majority of the space within the lattice region. In other words, a majority of the lattice tibial implant cover 500 may be empty space, or voids. Such a lattice structure might be manufactured from a material suitable for interfacing with bone or other soft tissue, potentially encouraging tissue ingrowth for biological fixation. The thickness of the struts or the overall lattice layer could be controlled during manufacturing.

[0111] Despite the lattice configuration of the main body surface, various embodiments of the lattice tibial implant cover 500 may retain other functional features similar to the tibial implant cover shown in FIGS. 3 and 4A-4F. The tapered cover stem 220 (which may or may not be latticed itself) can include fixation apertures, such as a superior stem hole 221 and an inferior stem hole222, configured to form through holes for receiving fixation devices such as screws and aligning with holes in a tibial implant base stem. Peripheral features like a cover lip 215 and an anterior notch 219 may also be present, potentially serving similar functions related to mating and alignment as described in other tibial implant cover embodiments.

[0112] Although a specific embodiment for a lattice tibial implant cover 500 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 5, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the lattice structure could have varying pore sizes or densities in different regions. The elements depicted in FIG. 5 may also be interchangeable with other elements of FIGS. 1-4F and 6A-8 as required to realize a particularly desired embodiment.

[0113] Referring to FIG. 6A, a lattice tibial implant cover 500 being placed on top of a tibial implant base 100, in accordance with various embodiments of the disclosure is shown. Those skilled in the art will recognize that the embodiment depicted in FIG. 6A illustrates an assembly step, showing a lattice tibial implant cover (such as lattice tibial implant cover 500 described in FIG. 5), being positioned relative to a tibial implant base 100 prior to or during the mating process, according to various embodiments. This view demonstrates how the two separate components, the tibial implant base 100 and the lattice tibial implant cover 500 may be brought together to form a combined tibial implant (300, FIG. 6B).

[0114] The relative positioning depicted in FIG. 6 A highlights the features intended for mating between the two components. Specifically, the tapered cover stem 220 of the lattice tibial implant cover 500 can be seen oriented towards the corresponding tapered base stem 120 of the tibial implant base 100. The underside of the lattice tibial implant cover 500 is shown approaching the top base surface 110. During proper mating, the tapered cover stem 520 may be received by or interact with the tapered base stem 120. This alignment is typically utilized for ensuring that fixation apertures, such as the superior stem holes (121, 521) and inferior stem holes (122, 522), align to create continuous through holes in the assembled construct.

[0115] The embodiment depicted in FIG. 6A also allows visualization of how peripheral features may interact during assembly. For instance, the cover lip 515 on the lattice tibial implant cover 500 may align with or engage the base lip 115 on the tibial implant base 100, potentiallycontributing to the secure mating of the components. Similarly, the anterior notch 219 on the lattice tibial implant cover 500 might align with corresponding features on the tibial implant base 100.

[0116] Although a specific embodiment for an assembly process depicted for lattice tibial implant cover 500 and tibial implant base 100 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 6A, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, alternative mating mechanisms between the cover and base could be employed. The elements depicted in FIG. 6 A may also be interchangeable with other elements of FIGS. 1-5 and 6B-8 as required to realize a particularly desired embodiment.

[0117] Referring to FIG. 6B, a combined tibial implant 300 comprising a lattice tibial implant cover 500 and tibial implant base 100, in accordance with various embodiments of the disclosure is shown. The embodiment depicted in FIG. 6B shows a perspective view of a combined tibial implant 300, illustrating the result of mating the lattice tibial implant cover (e.g., 500 from FIG. 5) with the tibial implant base (100). This figure represents an assembled state of the implant, consistent with various embodiments and the result of the mating process mentioned previously.

[0118] In this combined configuration, the top cover surface 510, here shown with a lattice structure, forms the superior-most surface of the implant body. The tapered cover stem 520 and the tapered base stem (120, not directly visible but implied within 520) are now mated, forming a unified combined stem structure extending generally perpendicularly from the main body. As described previously, the mating is typically such that a first through hole 621 associated with and penetrating the respective superior stem holes (e.g., 121 / 521) and a second through hole 622 associated with and penetrating the respective inferior stem holes (e.g., 122 / 522) become aligned, creating continuous through holes (621, 622) within the combined stem of the implant 300, potentially for receiving fixation screws.

