Knee joint unicompartmental prosthesis and method of installation thereof

Abstract

This disclosure provides a unicompartmental knee prosthesis structure and its installation method, including a fixation platform. A fixation surface is formed at the bottom of the fixation platform, and several fixation protrusions are provided on the fixation surface. The fixation surface forms a surface contact support with the tibial end, and the fixation protrusions cooperate with pre-set oblique holes on the tibial end to achieve positioning connection. The axis of the fixation protrusion is inclined relative to the normal direction of the fixation surface to form a pre-set angle. The fixation protrusion can be inserted into the tibial end along the extension direction of the pre-set oblique holes. After the fixation surface abuts against the tibial end, it forms an inclined embedded fixation structure. This facilitates installation with a small gap between the tibial and femoral ends, and improves the connection stability and anti-loosening ability between the fixation platform and the tibial end. The cooperation between the fixation protrusions and the pre-set oblique holes can disperse the local load transmitted from the fixation platform to the tibial end, reduce stress concentration in the installation area of ​​the tibial end, and reduce the risk of cracks, splits, or fractures in the tibial end.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and more specifically, to a unicompartmental knee joint prosthesis structure and its installation method. Background Technology

[0002] A unicompartmental knee prosthesis is an implantable prosthetic structure used for localized functional reconstruction of the knee joint, typically replacing and supporting the localized load-bearing area at the tibial end. Current unicompartmental knee prostheses generally include a fixation platform for abutting against the tibial end. This platform connects to the tibial end via fixation posts, fixation protrusions, sliding joint structures, or bone cement to achieve positioning and fixation of the prosthesis on the tibial end. By preserving part of the original joint structure and replacing only the affected area, unicompartmental prostheses, compared to total knee prostheses, have a relatively compact structure, preserve more bone volume, and offer better motion matching, thus enjoying widespread application in the field of joint prostheses. With advancements in material processing technology and prosthesis structural design, unicompartmental prostheses have gradually evolved from simply meeting connection and fixation requirements to considering structural stability, motion matching, and fit compatibility.

[0003] The existing structure and installation process of unicompartmental knee prostheses usually require cutting grooves, stepped grooves, or installation areas with right-angled intersections directly into the tibial end in order to make the fixation platform fit with the tibial end. For example, the application of the vertical plate in the patent application with publication number CN120458779A requires splitting the tibia in two, which makes the stress on the tibia more concentrated when bearing the load transmitted by the prosthesis, increasing the risk of cracks, splits, or even fractures at the tibial end.

[0004] Therefore, there is a need to provide a unicompartmental knee prosthesis structure and its installation method to solve the problem that the existing knee prosthesis structure and installation can easily lead to stress concentration at the tibial end, thereby increasing the risk of tibial end cracks, splits or fractures. Summary of the Invention

[0005] The main objective of this disclosure is to provide a unicompartmental knee prosthesis structure and its installation method, aiming to solve the technical problems mentioned in the background art.

[0006] The present invention adopts the following technical solution: A unicompartmental knee prosthesis structure includes a fixation platform, the bottom end of which forms a fixation surface. The fixation surface is provided with a plurality of fixation protrusions, which extend in a direction away from the fixation surface. The axes of the plurality of fixation protrusions are inclined relative to the normal direction of the fixation surface, forming a preset angle between the fixation protrusions and the fixation platform. The fixation protrusions are used to be pushed into a preset oblique hole at the tibial end so that the fixation surface abuts against the tibial end.

[0007] Furthermore, the fixing protrusion is tapered and gradually tapers away from the fixing surface. There are two fixing protrusions, which are spaced apart along the length or width of the fixing platform, and the axes of the two fixing protrusions are parallel.

[0008] Furthermore, the projection of the axis of the fixed protrusion onto the fixed surface extends along the length direction of the fixed platform.

[0009] Furthermore, a plurality of convex lobes are formed on the outer periphery of the fixed protrusion, and the plurality of convex lobes are arranged in a circular array around the axis of the fixed protrusion, and the convex lobes extend to the fixed surface along the end of the fixed protrusion away from the fixed surface.

[0010] Furthermore, the outer periphery of the fixed protrusion includes three lobes, and a circular protrusion is formed on the side of the lobes away from the fixed protrusion. The circular protrusion extends along the end of the fixed protrusion away from the fixed surface to the fixed surface, so that the cross-section of the fixed protrusion is clover-shaped.

[0011] Furthermore, the ratio of the cross-sectional area of ​​the fixed protrusion near the fixed surface to the cross-sectional area of ​​the fixed protrusion away from the fixed surface is 1.5~2.5:1, and the preset included angle is 10°~45°.

[0012] Furthermore, one side of the fixed platform extends upward to form an abutment portion, the upper end surface of the abutment portion protrudes from the upper end surface of the fixed platform, one side of the pad abuts against the side of the abutment portion, and a rounded transition portion is formed at the junction of the abutment portion and the fixed surface.

[0013] Furthermore, the fixing platform is prepared from one of polyetheretherketone, carbon fiber reinforced polyetheretherketone, or polyetherketoneketone.

[0014] The present invention also provides a method for installing a unicompartmental knee prosthesis structure, employing the unicompartmental knee prosthesis structure as described in any of the preceding claims, comprising: A fixation platform and a tibial end are provided. The bottom end of the fixation platform forms a fixation surface. The fixation surface is provided with a plurality of fixation protrusions. The fixation protrusions extend in a direction away from the fixation surface. The axes of the plurality of fixation protrusions are inclined relative to the normal direction of the fixation surface. A preset angle is formed between the fixation protrusions and the fixation platform. The upper end surface of the tibial end forms two support portions. Based on the dimensions of the fixed surface, an initial hole is machined on one of the support parts. Using the initial hole as the cutting termination area, the support part with the initial hole is cut to form the mounting part. Drill holes in the mounting section according to the preset angle to form a preset oblique hole; A measured amount of bone cement is injected into the pre-designed oblique holes; The fixing protrusion is pushed into the preset inclined hole along the extension direction of the preset inclined hole, so that the fixing surface abuts against the mounting part. The diffusion of bone cement to the fixing surface is restricted by controlling the amount of bone cement injected.

