47 results about "Posterior condyle" patented technology

A method for setting the internal-external rotational position of a prosthetic femoral component with respect to the tibial comprising: forming a cylindrical surface on the posterior femoral condyles, said cylindrical surface formed about an axis extending in a proximal distal direction with respect to the femur; placing a template having a cylindrical guide surface for engaging said posterior femoral condyles against a planar resected surface of the distal femur with said guide surfaces in contact with said cylindrically shaped posterior condyles; and rotating said template on said cylindrical guide surface as the knee joint is moved from flexion to extension until the template cylindrical guide surfaces are in a position with respect to the tibial condyle surfaces to properly balance the knee ligaments.

Systems and methods for providing deeper knee flexion capabilities, more physiologic load bearing and improved patellar tracking for knee prosthesis patients. Such systems and methods include (i) adding more articular surface to the antero-proximal posterior condyles of a femoral component, including methods to achieve that result, (ii) modifications to the internal geometry of the femoral component and the associated femoral bone cuts with methods of implantation, (iii) asymmetrical tibial components that have an unique articular surface that allows for deeper knee flexion than has previously been available, (iv) asymmetrical femoral condyles that result in more physiologic loading of the joint and improved patellar tracking and (v) modifying an articulation surface of the tibial component to include an articulation feature whereby the articulation pathway of the femoral component is directed or guided by articulation feature.

Systems and methods for providing deeper knee flexion capabilities, more physiologic load bearing and improved patellar tracking for knee prosthesis patients. Such systems and methods include (i) adding more articular surface to the antero-proximal posterior condyles of a femoral component, including methods to achieve that result, (ii) modifications to the internal geometry of the femoral component and the associated femoral bone cuts with methods of implantation, (iii) asymmetrical tibial components that have an unique articular surface that allows for deeper knee flexion than has previously been available and (iv) asymmetrical femoral condyles that result in more physiologic loading of the joint and improved patellar tracking.

Embodiments of the present invention allow unlimited rotational alignment between two boundaries for alignment with anatomic landmarks while still referencing both posterior condyles for A / P sizing of the distal femur. In particular embodiments, the system provides at least one movable paddle that provides a reference point from the condyles so that the measuring assembly can be aligned to be parallel with the epicondylar axis. Once the measuring assembly is properly angled, the A / P length of the bone can then be measured from a proper reference point.

A dynamic trialing method generally allows a surgeon to perform a preliminary bone resection on the distal femur according to a curved or planar resection profile. With the curved resection profile, the distal-posterior femoral condyles may act as a femoral trial component after the preliminary bone resection. This may eliminate the need for a separate femoral trial component, reducing the cost and complexity of surgery. With the planar resection profile, shims or skid-like inserts that correlate to the distal-posterior condyles of the final insert may be attached to the distal femur after the preliminary bone resection to facilitate intraoperative trialing. The method and related components may also provide the ability of a surgeon to perform iterative intraoperative kinematic analysis and gap balancing, providing the surgeon the ability to perform necessary ligament and / or other soft tissue releases and fine tune the final implant positions based on data acquired during the surgery.

Methods for forming prosthetic implants, including femoral implants, are discussed. While the methods can include any suitable step, in some cases, they include providing a master negative mold defining an internal space shaped to form a femoral component configured to replace a distal portion of a femur, wherein the femoral component comprises at least one of: an anterior flange that is disposed at an anterior proximal end of the femoral component, and a proximal extension disposed at a proximal portion of a posterior condyle of the femoral component, the proximal extension comprising a concave articulation surface that is configured to articulate against at least one of: a tibial prosthetic component and a tibia; filling the master negative mold with a molding material to form a molded femoral component; and removing at least one of: the anterior flange, and the proximal extension from the molded femoral component to form a modified molded femoral component. Other implementations are described.