[0119] The perspective view depicted in the embodiment shown in FIG. 6B also highlights the underside features of the tibial implant base 100, such as the stabilization flange width 150 and the central fixation threaded hole 155, as part of the overall combined tibial implant 300. These features may be configured for interaction with a second implant component. The peripheralshape, including aspects of the right base side 160, left base cavity 140, and right base cavity 130, defines the footprint of the assembled implant base section. The interface between the cover and base (e.g., interaction of lips 115 / 515, notch 519 with base features) can contribute to the integrity of the combined tibial implant 300.

[0120] Although a specific embodiment for a combined tibial implant 300 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 6B, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the interface between the mated cover and base could be secured by additional means beyond friction fit or stem interaction. The elements depicted in FIG. 6B may also be interchangeable with other elements of FIGS. 1-6A and 7-8 as required to realize a particularly desired embodiment.

[0121] Referring to FIG. 7, a top-down isometric view of two tibial implants (400, 450) of different sizes in accordance with various embodiments of the disclosure is shown. Specifically, the embodiment depicted in FIG. 7 presents a top-down isometric view comparing two tibial implants of potentially different sizes, designated generally as tibial implant 400 and larger-sized tibial implant 450, according to various embodiments. Each implant (400, 450) appears to represent an assembly of a tibial implant base and a tibial implant cover, specifically showing the lattice tibial implant cover configuration (consistent with the lattice tibial implant cover 500 in FIG. 5). This view serves to illustrate potential variations in implant dimensions within the disclosed system.

[0122] Both tibial implant 400 and larger-sized tibial implant 450 display similar features from this perspective, differing primarily in apparent anterior-posterior length. Visible features on both may include the top cover surface (configured as a lattice), the tapered cover stem, aspects of the underlying tibial implant base including the right base side, the right base cavity, the left base cavity, the stabilization flange width area, and the central fixation threaded hole. These features correspond generally to those described in the individual component views and the combined view of FIG. 6B.

[0123] The comparison between tibial implant 400 and larger-sized tibial implant 450 in FIG.7 may illustrate the implementation of variable sizing, which is desired based on the needs ofdiffering patients and anatomy. Specifically, the difference in anterior-posterior dimension could be achieved by extending the portion of the tibial implant base and the corresponding tibial implant cover in the area between the respective tapered stems and the posterior sides. As a result, by matching one or more extensions, implants of various sizes can be realized. This can allow for the provision of implants matched to different patient anatomies or surgical requirements. Additionally, a specific dimension designated as tibial implant depth gap 410 is indicated on tibial implant 400, representing a difference measurement highlighting the general shape of enlarged tibial implants.

[0124] Although specific embodiments for tibial implant embodiments 400 and 450 for carrying out the various steps, processes, methods, and operations described herein are discussed with respect to FIG. 7, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, implants could be offered in a wider range of sizes or with different sizing increments beyond those depicted based on the anatomies to be operated on. The elements depicted in FIG. 7 may also be interchangeable with other elements of FIGS. 1-6B and 8 as required to realize a particularly desired embodiment.

[0125] Referring to FIG. 8, a dual perspective view of a combined tibial implant 300 in accordance with various embodiments of the disclosure is shown. As those skilled in the art will recognize, the view depicted in this embodiment can advantageously display multiple aspects of the combined implant 300 simultaneously, including superior, anterior, lateral, and inferior features, providing a holistic understanding of the assembled construct. From this perspective, the superior aspect of the combined tibial implant 300 is clearly visible, showcasing the top cover surface 210. The tapered cover stem 220 can be seen extending generally upward from the top cover surface 210, representing the superior portion of the combined stem formed by the mating of the tapered cover stem 220 and the underlying base stem (120). The internal stem holes (e.g., 121 / 221, 122 / 222) are shown in this external view, indicating a combined stem structure where such aligned through holes can be configured to potentially receive fixation screws or other components.