[0015] Furthermore, one side of the fixed platform extends upward to form an abutment portion, and a rounded transition portion is formed at the junction of the abutment portion and the fixed surface; The steps include machining an initial hole in one of the support portions according to the dimensions of the fixed surface, using the initial hole as the cutting termination area, and cutting the support portion with the initial hole to form the mounting portion, including: Based on the dimensions of the fixed surface, and according to the radius of the fillet transition, an initial hole corresponding to the fillet transition is machined on one of the support parts; The support portion with the initial hole is cut sequentially along the first and second directions to form a horizontal bearing surface and a vertical abutment surface, so that the initial hole forms a tibial rounded corner surface after cutting; The cutting path for cutting the support portion with the initial hole is tangent to the initial hole, and the first direction is perpendicular to the second direction.

[0016] Furthermore, the fixing surface is coated with a biological coating; The step of bringing the fixing surface into contact with the mounting part includes: The fixing surface is abutted against the horizontal bearing surface along the second direction, the abutting part is abutted against the vertical abutting surface along the first direction, and the rounded transition part is fitted with the rounded corner surface of the tibia.

[0017] Beneficial effects: 1. In this invention, a fixing surface is formed at the bottom of the fixing platform, and several fixing protrusions are provided on the fixing surface. This allows the fixing platform to form surface contact support with the tibial end through the fixing surface. Simultaneously, the fixing protrusions engage with pre-set oblique holes on the tibial end to achieve positioning and connection. The axis of the fixing protrusion is inclined relative to the normal direction of the fixing surface, forming a pre-set angle. The fixing protrusion can be inserted into the tibial end along the extension direction of the pre-set oblique holes, forming an inclined embedded fixing structure after the fixing surface abuts against the tibial end. This facilitates installation with a small gap between the tibial and femoral ends, and improves the connection stability and anti-loosening ability between the fixing platform and the tibial end. Furthermore, the engagement of the fixing protrusions with the pre-set oblique holes can disperse the local load transmitted from the fixing platform to the tibial end, reducing stress concentration in the tibial end installation area and lowering the risk of cracks, splits, or fractures in the tibial end.

[0018] 2. An abutment part is provided on one side of the fixed platform, and a rounded transition part is formed at the junction of the abutment part and the fixed surface. At the same time, a tibial rounded surface is formed on the mounting part, so that the fixed surface, the rounded transition part and the abutment part can fit and cooperate with the horizontal bearing surface, the tibial rounded surface and the vertical abutment surface respectively, thereby reducing local stress concentration and reducing the risk of tibial end cracks, splits or fractures.

[0019] 3. Apply a biological coating to the fixation surface and apply bone cement to the outer peripheral surface of the fixation protrusion and / or the pre-set oblique hole, so that the fixation protrusion and the pre-set oblique hole are initially fixed by bone cement. The fixation surface can further form a biological fit with the tibial end through the biological coating to achieve stable long-term fixation.

[0020] 4. The fixed platform is made of materials such as polyetheretherketone, carbon fiber reinforced polyetheretherketone, or polyetherketoneketone. It can be injection molded as a whole material. Compared with the step-by-step machining method, it can effectively reduce the processing steps, improve the molding consistency and production efficiency, and at the same time help to ensure the dimensional stability of complex structures such as the tilt angle of the fixed protrusion and the rounded transition part. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a unicompartmental knee prosthesis according to the present invention; Figure 2 This is a partial structural schematic diagram of the fixing protrusion of the present invention; Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 4 This is a side view of an embodiment of the present invention. Figure 5 This is a schematic diagram of the overall structure of a unicompartmental knee joint prosthesis structure from another direction according to the present invention; Figure 6 This is a partial schematic diagram of an embodiment of the present invention; Figure 7 This is an installation diagram illustrating the installation method of a unicompartmental knee prosthesis structure according to the present invention. in: 1. Fixed platform; 11. Fixed surface; 12. Fixed protrusion; 13. Protruding flap; 14. Circular protrusion; 15. Abutment part; 16. Rounded transition part; 2. Pad; 21. First arc surface; 3. Femoral prosthesis; 31. Second arc surface; 32. Connecting surface; 33. Columnar protrusion; 34. Guide rounded corner; 4. Support part; 5. Horizontal bearing surface; 6. Vertical abutment surface; 7. Tibial rounded corner surface.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Reference Figures 1 to 6This invention proposes a unicompartmental knee prosthesis structure, including a fixation platform 1. The bottom end of the fixation platform 1 forms a fixation surface 11. The fixation surface 11 is provided with a plurality of fixation protrusions 12. The fixation protrusions 12 extend in a direction away from the fixation surface 11. The axes of the plurality of fixation protrusions 12 are inclined relative to the normal direction of the fixation surface 11, forming a preset angle between the fixation protrusions 12 and the fixation platform 1. The fixation protrusions 12 are used to be pushed into a preset oblique hole at the tibial end so that the fixation surface 11 abuts against the tibial end.

[0028] In the above embodiments, the unicompartmental knee prosthesis structure includes a fixation platform 1. As a complement to the additional structure, a pad 2 and a femoral prosthesis 3 can be further provided. The fixation platform 1 is a plate-shaped structure adapted to the local bearing area of ​​the tibial end. The upper surface of the fixation platform 1 forms a bearing area for supporting the pad 2. The bearing area can be a plane, or it can be provided with a slight chamfer or rounded corner at the edge to reduce local interference between the edge of the pad 2 and the fixation platform 1.

[0029] The pad 2 is disposed on the upper end face of the fixed platform 1, and the lower end face of the pad 2 is in contact with the upper end face of the fixed platform 1. The upper end face of the pad 2 is concave inward to form a first arcuate surface 21. The first arcuate surface 21 extends along the length direction of the fixed platform 1, and the middle part of the first arcuate surface 21 is lower than the two side edges, so that it forms a concave arcuate bearing surface with a certain degree of containment. The femoral prosthesis 3 is located above the pad 2. The femoral prosthesis 3 protrudes towards the pad 2 to form a second arcuate surface 31. The second arcuate surface 31 can be set as an outwardly convex arcuate surface corresponding to the first arcuate surface 21. The first arcuate surface 21 and the second arcuate surface 31 form a sliding fit relationship of surface contact or near-surface contact. Through the arcuate fit structure, the load applied by the femoral prosthesis 3 to the pad 2 can be gradually transitioned along the first arcuate surface 21, avoiding the load concentration at a single edge position of the pad 2; at the same time, the concave shape of the first arcuate surface 21 can also guide the sliding range of the second arcuate surface 31, making the relative movement between the femoral prosthesis 3 and the pad 2 more stable.

