CN216417426U - Knee joint prosthesis - Google Patents

Abstract

The utility model provides a knee joint prosthesis comprising: a tibial plateau; the gasket is movably arranged on the tibial plateau; the plug connection structure is arranged between the tibial plateau and the gasket; the vertical limiting structure is arranged between the tibial platform and the gasket, so that the vertical position between the tibial platform and the gasket is kept unchanged, and the gasket and the tibial platform can rotate mutually. The technical scheme of the application effectively solves the problem that the knee joint prosthesis in the related technology is easy to dislocate.

Description

Knee joint prosthesis

Technical Field

The utility model relates to a medical instrument, in particular to a knee joint prosthesis.

Background

The knee joint is the main joint of the lower limb, and its structure and function are the most complex of the human joints. Meanwhile, the knee joint is also one of the most vulnerable joints. Knee replacement surgery is an effective means of treating severe lesions and deformities of the knee joint. Successful knee replacement can significantly relieve knee pain of patients, improve knee function, and ensure the stability of lower limb standing and the joint movement function required by daily life.

Currently, a fixed knee joint prosthesis system and a movable knee joint prosthesis system are mainly adopted clinically in knee joint replacement. Compared with a fixed knee joint prosthesis system, the movable knee joint prosthesis system has the following characteristics: (1) the lower surface of the gasket of the movable knee joint prosthesis and the upper surface of the tibial plateau can realize relative rotation, and the normal knee joint motion rule of a human body is met; (2) in the relative rotation process of the lower surface of the gasket of the movable knee joint prosthesis and the upper surface of the tibial plateau, the relative movement range of the femoral condyle and the gasket is reduced; this greatly increases the contact area between the femoral condyle and the shim, reducing the interfacial shear stress between the femoral condyle and the shim. Based on the characteristics, the wear rate of the movable knee joint prosthesis gasket is more than 50% of that of the fixed knee joint prosthesis, and the service life of the movable knee joint prosthesis is more than 10% of that of the fixed knee joint prosthesis. At present, the movable knee joint prosthesis system which is clinically adopted is mostly a lower pile type movable knee joint prosthesis system with a gasket having a lower upright post. The lower pile type movable knee joint prosthesis system has no limit structure, and 360-degree relative rotation can be realized between the gasket and the tibial platform; therefore, the requirement on the integrity of the collateral ligament is high, and the collateral ligament is easy to tear. In addition, the gasket of the lower pile type movable knee joint prosthesis system is easy to jump out of the tibial plateau, so that the prosthesis is dislocated, and secondary injury is brought to a patient.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to provide a knee joint prosthesis, so as to solve the problem that the knee joint prosthesis in the related art is easy to dislocate.

In order to achieve the above object, the present invention provides a knee joint prosthesis comprising: a tibial plateau; the gasket is movably arranged on the tibial plateau; the plug connection structure is arranged between the tibial plateau and the gasket; the vertical limiting structure is arranged between the tibial platform and the gasket, so that the vertical position between the tibial platform and the gasket is kept unchanged, and the gasket and the tibial platform can rotate mutually.

Further, vertical limit structure includes spacing groove and stopper, and the stopper inserts to the spacing inslot, and one of spacing groove and stopper sets up on tibial plateau, and another of spacing groove and stopper sets up on the gasket.

Furthermore, the limiting groove is formed in the side portion of the gasket, the limiting block is arranged on the side portion of the tibial platform and comprises a connecting section and a limiting section connected with the connecting section, the limiting section protrudes out of the connecting section and is inserted into the limiting groove, and the connecting section is connected with the tibial platform.

Furthermore, the extending direction of the limiting groove is parallel to the upper surface of the tibial platform, and the limiting section is parallel to the upper surface of the tibial platform.

Further, the height of the groove wall of the limiting groove close to the tibial platform is smaller than the height of the groove wall of the limiting groove far away from the tibial platform, and/or the circumferential size of the limiting groove is larger than the circumferential size of the limiting block, so that the limiting block can slide in the limiting groove.

Furthermore, the plug connection structure comprises a first connection hole and a connection column penetrating through the first connection hole, and the first connection hole is in plug fit with the connection column; or, the inserting connection structure comprises a first connection hole, a second connection hole and a connection column penetrating through the first connection hole and the second connection hole, and the connection column is matched with the first connection hole and the second connection hole in an inserting mode.

Furthermore, the knee joint prosthesis further comprises a limiting structure, and the limiting structure is arranged between the tibial plateau and the connecting column.

Further, limit structure is including setting up the convex part on the spliced pole and setting up the first concave part on tibial plateau, and convex part and first concave part are pegged graft and are cooperated, and wherein, the convex part is polygonal structure, and first concave part is the polygon hole.