[0126] The anterior and lateral aspects of the combined tibial implant 300 are also discernible in the embodiment depicted in FIG. 8. In many embodiments, the profiles corresponding to theleft base side 170 and right base side 160 are partially visible, contributing to the overall footprint definition. Features such as the left base cavity 140 and right base cavity 130 can be observed near the anterior aspect, potentially illustrating their configuration which may be suitable for interaction with positioning or targeting devices during surgical implantation as previously mentioned above. The anterior area is shown to comprise features like the cover lip and base lip extending upward along the perimeter of the top base surface 110 which might interact, and where the anterior notch could mate with one or more features on the base.

[0127] Furthermore, FIG. 8 provides visibility of certain underside features of the tibial implant base section integrated into the combined tibial implant 300. For example, the area corresponding to the stabilization flange width 150, including the individual stabilization flanges (151, 152, implied within 150), are shown extending from the underside. The central fixation threaded hole 155 located within this structure is also present and ready to be utilized when configured with an additional portion of a fixation threaded hole, perhaps on an additional tibial implant component. These underside features are significant as they may be configured to mate or interlock with features on a second implant component, providing stability and alignment for the overall joint replacement assembly.

[0128] In additional embodiments, the embodiment depicted in FIG. 8 shows how the top cover surface 210 sits upon the base, how the combined stem projects from the body, and how the underside fixation and stabilization features (150, 155) are positioned relative to the main body and periphery. This integrated view helps visualize how variations in proportions, such as the extension between the stem and the posterior side, could result in different overall implant sizes while maintaining the core structural relationships.

[0129] Although a specific embodiment for a combined tibial implant 300 for carrying out the various steps, processes, methods, and operations described herein is discussed with respect to FIG. 8, any of a variety of systems and / or devices may be utilized in accordance with embodiments of the disclosure. For example, the relative dimensions or angles of the stem and base could be modified in alternative designs. The elements depicted in FIG. 8 may also be interchangeable with other elements of FIGS. 1-7 as required to realize a particularly desired embodiment.

[0130] Although the present disclosure has been described in certain specific aspects, many additional modifications and variations would be apparent to those skilled in the art. In particular, any of the various processes described above can be performed in alternative sequences and / or in parallel in order to achieve similar results in a manner that is more appropriate to the requirements of a specific application. It is therefore to be understood that the present disclosure can be practiced other than specifically described without departing from the scope and spirit of the present disclosure. Thus, embodiments of the present disclosure should be considered in all respects as illustrative and not restrictive. It will be evident to the person skilled in the art to freely combine several or all of the embodiments discussed here as deemed suitable for a specific application of the disclosure. Throughout this disclosure, terms like “advantageous”, “exemplary” or “example” indicate elements or dimensions which are particularly suitable (but not essential) to the disclosure or an embodiment thereof and may be modified wherever deemed suitable by the skilled person, except where expressly required. Accordingly, the scope of the disclosure should be determined not by the embodiments illustrated, but by the appended claims and their equivalents.

[0131] Any reference to an element being made in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more.” All structural and functional equivalents to the elements of the above-described preferred embodiment and additional embodiments as regarded by those of ordinary skill in the art are hereby expressly incorporated by reference and are intended to be encompassed by the present claims.

[0132] Moreover, no requirement exists for a system or method to address each and every problem sought to be resolved by the present disclosure, for solutions to such problems to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. Various changes and modifications in form, material, workpiece, and fabrication material detail can be made, without departing from the spirit and scope of the present disclosure, as set forth in the appended claims, as might be apparent to those of ordinary skill in the art, are also encompassed by the present disclosure.

Claims

CLAIMSWhat is claimed is:

1. A tibial implant, comprising: a tibial implant base, comprising: a body with a top base surface; a tapered base stem extending in a generally perpendicular direction from the top base surface; and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered base stem; and a tibial implant cover, comprising: a body with a top cover surface; a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem; and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered cover stem; wherein the tibial implant cover is configured to mate with the tibial implant base such that at least the two through holes created through the tapered base stem and the at least two through holes created through the tapered cover stem are aligned to create at least two through holes through the tibial implant.