[0030] One side of the fixed platform 1 can also extend to form an abutment portion 15. The upper end surface of the abutment portion 15 is higher than the upper end surface of the fixed platform 1. One side of the pad 2 abuts against the side of the abutment portion 15, so that the pad 2 has a clear lateral positioning reference on the fixed platform 1. The abutment portion 15 and the fixed surface 11 can be connected by a rounded transition portion 16 to improve the structural continuity of the edge area of ​​the fixed platform 1.

[0031] The bottom end of the fixing platform 1 forms a fixing surface 11, which is used to form an abutment support with the tibia. The fixing surface 11 is provided with a plurality of fixing protrusions 12. Preferably, there are two fixing protrusions 12, which are spaced apart along the length or width direction of the fixing platform 1, forming a front-to-back or left-to-right fixed support structure at the bottom of the fixing platform 1. The fixing protrusions 12 extend away from the fixing surface 11, and the axes of the plurality of fixing protrusions 12 are inclined relative to the normal direction of the fixing surface 11, so that the extension direction of the fixing protrusions 12 is offset to one side of the length direction of the fixing platform 1, rather than perpendicular to the fixing surface 11. The fixing protrusion 12 can be tapered, with a larger cross-sectional area at the end near the fixing surface 11 and a smaller cross-sectional area at the end away from the fixing surface 11. This results in a narrower entry end and a wider bearing root. A gradually widening transition section or a smooth transition surface can be provided at the connection between the fixing protrusion 12 and the fixing surface 11, creating a continuous connection between the inclined fixing protrusion 12 and the fixing platform 1, reducing abrupt changes at the root. Because a preset angle is formed between the fixing protrusion 12 and the fixing platform 1, the fixing protrusion 12 can enter along the preset oblique hole direction at the tibial end, while the fixing surface 11 maintains its contact with the tibial end, thus creating a coordinated relationship between the entry direction of the fixing protrusion 12 and the bearing posture of the fixing platform 1. Simultaneously, the inclined fixing protrusion 12 can provide both axial embedding force and a limiting force along the fixing surface 11 when under stress, thereby enhancing the anti-displacement capability and post-installation posture retention capability of the fixing platform 1. Furthermore, the cooperation between the fixed protrusion 12 and the pre-set oblique hole can disperse the local load transmitted from the fixed platform 1 to the tibial end, reduce stress concentration in the tibial end installation area, and reduce the risk of cracks, splits or fractures in the tibial end.

[0032] In one embodiment, the fixing protrusion 12 is tapered and gradually tapers away from the fixing surface 11. There are two fixing protrusions 12, which are spaced apart along the length or width of the fixing platform 1, and the axes of the two fixing protrusions 12 are parallel.

[0033] In the above embodiment, two fixed protrusions 12 are formed on the fixed surface 11 at the bottom of the fixed platform 1. Both fixed protrusions 12 are conical in shape and gradually taper away from the fixed surface 11. The end of the fixed protrusion 12 closest to the fixed surface 11 is the root end, which is connected to the fixed surface 11. Its cross-sectional dimension is larger than that of the end of the fixed protrusion 12 away from the fixed surface 11, so that the fixed protrusion 12 as a whole forms a conical shape that tapers outward from the fixed surface 11. The end of the fixed protrusion 12 away from the fixed surface 11 can be set as a blunt end, a rounded end, or a chamfered inlet end to reduce end interference when the fixed protrusion 12 enters the preset oblique hole. The end of the fixed protrusion 12 closest to the fixed surface 11 can be connected to the fixed surface 11 through a rounded transition surface or a gradually expanding transition section, so that a continuous transition structure is formed between the fixed protrusion 12 and the fixed platform 1, avoiding abrupt cross-sectional changes at the root of the fixed protrusion 12.

[0034] Two fixed protrusions 12 are spaced apart along the length or width of the fixed platform 1, forming a two-point support positioning relationship at the bottom of the fixed platform 1. The axes of the two fixed protrusions 12 are arranged parallel, so that they have a consistent extension direction in the corresponding preset oblique holes, which facilitates the fixed platform 1 to cooperate with the preset oblique holes while maintaining a consistent overall posture. Since both fixed protrusions 12 are tapered and tapered structures, when they enter the preset oblique holes, they can be guided from the smaller end first, and then gradually form a stable abutment from the larger root end; at the same time, the two parallel fixed protrusions 12 can jointly limit the sway of the fixed platform 1 relative to the tibia, so that the fixed platform 1 has better front-to-back or left-to-right stability when subjected to force, and is not subjected to force at a single fixed point. The distributed fixation formed by the two spaced tapered fixed protrusions 12 allows the fixing surface 11 of the fixed platform 1 to maintain a more stable abutment state.

[0035] In one example, the projection of the axis of the fixed protrusion 12 onto the fixed surface 11 extends along the length direction of the fixed platform 1.

[0036] In the above embodiment, the projection of the axis of the fixing protrusion 12 onto the fixing surface 11 extends along the length direction of the fixing platform 1. That is, although the fixing protrusion 12 is inclined relative to the normal direction of the fixing surface 11, its inclination direction is not deflected towards the width direction or diagonal direction of the fixing platform 1, nor is it arbitrarily offset towards the diagonal direction of the fixing platform 1. Instead, it forms a defined inclined extension relationship along the length direction of the fixing platform 1. The fixing platform 1 may have a relatively long front-to-back extension dimension and a relatively short left-to-right extension dimension. The axis projection of the fixing protrusion 12 is arranged along this longer direction, so that the fixing protrusion 12 forms an inlet structure at the bottom of the fixing platform 1 that conforms to the long axis direction of the platform. The end of the fixing protrusion 12 away from the fixing surface 11 is offset relative to its root end towards the length direction of the fixing platform 1, so that a directional preset angle is formed between the fixing protrusion 12 and the fixing surface 11.

[0037] The axis of the fixed protrusion 12 aligns its guide direction with the length direction of the fixed platform 1. When the fixed platform 1 engages with the preset oblique hole, it can establish a positioning relationship along a relatively defined length path. Since the tilted projection direction of the fixed protrusion 12 is limited by the length direction of the fixed platform 1, the fixed protrusion 12, after entering the preset oblique hole, can create an embedded constraint on the movement of the fixed platform 1 along its length direction, while simultaneously reducing the lateral offset tendency of the platform caused by width offset. For a fixed platform 1 with a long, narrow, or elliptical shape, the length direction typically corresponds to its main load-bearing and positioning direction. The fixed protrusion 12 extends obliquely along this direction, helping to ensure that the guide trajectory of the fixed protrusion 12 is consistent with the overall posture of the fixed platform 1, thereby improving the fitting stability and directional recognition of the fixed platform 1 at the predetermined position.