Further, a second concave portion is arranged on the tibial platform and located above the first concave portion, and the projection of the second concave portion on the horizontal plane is larger than that of the first concave portion.

Further, first concave part and first connecting hole correspond the setting, and first connecting hole is the through-hole, is provided with first spacing portion in the first connecting hole, and first concave part is located the top of first spacing portion.

Further, the spliced pole is including the first section that is located the convex part top and the second section that is located the convex part below, and first section and gasket cooperation of pegging graft, second section and first connecting hole interference fit, the surface of first section are the smooth surface, are provided with helicitic texture on the second section.

Furthermore, the knee joint prosthesis further comprises a plug, wherein a threaded hole is formed in the plug, and the threaded hole is in threaded connection with the second section.

Further, be provided with the spacing portion of second on the outer wall of end cap, the partial structure of end cap inserts to first connecting hole in, spacing portion of second and tibial plateau butt cooperation.

By applying the technical scheme of the utility model, the gasket is movably arranged on the tibial platform, the plug connection structure is arranged between the tibial platform and the gasket, and the plug connection structure can connect the tibial platform and the gasket. Vertical limit structure sets up between tibial plateau and gasket, and vertical limit structure can restrict the vertical position of tibial plateau and gasket, namely makes the vertical position of tibial plateau and gasket unchangeable, and simultaneously, tibial plateau and gasket can rotate relatively. Through foretell vertical limit structure's setting, can prevent to deviate from between gasket and the tibial plateau effectively to, owing to set up plug connection structure, plug connection structure can form auto-lock structure with vertical limit structure, further prevents to throw off between tibial plateau and the gasket. Therefore, the technical scheme of the application effectively solves the problem that the knee joint prosthesis in the related art is easy to dislocate.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 shows a perspective view of an embodiment of a knee joint prosthesis according to the present invention;

FIG. 2 shows a cross-sectional schematic view of the knee prosthesis of FIG. 1;

FIG. 3 illustrates a perspective view of a tibial plateau of the knee prosthesis of FIG. 1;

fig. 4 shows a cross-sectional schematic view of the tibial plateau of fig. 3;

FIG. 5 shows a perspective view of a shim of the knee joint prosthesis of FIG. 1;

FIG. 6 shows a schematic cross-sectional view of the shim of FIG. 3;

FIG. 7 shows a schematic perspective view of an attachment post of the knee joint prosthesis of FIG. 1; and

fig. 8 shows a perspective view of the plug of the knee prosthesis of fig. 1.

Wherein the figures include the following reference numerals:

10. a tibial plateau; 11. a second recess; 20. a gasket; 30. a plug-in connection structure; 31. a first connection hole; 311. a first limiting part; 32. a second connection hole; 33. connecting columns; 331. a first stage; 332. a second stage; 40. a vertical limiting structure; 41. a limiting groove; 42. a limiting block; 421. a connecting section; 422. a limiting section; 50. a limiting structure; 51. a convex portion; 52. a first recess; 60. a plug; 61. a second limiting part.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to avoid the tibial plateau and the shim from becoming detached, as shown in fig. 1 to 6, in the present embodiment, the knee joint prosthesis comprises: tibial plateau 10, shim 20, plug connection structure 30, and vertical stop structure 40. Shim 20 is movably disposed on tibial plateau 10. A plug connection structure 30 is provided between tibial plateau 10 and insert 20. The vertical stop 40 is disposed between the tibial plateau 10 and the insert 20 to maintain a vertical position between the tibial plateau 10 and the insert 20 and to enable the insert 20 and the tibial plateau 10 to rotate relative to each other.

By applying the technical solution of the present embodiment, the shim 20 is movably disposed on the tibial plateau 10, the plug connection structure 30 is disposed between the tibial plateau 10 and the shim 20, and the plug connection structure 30 can connect the tibial plateau 10 and the shim 20. The vertical limiting structure 40 is disposed between the tibial plateau 10 and the shim 20, and the vertical limiting structure 40 can limit the vertical positions of the tibial plateau 10 and the shim 20, that is, the vertical positions of the tibial plateau 10 and the shim 20 are not changed, and at the same time, the tibial plateau 10 and the shim 20 can rotate relatively. Through the arrangement of the vertical limiting structure 40, the separation between the shim 20 and the tibial platform 10 can be effectively prevented, and due to the arrangement of the plug connection structure 30, the plug connection structure 30 and the vertical limiting structure 40 can form a self-locking structure, so that the separation between the tibial platform 10 and the shim 20 is further prevented. Therefore, the technical scheme of the embodiment effectively solves the problem that the knee joint prosthesis in the related art is easy to dislocate.