The invention discloses a medial femoral single condyle prosthesis (201), a lateral femoral single condyle prosthesis (301), and a femoral trochlea prosthesis (401). The medial femoral single condyle prosthesis comprises an articular surface which is a surface making contact with the medial patella and the medial tibial plateau during the knee joint motion process, wherein the articular surface is presented as a segmental arc (203) on a first ellipse (38) on the sagittal position, and is presented as a segmental arc (95) on a first circle (94) on a coronal position; and an inside surface, which is the part adjoining femoral condyle cut bone surface and bone cement after prosthesis implantation, and is presented as a medial posterior condyle (202) with a straight line section and a medial distal end (209) consistent with the segmental arc (203). The prosthesis can be closer to the geometric shape of the normal human femoral condyle, and design parameter values of femoral prostheses of various types are simplified.

The invention discloses a distal femur and anterior and posterior condyle measuring and positioning osteotomy device for knee joint replacement. The device comprises a tibial osteotomy surface guide plate, a thighbone posterior condyle osteotomy guide plate, a thighbone anterior condyle osteotomy guide plate, connecting screws and a measuring probe, wherein the tibial osteotomy surface guide plate is provided with a thighbone posterior condyle osteotomy guide plate clamping groove connected with a thighbone posterior condyle osteotomy guide plate clamping strip; the thighbone posterior condyle osteotomy guide plate is provided with a measuring probe insertion hole connected with a measuring probe insertion rod; the thighbone posterior condyle osteotomy guide plate is provided with thighbone anterior condyle osteotomy guide plate insertion openings connected with a thighbone anterior condyle osteotomy guide plate insertion plate; thighbone posterior condyle osteotomy guide plate connection holes are connected with thighbone anterior condyle osteotomy guide plate insertion plate screw holes through the connecting screws; thighbone posterior condyle osteotomy guide plate fixing nails pass through fixing nail holes in the thighbone posterior condyle osteotomy guide plate to fix the thighbone posterior condyle osteotomy guide plate to thighbones. By means of the technology, operative injuries are remarkably reduced, a femoral prosthesis is positioned accurately, the operative process is simple, and operative cost is lowered.

The invention discloses a knee joint thighbone posterior condyle point identification method and system based on a motion simulation algorithm. The method comprises the steps of determining coordinates of a medullary cavity center point of each fault layer in a two-dimensional CT image of a knee joint thighbone based on an image identification technology; fitting a medullary cavity axis according to the coordinates of the medullary cavity center points of all the fault layers; performing three-dimensional reconstruction on the two-dimensional CT image to obtain a three-dimensional model of the femur; performing three-dimensional graphic transformation on the axis of the medullary cavity in the three-dimensional model to enable the axis of the medullary cavity to be perpendicular to the horizontal plane; obtaining a perspective image of one end of the femur according to the three-dimensional model; based on the perspective image, rotating the femur by taking the axis of the medullary cavity as the center, so that the longitudinal coordinates of the posterior condyle points on the two sides of the femur are the same; and restoring the bilateral posterior condyle points of the thighbone in the perspective image to the three-dimensional model to obtain three-dimensional coordinates of the bilateral posterior condyle points of the thighbone of the knee joint. The knee joint thighbone posterior condyle point can be accurately positioned.

A femoral posterior condyle osteophyte removing device comprises a posterior condyle osteotomy plate, a posterior condyle osteophyte removing guide plate and a posterior condyle osteophyte removing arc-shaped osteotome. The posterior condyle osteotomy plate comprises a posterior condyle fixing plate and a posterior condyle limiting plate which are perpendicular to each other, a through hole for observing fitting condition of the posterior condyle fixing plate with femur is formed in the middle of the posterior condyle fixing plate to serve as a first observation window, the posterior condyle fixing plate is provided with multiple first nail holes convenient for fixing the posterior condyle fixing plate onto the femur on two sides of the first observation window, two osteotomy sawblade guide grooves parallel to the posterior condyle limiting plate are formed in a position, close to the posterior condyle limiting plate, of the posterior condyle fixing plate and arranged on two sides of the femur symmetrically by taking the femur as a center, a gap is reserved between the osteotomy sawblade guide grooves, and each osteotomy sawblade guide groove is a through groove. By the device, interference of posterior condyle osteophyte on straightening gap judgment is avoided, balance of straightening position in knee joint replacement is ensured, balance accuracy is improved, suffering of apatient is relieved, and effect of knee joint replacement surgery is ensured.