[0038] In one example, a plurality of convex lobes 13 are formed on the outer periphery of the fixed protrusion 12. The plurality of convex lobes 13 are arranged in a circular array around the axis of the fixed protrusion 12, and the convex lobes 13 extend along the end of the fixed protrusion 12 away from the fixed surface 11 to the fixed surface 11.

[0039] In the above embodiment, a plurality of convex lobes 13 are formed on the outer periphery of the fixed protrusion 12, and the plurality of convex lobes 13 are arranged in a circular array around the axis of the fixed protrusion 12. The fixed protrusion 12 has a central cone-shaped body, and the convex lobes 13 are formed outward from the outer periphery of the central cone-shaped body. The plurality of convex lobes 13 are arranged at intervals along the circumference, and an inward concave transition region is formed between adjacent convex lobes 13. The convex lobes 13 extend from the end of the fixed protrusion 12 away from the fixed surface 11 to the fixed surface 11, so that the convex lobes 13 form a continuous longitudinal protrusion structure in the length direction of the fixed protrusion 12, and are not locally provided in a certain section of the fixed protrusion 12. Each convex lobe 13 may have an arc-shaped outer surface, and the two sides of the convex lobe 13 are connected to the adjacent inward concave transition region through a smooth transition surface, so that the outer periphery of the fixed protrusion 12 forms a continuously undulating non-circular cross section.

[0040] Since the convex portion 13 extends along the length of the fixed protrusion 12, after the fixed protrusion 12 enters the preset oblique hole, it can not only form axial contact through its own conical shape, but also form anti-rotation limiting through the circumferential fit between the convex portion 13 and the inner wall of the preset oblique hole. Multiple convex portions 13 are distributed in a circumferential array, so that the outer periphery of the fixed protrusion 12 has an outwardly convex contact area in different directions, which is beneficial for forming balanced circumferential support. The concave transition area between adjacent convex portions 13 can serve as a clearance space or a receiving space to accommodate local minor deformation of the hole wall or the presence of interface filling material, thereby improving the fit stability between the fixed protrusion 12 and the preset oblique hole.

[0041] In one example, the outer periphery of the fixing protrusion 12 includes three lobes 13, and a circular protrusion 14 is formed on the side of the lobes 13 away from the fixing protrusion 12. The circular protrusion 14 extends along the end of the fixing protrusion 12 away from the fixing surface 11 to the fixing surface 11, so that the cross section of the fixing protrusion 12 is clover-shaped.

[0042] In the above embodiment, the outer periphery of the fixed protrusion 12 includes three lobes 13, which are distributed around the axis of the fixed protrusion 12. Each lobe 13 forms a circular protrusion 14 on the side away from the center of the fixed protrusion 12. The circular protrusion 14 can be understood as the highest region of the outer arc of the lobe 13, extending along the end of the fixed protrusion 12 away from the fixing surface 11 to the fixing surface 11, thus forming three continuous arcuate ridges along the length of the fixed protrusion 12. The three circular protrusions 14 are connected by concave arcuate regions, making the cross-section of the fixed protrusion 12 approximately clover-shaped. The clover-shaped cross-section can maintain the same contour along the extension direction of the fixed protrusion 12, or it can be proportionally reduced as the fixed protrusion 12 tapers towards a tapered shape, giving the fixed protrusion 12 both tapered guiding characteristics and non-circular anti-rotation characteristics.

[0043] The three convex lobes 13 are distributed in a three-way manner, which, compared to single-sided or double-sided protrusions, can form a more stable three-point peripheral support around the fixed protrusion 12. When the circular protrusion 14 contacts the wall of the preset oblique hole, it can form multiple spaced contact areas, while the concave area between adjacent circular protrusions 14 can provide a certain clearance space, so that the fixed protrusion 12 is not prone to eccentric shaking due to contact in a single direction under stress. The clover-shaped cross section can also enable the fixed protrusion 12 to form a directional fit with the preset oblique hole, that is, when the fixed protrusion 12 rotates around its own axis, it will be restricted by the cross section contour, thereby enhancing the circumferential positioning capability of the fixed platform 1. Combined with the inclined setting of the fixed protrusion 12, it can form a more stable structural constraint in the introduction direction, the contact direction of the fixed surface 11, and the circumferential rotation direction.

[0044] In one example, the ratio of the cross-sectional area of ​​the fixed protrusion 12 near the fixed surface 11 to the cross-sectional area of ​​the fixed protrusion 12 away from the fixed surface 11 is 1.5~2.5:1, and the preset included angle is 10°~45°.

[0045] In the above embodiment, the cross-sectional areas of the two ends of the fixed protrusion 12 are set to have a differential tapering relationship. The end of the fixed protrusion 12 closer to the fixed surface 11 serves as the connecting end, and its cross-sectional area is larger than that of the end of the fixed protrusion 12 farther from the fixed surface 11. The ratio of the two cross-sectional areas is 1.5~2.5:1. This ensures that the fixed protrusion 12 has both a small end entry area and a relatively sufficient root bearing area, avoiding the fixed protrusion 12 being too thin overall, which would affect the connection strength, and also avoiding an abrupt transition on the outer periphery of the fixed protrusion 12 due to an excessive difference between the root and the end. The fixed protrusion 12 can form a continuous conical surface along its axial direction, with the conical surface gradually converging from the connecting end to the free end. The connecting end and the fixed surface 11 can be connected by a rounded corner surface, a frustum transition surface, or a thickened root to form a smoother force transmission path.

[0046] The fixed protrusion 12 forms a preset angle of 10° to 45° with respect to the normal direction of the fixed surface 11. This angle range allows the fixed protrusion 12 to be clearly distinguished from the vertically extending structure and ensures directional alignment between the extension direction of the fixed protrusion 12 and the bearing posture of the fixed platform 1. If the preset angle is too small, the fixed protrusion 12 is arranged almost vertically, making it difficult to fully demonstrate the oblique insertion feature; if the preset angle is too large, the force at the root between the fixed protrusion 12 and the fixed surface 11 is prone to concentration, and the effective embedding depth of the fixed protrusion 12 may be affected. Therefore, by combining the cross-sectional area ratio and the preset angle, the fixed protrusion 12 can maintain the strength of the root structure and the contact stability with the preset oblique hole while providing convenient insertion, making it less likely for the fixed platform 1 to deviate along the direction of the fixed surface 11 under stress.