In order to make the vertical limiting structure simpler, as shown in fig. 1 to 6, in this embodiment, the vertical limiting structure 40 includes a limiting groove 41 and a limiting block 42, the limiting block 42 is inserted into the limiting groove 41, one of the limiting groove 41 and the limiting block 42 is disposed on the tibial platform 10, and the other of the limiting groove 41 and the limiting block 42 is disposed on the shim 20. Specifically, in this embodiment, the stop slot 41 is disposed on the insert 20 and the stop 42 is disposed on the tibial plateau 10. The limiting groove 41 and the limiting block 42 are simple in structure and convenient to arrange, and the insertion fit of the limiting groove 41 and the limiting block 42 can effectively limit the position between the shim 20 and the tibial platform 10.

In the embodiment not shown in the figure, vertical limit structure can also include first limit rib and the second limit rib, and first limit rib sets up on tibial plateau, and the spacing muscle of second sets up on the gasket, and the spacing muscle butt cooperation of first limit rib and second is in order to restrict the position between gasket and the tibial plateau. Or, vertical limit structure can also include elastic connecting piece, and elastic connecting piece connects between gasket and tibial plateau, and the elasticity locating part can restrict gasket and tibial plateau separation.

In order to facilitate the limiting function, as shown in fig. 1 to 6, in this embodiment, the limiting groove 41 is disposed on the side portion of the shim 20, the limiting block 42 is disposed on the side portion of the tibial platform 10, the limiting block 42 includes a connecting section 421 and a limiting section 422 connected to the connecting section 421, the limiting section 422 protrudes from the connecting section 421 and is inserted into the limiting groove 41, and the connecting section 421 is connected to the tibial platform 10. The position-limiting section 422 is used for limiting position, and the connecting section 421 is used for inserting the position-limiting section 422 into the position-limiting groove 41. Specifically, the outer side wall of the connecting section 421 is flush with the outer side wall of the tibial platform 10, so that the interference of the vertical limiting structure 40 with other structures can be effectively avoided, and the limiting section 422 extends towards the shim 20 so that the limiting section 422 and the limiting groove 41 can be plugged together.

In view of the limiting effect, as shown in fig. 1 to 6, in the present embodiment, the extending direction of the limiting groove 41 is parallel to the upper surface of the tibial plateau 10, and the limiting section 422 is parallel to the upper surface of the tibial plateau 10. The limiting groove 41 and the limiting section 422 are arranged in parallel, and the limiting groove 41 and the limiting section 422 are both parallel to the upper surface of the tibial platform 10, so that the limiting effect of the vertical limiting structure 40 can be effectively guaranteed, and the limiting section 422 is prevented from being separated from the limiting groove 41.

To facilitate the installation of the limiting block, as shown in fig. 1 to 6, in the present embodiment, the height of the groove wall of the limiting groove 41 close to the tibial plateau 10 is less than the height of the groove wall of the limiting groove 41 far from the tibial plateau 10, and the circumferential dimension S1 of the limiting groove 41 is greater than the circumferential dimension S2 of the limiting block 42, so that the limiting block 42 can slide in the limiting groove 41. The height of the groove wall of the limiting groove 41 close to the tibial platform 10 is smaller than the height of the groove wall of the limiting groove 41 far away from the tibial platform 10, so that the limiting section 422 is easily installed in the limiting groove 41, and the assembling difficulty is reduced. The circumferential dimension S1 of the limiting groove 41 is greater than the circumferential dimension S2 of the limiting block 42, so that the insert 20 has a certain rotation space on the tibial plateau 10, and further can be more adaptive to the movement of the human body.

In order to connect the shim and the tibial plateau, as shown in fig. 1 to 6, in the present embodiment, the plug connection structure 30 includes a first connection hole 31, a second connection hole 32, and a connection post 33 inserted into the first connection hole 31 and the second connection hole 32, and the connection post 33 is in plug-fit with the first connection hole 31 and the second connection hole 32. Specifically, a first coupling hole 31 is provided in tibial plateau 10 and a second coupling hole 32 is provided in insert 20. The attachment post 33 is inserted into the first and second attachment holes 31 and 32, which effectively couples the insert 20 and the tibial plateau 10 together. And in cooperation with the vertical stop 40, the insert 20 and tibial plateau 10 are effectively prevented from coming off.

As shown in fig. 1 to 6, in this embodiment, when the technical solution of this embodiment is assembled, the connection post 33 is first connected to the first connection hole 31, that is, the tibial plateau 10, and then the end of the connection post 33 is inserted into the second connection hole 32, which is not completely inserted into the second connection hole 32. The spacer 20 is tilted, the spacing segment 422 and the spacing groove 41 are inserted together, and then the spacer 20 is pressed down, so that the connecting column 33 is completely inserted into the second connecting hole 32.