A two-piece total knee rotation guide and femoral sizer system including a guide that assesses the rotation needed based on the posterior condyles of the femur, and a guide for sizing the femur in the anteroposterior (“AP”) dimension.

The invention relates to a femoral condyle AP measurer. The femoral condyle AP measurer can accurately measure the sizes of the anterior condyle and the posterior condyle of femur, limit the osteotomy size and assist in positioning of an osteotomy plate.

A femoral sizing instrument for use in a knee joint replacement procedure has a housing which includes formations by which it can be located relative to the femoral posterior condyles. A cortex arm has a tip for engaging the anterior cortex of the femur and a sulcus arm has a tip for engaging the sulcus. Each of the cortex and sulcus arms can be adjusted relative to the housing to adjust the distance between its tip and the posterior condyles measured generally parallel to the anterior posterior axis. The instrument includes at least one scale for indicating the positions of the tips of the cortex and sulcus arms relative to the posterior condyles.

A jig (1) for determining a patient-adapted implant size of the femoral implant of a knee endoprosthesis is disclosed, wherein the jig (1) has the following: a main body (2, 4), a probe part (7) movable relative to the main body (2, 4) along a measuring direction (6), wherein the probe part (7) has a probe arm (8) with a probe tip (9) for placing on an anterior reference point of the distal end of the patient's femur, two contact pieces (11, 12) for respectively placing on and referencing the medial and the lateral posterior condyle of the distal end of the patient's femur, and at least one scale (23, 24) and an associated pointer (21, 22) for indicating a position of the probe part (7) in the measuring direction (6) relative to at least one of the contact pieces (11, 12) for defining a suitable implant size. In order to avoid measurement errors of the kind that occur particularly when simultaneously defining the external implant angle using known jigs, the invention proposes that the contact pieces (11, 12) are movable relative to the main body (2, 4) in such a way that a distance, projected in the measuring direction (6), of the probe tip (9) from the contact pieces (11, 12) is adjustable for the contact pieces (11, 12) in such a way that this distance is different with respect to the two contact pieces (11, 12), and such that, for each contact piece (11, 12), a dedicated scale (23, 24) and an associated pointer (21, 22) are provided for the indication of a position of the probe part (7) in the measuring direction (6) relative to the respective contact piece (11, 12) and for the resulting indication of a suitable implant size.

The invention discloses an assembly-adjustable four-in-one osteotomy plate which comprises a four-in-one osteotomy plate main body and anterior and posterior condyle osteotomy blocks, the four-in-one osteotomy plate is designed to be of a split structure, a knee joint knee bending gap can be measured through a posterior condyle plane and a tibial plateau plane before osteotomy, the anterior condyle osteotomy amount of the femoral condyle of a knee joint can be measured through an anterior condyle plane, and the situation that the prosthesis is not stably fixed due to anterior condyle Notch appearance or insufficient osteotomy is avoided; two positioning columns are designed on the four-in-one osteotomy plate main body, and the up-down position of the four-in-one osteotomy plate main body is adjusted according to the measured knee bending gap of the knee joint and the osteotomy amount of the femoral condyle and the anterior condyle of the knee joint, so that the four-in-one osteotomy plate main body reaches the optimal osteotomy position and selects the optimal specification; and the four-in-one osteotomy plate main body is provided with a taking-out structure, so that a doctor can conveniently and quickly take down the four-side osteotomy plate main body in an operation, the operation time is shortened, infection is reduced, resection of bone mass caused by poor matching is avoided, and damage to a soft tissue balance system is reduced.