[0047] In one embodiment, one side of the fixed platform 1 extends upward to form an abutment portion 15, the upper end surface of the abutment portion 15 protrudes from the upper end surface of the fixed platform 1, one side of the pad 2 abuts against the side of the abutment portion 15, and a rounded transition portion 16 is formed at the junction of the abutment portion 15 and the fixed surface 11.

[0048] In the above embodiment, one side of the fixed platform 1 extends upward to form an abutment portion 15. The abutment portion 15 can be integrally formed with the fixed platform 1, or it can be a raised edge formed by locally thickening the edge of the fixed platform 1. The upper end surface of the abutment portion 15 is higher than the upper end surface of the fixed platform 1, so that it forms a limiting structure that is higher than the bearing area on one side of the fixed platform 1. After the pad 2 is disposed on the upper end surface of the fixed platform 1, one side of the pad 2 abuts against the side of the abutment portion 15. The side of the abutment portion 15 can be a vertical plane, or it can be a slope that is slightly inward towards the pad 2, or it can form an arc-shaped sidewall with rounded corners to adapt to the shape of the edge of the pad 2. The side of the pad 2 near the abutment portion 15 can be set as a straight edge, an arc-shaped edge, or a stepped edge, so that it can form a relatively stable side positioning relationship with the abutment portion 15.

[0049] The abutment portion 15 not only serves as the edge abutment reference for the pad 2, but also forms a clear assembly area boundary on the upper surface of the fixed platform 1, enabling the pad 2 to have a stable lateral positioning state on the fixed platform 1. A rounded transition portion 16 is formed at the junction of the abutment portion 15 and the fixed surface 11. The rounded transition portion 16 can extend continuously along the length of the abutment portion 15, ensuring that the connection between the abutment portion 15, the main body of the fixed platform 1, and the fixed surface 11 is not abrupt at a right angle, but rather forms a smooth transition structure. Since the abutment portion 15 is located in the edge region of the fixed platform 1, it is prone to local stress concentration when subjected to lateral forces from the pad 2. The rounded transition portion 16 enhances the structural continuity of the edge of the fixed platform 1, reducing the possibility of cracks or local deformation at the root of the abutment portion 15 under stress, thereby improving the reliability of the side-limiting structure of the pad 2.

[0050] In one embodiment, the end of the femoral prosthesis 3 away from the pad 2 is recessed to form a connecting surface 32. The connecting surface 32 is provided with at least two columnar protrusions 33 extending away from the connecting surface 32. The two columnar protrusions 33 are spaced apart along the length direction of the fixing platform 1, and the axes of the two columnar protrusions 33 are parallel. The end of the columnar protrusion 33 away from the connecting surface 32 forms an inlet fillet 34. The columnar protrusion 33 is used to be pushed into the preset insertion hole at the femoral end. The outer peripheral surface of the columnar protrusion 33 is provided with at least one of the following: an annular groove, a longitudinal groove, a rough surface, or a porous surface, so as to improve the connection stability between the femoral prosthesis 3 and the femoral end.

[0051] In the above embodiment, the end of the femoral prosthesis 3 away from the liner 2 is recessed inward to form a connecting surface 32. The connecting surface 32 can be a concave curved surface, a stepped surface, or a composite fitting surface adapted to the local shape of the femoral end. At least two columnar protrusions 33 are provided on the connecting surface 32. The columnar protrusions 33 extend in a direction away from the connecting surface 32. The two columnar protrusions 33 are spaced apart along the length direction of the fixing platform 1, so that the femoral prosthesis 3 forms a front-to-back connecting support in its length direction. The axes of the columnar protrusions 33 are arranged in parallel, so that the multiple columnar protrusions 33 have a consistent extension direction, which facilitates the correspondence with the preset insertion hole at the femoral end. The end of the columnar protrusion 33 away from the connecting surface 32 forms an inlet fillet 34. The inlet fillet 34 can be a hemispherical end face, a rounded chamfer, or an arc-shaped transition end to reduce sharp contact between the end of the columnar protrusion 33 and the opening of the preset insertion hole.

[0052] The outer peripheral surface of the columnar protrusion 33 can be provided with one or more of the following: annular groove, longitudinal groove, rough surface, or porous surface. The annular groove can form a recessed band along the circumference of the columnar protrusion 33, creating a stepped fitting area in the axial direction. The longitudinal groove can be provided along the extension direction of the columnar protrusion 33, forming several longitudinal recessed areas on the outer peripheral surface to improve the circumferential recognizability of the columnar protrusion 33. The rough surface or porous surface can cover part or all of the outer periphery of the columnar protrusion 33 to increase the contact area of ​​the outer peripheral surface. After the connecting surface 32 is recessed, the columnar protrusion 33 extends from the recessed area, so that the connecting side of the femoral prosthesis 3 has both a fitting surface and an insertion-type fixation structure, thereby forming a mating relationship between axial positioning and surface fitting positioning of the femoral prosthesis 3, improving the stability of the connection state of the femoral prosthesis 3.

[0053] In one embodiment, the radius of curvature of the first arcuate portion 21 is greater than the radius of curvature of the second arcuate portion 31, and the center of curvature of the first arcuate portion 21 does not coincide with the center of curvature of the second arcuate portion 31.

[0054] In the above embodiment, the upper end face of the pad 2 is concave to form a first arcuate surface 21, and the femoral prosthesis 3 protrudes towards the side of the pad 2 to form a second arcuate surface 31. The radius of curvature of the first arcuate surface 21 is greater than that of the second arcuate surface 31, and the center of curvature of the first arcuate surface 21 is separate from the center of curvature of the second arcuate surface 31. The first arcuate surface 21 can be configured as a shallow concave arcuate surface extending along the length direction of the fixed platform 1, with its two side edges slightly higher than the central region, so that the upper end face of the pad 2 forms an inclusive sliding bearing area. The second arcuate surface 31 is an outwardly convex arcuate surface or a composite arcuate surface, and its degree of protrusion is greater than that of the concavity of the first arcuate surface 21, so that when the two come into contact, they are not completely concentrically fitted, but form a variable contact area during relative movement.