2. The tibial implant of claim 1, wherein the at least two through holes are configured to receive at least two fixation screws.

3. The tibial implant of claim 1, wherein the tibial implant base further comprises: a central fixation threaded hole; and a raised notch corresponding to the threaded hole extending on the top base surface.

4. The tibial implant of claim 3, wherein the tibial implant cover further comprises an anterior notch, wherein the anterior notch is configured to mate with the raised notch of the top base surface.

5. The tibial implant of claim 4, wherein the anterior notch extends from an anterior cover side to the anterior side of the tapered cover stem.

6. The tibial implant of claim 1, wherein the tibial implant base further comprises a pair of stabilization flanges configured on an anterior base side.

7. The tibial implant of claim 6, wherein the pair of stabilization flanges are configured to mate with at least one protrusion from a second implant component.

8. The tibial implant of claim 1, wherein the tibial cover is configured in a lattice structure.

9. The tibial implant of claim 8, wherein the lattice structure is configured with a material suitable for interfacing with bone.

10. The tibial implant of claim 8, wherein the lattice structure is configured such that a majority of space associated with the lattice structure is a void.

11. The tibial implant of claim 1 , wherein the tibial base implant further comprises: a left base cavity on an anterior side; and a right base cavity on the anterior side; wherein the left base cavity and right base cavity are configured for use by one or more targeting devices for positioning.

12. The tibial implant of claim 1, wherein: a portion of the tibial implant base can be extended along the body in an area between the tapered base stem and posterior base side; andthe portion of the tibial cover base can be extended along the body in the area between the tapered cover stem and posterior cover side; wherein one or more extensions are matched to allow for implants of various sizes.

13. A tibial implant, comprising: a tibial implant base, comprising: a body with a top base surface; a tapered base stem extending in a generally perpendicular direction from the top base surface; and a base lip extending upward along a perimeter of the top base surface; and a tibial implant cover, comprising: a body with a top cover surface dimensioned similarly to the top base surface; a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem; and a cover lip extending along the perimeter of the top cover surface; wherein the tibial implant cover is configured to mate with the tibial implant base through at least an interaction between the base lip and the cover lip.

14. The tibial implant of claim 13, wherein the tibial implant base further comprises: a central fixation threaded hole; and a raised notch corresponding to the threaded hole extending on the top base surface.

15. The tibial implant of claim 14, wherein the tibial implant cover further comprises an anterior notch, wherein the anterior notch is configured to mate with the raised notch of the top base surface.

16. A method of producing a tibial implant, the method comprising: manufacturing a tibial implant base, wherein the tibial implant base comprises at least: a body with a top base surface;a tapered base stem extending in a generally perpendicular direction from the top base surface; and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered base stem; manufacturing a tibial implant cover wherein the tibial implant base comprises at least: a body with a top cover surface; a tapered cover stem extending in a generally perpendicular direction from the top base surface, wherein the tapered cover stem is dimensioned to mate with the tapered base stem; and at least two fixation apertures on at least two sides of the tapered base stem such that at least two through holes are created through the tapered cover stem; and mating the tibial implant cover to the tibial implant base such that at least the two through holes created through the tapered base stem and the at least two through holes created through the tapered cover stem are aligned to create at least two through holes through the tibial implant.

17. The method of claim 16, wherein the at least two through holes are configured to receive at least two fixation screws.

18. The method of claim 17, wherein the two fixation screws are configured between twenty millimeters to sixty millimeters in length.

19. The method of claim 16, wherein a thickness of the tibial implant cover is one millimeter across a majority of the body.

20. The method of claim 16, wherein the tibial implant cover further includes an anterior notch and a thickness of the tibial implant cover is less than one millimeter over the anterior notch such that a planar surface of the top cover surface is maintained.

Images