The invention relates to a preartis-matching femoral prosthesis for an artificial knee joint. The preartis-matching femoral prosthesis comprises an internal condyle, an external condyle, an anterior wing, a pulley and a posterior condyle. The anterior wing is formed by extending inwardly from front ends of the internal condyle and the external condyle to be connected with the pulley. The posterior condyle is formed in such a manner that the internal condyle and the external condyle extend inwardly and connected. An intercondylar fossa is defined between the internal condyle and the external condyle. The thickness of the anterior wing is in negative relationship with front and back diameters of the anterior wing and the posterior condyle.The preartis-matching femoral prosthesis for the artificial knee joint has following beneficial effects: the thickness of the anterior wing is on decrease step by step along with the increase of the front and back diameters of the prosthesis so that characteristics of the femoral anatomy are obtained; mechanical properties of patellofemoral joints are improved and excessive filling or insufficient filing in front of femurs are overcome; complications such as anterior knee pains and obstacles for joint range of motion are reduced; and postsurgical clinic effect is raised.

The invention belongs to the technical field of anatomical steel plates, and discloses a Hoffa anatomical steel plate. A condyle side wing is integrally arranged at the lower end of a femoral stem, and a posterior condyle blocking wing is integrally arranged on the outer side of the femoral stem; and a plurality of locking screw holes are formed in the femoral stem, the condyle side wing and the posterior condyle blocking wing. The femoral stem and the condyle side wing are arc-shaped. The direction of the locking screw holes in the femoral stem is perpendicular to the axis of a femoral shaft,a certain inclination angle is formed between the locking screw holes in the posterior condyle blocking wing and a wing face, the outer row of locking screw holes in the condyle side wing are perpendicular to the condyle sagittal plane, and a certain angle is formed between the inner row of locking screw holes and the condyle sagittal plane. The condyle blocking wing resists shearing force towards the rear upper portion, the femoral stem and the condyle side wing gather the fractured femoral condyle into a whole to be supported and fixed, and the front end of the condyle side wing at least exceeds two screw holes in the fracture surface in the fixing process. On the premise that the articular surface is not damaged, the Hoffa fracture is reliably reset and fixed, and possible fracture redisplacement can be prevented.

The invention discloses a knee joint bone surface replacement device. The knee joint bone surface replacement device comprises a detector, wherein a bone cutting device is arranged on the detector, and a measurer is arranged on the bone cutting device. The knee joint bone surface replacement device is simple in structure and high in accuracy rate, a posterior condyle plate is additionally arranged on the detector on the existing basis, so that a gap detector can be clamped in a gap between the tibia and the femur in a more fitting manner, a straightening gap corresponds to a flexion gap obtained through the bone cutting device, so that the shaking of the femur is avoided, and the accuracy of the femur cutting is improved; other bone cutting devices with different sizes are saved, the cutting operation of the femurs with different sizes can be realized, and the operation efficiency is improved; a moving body at the top of the existing bone cutting device is separated and is combined with a pointer, the sizes of the front diameter and the rear diameter of the femur are measured through the pointer, and meanwhile, the position of the moving body is adjusted, so that the size of the femur cut by a first section on the moving body is completely matched with an artificial joint prosthesis, and the operation success rate and the operation efficiency are improved.

The invention provides an adjuster for joint replacement and a use method of the adjuster. The adjuster for joint replacement comprises a body, wherein at least one pair of datum holes and multiple pairs of adjusting holes are formed in the body, and the paired datum holes can be simultaneously attached to and sleeve fastening nails to be adjusted due to interval setting of the paired datum holes; a pair of adjusting holes whose center connecting line forms the minimum angle difference with a center connecting line of the paired datum holes is set, and the maximum angle difference between the center connecting line of the adjusting holes and the center connecting line of the paired datum holes is 2 degrees; the maximum angle difference between center connecting lines, having the most similar inclination degree, of two pairs of adjusting holes is 2 degrees. Compared with human eye estimation in the prior art, the adjuster is easier to master and can control the error within 2 degrees; the adjusted two fastening nails are taken as a basis, a front tangent plane and a rear tangent plane can be effectively controlled to be basically parallel to the epicondylar axis, improper external rotation osteotomy of anterior and posterior condyle of thighbones is avoided, accurate osteotomy is realized, and the clinical efficacy is improved.