[0055] Because the radius of curvature of the first arcuate portion 21 is relatively large, its curvature change is relatively gentle, providing a larger allowable sliding range for the second arcuate portion 31. The radius of curvature of the second arcuate portion 31 is smaller, allowing for a relatively clear contact center to be formed within the first arcuate portion 21. The fact that their centers of curvature do not coincide ensures that when the femoral prosthesis 3 slides relative to the liner 2, the contact position can smoothly shift with relative movement, rather than remaining concentrated in a fixed area. The first arcuate portion 21 and the second arcuate portion 31 can transition from line contact to surface contact, or they can form a localized surface contact area under load, thereby reducing the possibility of excessive stress on the local edges of the upper surface of the liner 2.

[0056] In one embodiment, the fixation platform 1 and the femoral prosthesis 3 are both made of polyetheretherketone, carbon fiber reinforced polyetheretherketone, or polyetherketoneketone, and the pad 2 is made of ultra-high molecular weight polyethylene, highly cross-linked polyethylene, or vitamin E stabilized ultra-high molecular weight polyethylene.

[0057] In the above embodiments, both the fixation platform 1 and the femoral prosthesis 3 can be made of polyetheretherketone (PEEK), carbon fiber reinforced PEEK, or polyetherketoneketone (PEKK). The fixation platform 1, as a structural component supporting the pad 2 and abutting against the tibial end, needs to possess certain structural strength and dimensional stability. The femoral prosthesis 3, as a structural component slidingly fitted with the pad 2 and connected to the femoral end via columnar protrusions 33, also needs to balance strength, wear resistance, and molding precision. PEEK, carbon fiber reinforced PEEK, and PEEKK are all high-performance polymer materials that can be formed into fine structures such as the fixation protrusions 12 on the fixation platform 1, the second arcuate surface 31 on the femoral prosthesis 3, and the columnar protrusions 33 through machining, molding, or additive manufacturing. For carbon fiber reinforced PEEK, its fiber reinforcement phase can be arranged along the main stress direction of the fixation platform 1 or the femoral prosthesis 3 to improve the bending or compressive strength of the corresponding area.

[0058] The pad 2 can be made of one of the following materials: ultra-high molecular weight polyethylene (UHMWPE), highly cross-linked polyethylene (QXLPE), or vitamin E-stabilized UHMWPE. The pad 2 is located between the fixation platform 1 and the femoral prosthesis 3, with its first curved surface 21 directly sliding in contact with its second curved surface 31. Therefore, it needs to have low friction characteristics and good wear resistance. UHMWPE is suitable for forming a load-bearing pad 2 with a smooth curved surface. Highly cross-linked polyethylene can improve the wear resistance of the pad 2, while vitamin E-stabilized UHMWPE can further improve material stability. By using different material systems for the fixation platform 1, femoral prosthesis 3, and pad 2, the support structure and sliding load-bearing structure can respectively meet the requirements for strength, fit, and low friction, thereby improving the functional adaptability of the overall prosthesis structure.

[0059] Reference Figure 7 In another embodiment, the present invention also provides a method for installing a unicompartmental knee prosthesis structure, employing the unicompartmental knee prosthesis structure as described in any of the preceding claims, comprising: S1: A fixing platform 1 and a tibial end are provided. The bottom end of the fixing platform 1 forms a fixing surface 11. The fixing surface 11 is provided with a plurality of fixing protrusions 12. The fixing protrusions 12 extend in a direction away from the fixing surface 11. The axes of the plurality of fixing protrusions 12 are inclined relative to the normal direction of the fixing surface 11. A preset angle is formed between the fixing protrusions 12 and the fixing platform 1. The upper end surface of the tibial end forms two support portions 4. In step S1, the aforementioned unicompartmental knee prosthesis structure is used, which will not be described in detail here. One of the support parts 4 can be selected as the installation area according to the location of the lesion, so that the fixation platform 1 can be installed in the local bearing area of ​​the tibial end.

[0060] S2: Based on the dimensions of the fixed surface 11, an initial hole is machined on one of the support parts 4. Using the initial hole as the cutting termination area, the support part 4 with the initial hole is cut to form a mounting part. In step S2, an initial hole is first machined on the selected support portion 4 according to the external dimensions of the fixing surface 11, the preset installation position of the fixing platform 1 on the tibia, and the dimensions of the rounded transition portion 16 between the abutment portion 15 on one side of the fixing platform 1 and the fixing surface 11. Specifically, one side of the fixing platform 1 extends upward to form the abutment portion 15, and the junction of the abutment portion 15 and the fixing surface 11 forms the rounded transition portion 16. Based on the dimensions of the fixing surface 11 and the radius of the rounded transition portion 16, an initial hole corresponding to the rounded transition portion 16 is machined on one of the support portions 4. The position of the initial hole can be determined according to the installation range of the fixing surface 11 on the support portion 4, so that the initial hole is located in the junction area of ​​the subsequent horizontal bearing surface 5 and the vertical abutment surface 6.

[0061] Using the initial hole as the cutting termination area, the support portion 4 with the initial hole is cut to form the mounting portion. The mounting portion is used to cooperate with and support the fixed platform 1. The mounting portion may include a horizontal bearing surface 5, a vertical abutment surface 6, and a tibial rounded corner surface 7 located at the intersection of the horizontal bearing surface 5 and the vertical abutment surface 6.

[0062] S3: Drill holes on the mounting part according to the preset angle to form a preset oblique hole; In step S3, after the mounting portion is formed, holes are drilled in the mounting portion according to the preset angle between the fixing protrusion 12 and the normal direction of the fixing surface 11 to form preset oblique holes that match the extension direction of the fixing protrusion 12. That is, the initial hole and the preset oblique hole are hole structures with different functions: the initial hole is used to assist in forming the tibial rounded surface 7, and the preset oblique hole is used to accommodate the fixing protrusion 12.

[0063] Specifically, the horizontal bearing surface 5 of the mounting part can be used as the drilling reference surface. According to the inclination direction and preset angle of the fixing protrusion 12, preset oblique holes are machined on the horizontal bearing surface 5. The number, position and inclination direction of the preset oblique holes correspond to the fixing protrusion 12 at the bottom of the fixing platform 1, so that when the fixing platform 1 is installed, the fixing protrusion 12 can be pushed into the preset oblique hole along the extension direction of the preset oblique hole.

[0064] Since the pre-set oblique hole is processed after the mounting part is formed, the position of the pre-set oblique hole can be further determined based on the already formed horizontal bearing surface 5, vertical abutment surface 6 and tibial rounded corner surface 7, so as to avoid interference between the pre-set oblique hole and the processing area of ​​the tibial rounded corner surface 7 and improve the fitting accuracy between the fixing protrusion 12 and the pre-set oblique hole.

[0065] S4: Inject a fixed amount of bone cement into the pre-set oblique hole.

[0066] In step S4, bone cement is applied into the pre-set oblique hole, or simultaneously applied to the outer peripheral surface of the fixation protrusion 12 and the pre-set oblique hole. The bone cement is mainly distributed in the mating area between the fixation protrusion 12 and the pre-set oblique hole, and is used to fill the gap between the two after the fixation protrusion 12 is inserted into the pre-set oblique hole, thereby improving the connection strength and initial fixation stability between the fixation protrusion 12 and the tibial end.

[0067] The diffusion of bone cement to the fixation surface 11 can be limited by controlling the amount of bone cement applied. For example, the bone cement can be made to cover only part of the outer peripheral surface of the fixation protrusion 12, or the amount of bone cement filling in the preset oblique hole can be lower than the opening area of ​​the preset oblique hole, so as to avoid excessive bone cement being squeezed between the fixation surface 11 and the mounting part when the fixation protrusion 12 is inserted into the preset oblique hole.

[0068] S5: The fixing protrusion 12 is pushed into the preset oblique hole along the extension direction of the preset oblique hole, so that the fixing surface 11 abuts against the mounting part, wherein the diffusion of bone cement to the fixing surface 11 is limited by controlling the amount of bone cement injected.

[0069] In step S5, the fixing protrusion 12 of the fixing platform 1 is aligned with the preset oblique hole, and the fixing protrusion 12 is pushed into the preset oblique hole along the extension direction of the preset oblique hole. Since the axis of the fixing protrusion 12 is inclined relative to the normal direction of the fixing surface 11, and the preset oblique hole is formed according to the preset included angle, the fixing protrusion 12 can form an oblique insertion fit with the preset oblique hole.

[0070] After the fixed protrusion 12 is pushed into the preset oblique hole, the fixing surface 11 abuts against the mounting part. The mounting part can support the fixing platform 1, the preset oblique hole can limit the fixed protrusion 12, and the bone cement can form a filling fixation between the fixed protrusion 12 and the preset oblique hole, thereby achieving an initial stable connection between the unicompartmental knee prosthesis structure and the tibial end.

[0071] In one embodiment, one side of the fixed platform 1 extends upward to form an abutment portion 15, and a rounded transition portion 16 is formed at the junction of the abutment portion 15 and the fixed surface 11. The steps of machining an initial hole in one of the support portions 4 according to the dimensions of the fixed surface 11, and cutting the support portion 4 with the initial hole as the cutting termination area to form the mounting portion include: Based on the dimensions of the fixed surface 11, and according to the radius of the fillet transition portion 16, an initial hole corresponding to the fillet transition portion 16 is machined on one of the support portions 4. The support portion 4 with the initial hole is cut sequentially along the first direction and the second direction to form a horizontal bearing surface 5 and a vertical abutment surface 6, so that the initial hole forms a tibial rounded corner surface 7 after cutting; The cutting path of the support part 4 with the initial hole is tangent to the initial hole, and the first direction is perpendicular to the second direction.

[0072] In the above embodiment, the support portion 4 with the initial hole is cut sequentially along the first direction and the second direction to form a horizontal bearing surface 5 and a vertical abutment surface 6, so that the initial hole forms a tibial rounded corner surface 7 after cutting. The cutting path of the support portion 4 with the initial hole is tangent to the initial hole, and the first direction is perpendicular to the second direction. By making the cutting path tangent to the initial hole, a rounded transition structure, i.e., the tibial rounded corner surface 7, can be naturally formed at the intersection of the horizontal bearing surface 5 and the vertical abutment surface 6, thereby avoiding a sharp angle between the horizontal bearing surface 5 and the vertical abutment surface 6.

[0073] The first direction can be horizontal, and the second direction can be vertical; alternatively, the first direction can be vertical, and the second direction can be horizontal, as long as they are perpendicular to each other and can form a mounting part for mating with the fixed platform 1. During the cutting process, since the initial hole is pre-formed, the cutting tool or cutting path terminates or becomes tangentially connected to the initial hole when it approaches it, so that the junction of the cut tibial end retains a rounded transition shape. Compared to directly cutting the horizontal and vertical cutting surfaces into a right-angle junction, this method can reduce stress concentration at the junction of the mounting part and reduce the risk of cracks, splits, or fractures at the tibial end.

[0074] In one embodiment, the fixing surface 11 is coated with a biological coating; The step of bringing the fixing surface 11 into contact with the mounting part includes: The fixing surface 11 is abutted against the horizontal bearing surface 5 along the second direction, the abutting part 15 is abutted against the vertical abutting surface 6 along the first direction, and the rounded transition part 16 is fitted with the tibial rounded surface 7.

[0075] In the above embodiments, the fixation surface 11 is coated with a biological coating. By controlling the amount of bone cement coating to limit the diffusion of bone cement to the fixation surface 11, the risk of bone cement entering between the fixation surface 11 and the mounting part can be reduced, and the bone cement can be prevented from obscuring the biological coating on the fixation surface 11. This allows the biological coating to form bone ingrowth or growth intercalation with the tibial end in the later stage, thereby achieving long-term stable fixation.

[0076] The steps of making the fixing surface 11 abut against the mounting part include: abutting the fixing surface 11 against the horizontal bearing surface 5 along the second direction, abutting the abutting part 15 against the vertical abutting surface 6 along the first direction, and fitting the rounded transition part 16 against the tibial rounded surface 7.

[0077] Specifically, when the fixing protrusion 12 is pushed into the preset oblique hole, the fixing surface 11 of the fixing platform 1 abuts against the horizontal bearing surface 5 of the mounting part, the abutting part 15 on one side of the fixing platform 1 abuts against the vertical abutting surface 6 of the mounting part, and the rounded transition part 16 at the junction of the abutting part 15 and the fixing surface 11 fits against the tibial rounded corner surface 7 on the mounting part. Thus, a multi-faceted mating structure is formed between the fixing platform 1 and the mounting part, that is, the fixing surface 11 and the horizontal bearing surface 5 form a supporting fit, the abutting part 15 and the vertical abutting surface 6 form a lateral limiting fit, and the rounded transition part 16 and the tibial rounded corner surface 7 form an arc-shaped fitting fit.

[0078] Through the above-mentioned multi-faceted mating structure, on the one hand, the installation stability of the fixing platform 1 on the tibial end can be improved, reducing the possibility of the fixing platform 1 shifting or wobbling relative to the tibial end; on the other hand, the tibial rounded surface 7 can be adapted to the rounded transition part 16, reducing the stress concentration at the junction of the horizontal bearing surface 5 and the vertical contact surface 6, avoiding the problems of tibial end cracks, splits or fractures that are easily caused by directly cutting vertically or forming a sharp corner groove structure in the prior art.

[0079] Furthermore, in this embodiment, since the initial hole is processed first and then cut using the initial hole as the cutting termination area, the initial hole forms the tibial rounded corner surface 7 after cutting. Then, a preset oblique hole is processed on the mounting part according to a preset angle. Therefore, the initial hole used to form the rounded corner transition structure can be distinguished from the preset oblique hole used to install the fixing protrusion 12. This processing sequence ensures that the mounting part has a rounded corner support structure adapted to the fixing platform 1, and also ensures the accuracy of the inclined insertion between the preset oblique hole and the fixing protrusion 12, thus balancing the safety of tibial end processing and the stability of prosthesis installation.

[0080] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A knee joint unicompartmental prosthesis structure, characterized by Includes a fixed platform (1), the bottom end of which forms a fixed surface (11), the fixed surface (11) is provided with a plurality of fixed protrusions (12), the fixed protrusions (12) extend in a direction away from the fixed surface (11), the axis of the plurality of fixed protrusions (12) is inclined relative to the normal direction of the fixed surface (11), and a preset angle is formed between the fixed protrusions (12) and the fixed platform (1), wherein the fixed protrusions (12) are used to be pushed into a preset oblique hole at the end of the tibia so that the fixed surface (11) abuts against the end of the tibia.

2. A unicompartmental knee prosthesis according to claim 1, wherein, The fixed protrusion (12) is tapered and gradually tapers away from the fixed surface (11). There are two fixed protrusions (12). The two fixed protrusions (12) are spaced apart along the length or width of the fixed platform (1), and the axes of the two fixed protrusions (12) are parallel.

3. The unicompartmental knee prosthesis according to claim 1, wherein, The projection of the axis of the fixed protrusion (12) onto the fixed surface (11) extends along the length direction of the fixed platform (1); The ratio of the cross-sectional area of ​​the fixed protrusion (12) near the fixed surface (11) to the cross-sectional area of ​​the fixed protrusion (12) away from the fixed surface (11) is 1.5~2.5:1, and the preset included angle is 10°~45°.

4. The unicompartmental knee prosthesis according to claim 1, wherein, The outer periphery of the fixed protrusion (12) has a plurality of convex lobes (13), which are arranged in a circular array around the axis of the fixed protrusion (12). The convex lobes (13) extend along the end of the fixed protrusion (12) away from the fixed surface (11) to the fixed surface (11).

5. A unicompartmental knee prosthesis according to claim 4, wherein, The outer periphery of the fixed protrusion (12) includes three lobes (13), and a circular protrusion (14) is formed on the side of the lobes (13) away from the fixed protrusion (12). The circular protrusion (14) extends along the end of the fixed protrusion (12) away from the fixed surface (11) to the fixed surface (11) so that the cross section of the fixed protrusion (12) is clover-shaped.

6. The unicompartmental knee prosthesis according to claim 1, wherein, One side of the fixed platform (1) extends upward to form an abutment part (15), the upper end surface of the abutment part (15) protrudes from the upper end surface of the fixed platform (1), and a rounded transition part (16) is formed at the junction of the abutment part (15) and the fixed surface (11).

7. The unicompartmental knee prosthesis according to claim 1, wherein, The fixed platform (1) is prepared from one of polyetheretherketone, carbon fiber reinforced polyetheretherketone or polyetherketoneketone.

8. A method for installing a unicompartmental knee prosthesis, characterized in that, The unicompartmental knee prosthesis structure as described in any one of claims 1-7 comprises: A fixation platform and a tibial end are provided. The bottom end of the fixation platform forms a fixation surface. The fixation surface is provided with a plurality of fixation protrusions. The fixation protrusions extend in a direction away from the fixation surface. The axes of the plurality of fixation protrusions are inclined relative to the normal direction of the fixation surface. A preset angle is formed between the fixation protrusions and the fixation platform. The upper end surface of the tibial end forms two support portions. Based on the dimensions of the fixed surface, an initial hole is machined on one of the support parts. Using the initial hole as the cutting termination area, the support part with the initial hole is cut to form the mounting part. Drill holes in the mounting part according to the preset angle to form a preset oblique hole; A measured amount of bone cement is injected into the pre-designed oblique holes; The fixing protrusion is pushed into the preset inclined hole along the extension direction of the preset inclined hole, so that the fixing surface abuts against the mounting part. The diffusion of bone cement to the fixing surface is restricted by controlling the amount of bone cement injected.

9. The method of installing a knee unicompartmental prosthesis according to claim 8, wherein, One side of the fixed platform extends upward to form an abutment portion, and a rounded transition portion is formed at the junction of the abutment portion and the fixed surface; The steps include machining an initial hole in one of the support portions according to the dimensions of the fixed surface, using the initial hole as the cutting termination area, and cutting the support portion with the initial hole to form the mounting portion, including: Based on the dimensions of the fixed surface, and according to the radius of the fillet transition, an initial hole corresponding to the fillet transition is machined on one of the support parts; The support portion with the initial hole is cut sequentially along the first and second directions to form a horizontal bearing surface and a vertical abutment surface, so that the initial hole forms a tibial rounded corner surface after cutting; The cutting path for cutting the support portion with the initial hole is tangent to the initial hole, and the first direction is perpendicular to the second direction.

10. The method of installing a knee unicompartmental prosthesis according to claim 9, wherein, The fixed surface is coated with a biological coating; The step of bringing the fixing surface into contact with the mounting part includes: The fixing surface is abutted against the horizontal bearing surface along the second direction, the abutting part is abutted against the vertical abutting surface along the first direction, and the rounded transition part is fitted with the rounded corner surface of the tibia.

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