In the embodiment not shown in the drawings, the wall of the limiting groove close to the tibial plateau is of a deformable structure, or the limiting section is of a deformable structure, so that the gasket is inserted into the connecting column in a manner of facing the connecting column during assembly, and the deformable structure deforms during pressing down, so that the assembly of the gasket and the tibial plateau is realized.

In an embodiment not shown in the drawings, the plug connection structure includes a first connection hole and a connection post penetrating through the first connection hole, and the first connection hole and the connection post are in plug fit. The first connecting hole is formed in the tibial platform, the connecting column is connected to the lower portion of the gasket, or the first connecting hole is formed in the gasket, and the connecting column is arranged on the upper surface of the tibial platform.

In order to avoid rotation between the connecting post and the tibial plateau, as shown in fig. 1-7, in this embodiment, the knee prosthesis further includes a limiting structure 50, and the limiting structure 50 is disposed between the tibial plateau 10 and the connecting post 33. The stop structure 50 limits rotation between the attachment post 33 and the tibial plateau 10.

As shown in fig. 1 to 7, in the present embodiment, the limiting structure 50 includes a convex portion 51 disposed on the connecting column 33 and a first concave portion 52 disposed on the tibial platform 10, and the convex portion 51 and the first concave portion 52 are inserted and matched, where the convex portion 51 is a polygonal structure and the first concave portion 52 is a polygonal hole. The installation of convex part 51 and then convex part 51 and first concave part 52 of being convenient for form spacing cooperation of being convenient for on the one hand is foretell to set up, and on the other hand, holistic simple structure is convenient for set up, and the simultaneous processing degree of difficulty is lower.

In order to make the overall structure more regular, as shown in fig. 1 to 7, in the present embodiment, the tibial plateau 10 is provided with a second recess 11, the second recess 11 is located above the first recess 52, and a projection of the second recess 11 on a horizontal plane is larger than a projection of the first recess 52 on the horizontal plane. The second recess 11 is configured to allow the protrusion 51 to be located therein, which effectively prevents the protrusion 51 from protruding from the tibial plateau 10 and interfering therewith.

As shown in fig. 1 to 7, in the present embodiment, the first concave portion 52 and the first connection hole 31 are correspondingly disposed, the first connection hole 31 is a through hole, the first connection hole 31 is internally provided with the first position-limiting portion 311, and the first concave portion 52 is located above the first position-limiting portion 311. The installation of spliced pole 33 is convenient for in the setting of through-hole to first spacing portion 311 can restrict the position of convex part 51 effectively, avoids convex part 51 to drop, and then makes the holistic stable in structure of knee joint prosthesis.

As shown in fig. 1 to 7, in the present embodiment, the connection column 33 includes a first section 331 located above the protruding portion 51 and a second section 332 located below the protruding portion 51, the first section 331 and the gasket 20 are in plug-in fit, the second section 332 and the first connection hole 31 are in interference fit, an outer surface of the first section 331 is a smooth surface, and the second section 332 is provided with a thread structure. The screw thread structure is convenient for cooperate with other structures, and the first section 331 is in insertion fit, in particular interference fit, with the gasket 20. Meanwhile, the smooth surface is convenient for splicing.

As shown in fig. 1 to 8, in this embodiment, the knee joint prosthesis further includes a plug 60, a threaded hole is formed on the plug 60, and the threaded hole is threadedly engaged with the second segment 332. The plug 60 can plug the through hole below the tibial plateau 10, and meanwhile, the plug 60 can be connected to the threaded structure in a replaceable manner, so that the plug can be used for a patient in a targeted manner, namely, the stability after implantation can be ensured.

As shown in fig. 1 to 8, in the present embodiment, a second limiting portion 61 is disposed on an outer wall of the plug 60, a part of the plug 60 is inserted into the first connecting hole 31, and the second limiting portion 61 is abutted and matched with the tibial plateau 10. The second limiting portion 61 can connect the tibial platform 10, the connecting column 33 and the plug 60 into a whole, so that the whole is more stable.

As shown in fig. 1 to 8, in the present embodiment, the material of the gasket 20 is ultra-high molecular weight polyethylene or highly cross-linked polyethylene, and the remaining components are made of metal or ceramic. The lower surface of the spacer 20 is provided with a circular hole structure, i.e., a second coupling hole 32. The second connecting hole 32 is matched with the polished part of the connecting column 33, namely the smooth surface of the first section 331, so as to form a revolute pair. A limiting groove 41 is arranged below the front edge of the gasket 20, the limiting groove 41 is matched with a limiting block 42, and a rear extending structure at the upper end of the limiting block 42 is inserted into the limiting groove 41; when the shim 20 and the tibial platform 10 perform relative rotational movement, the limiting groove 41 and the upper end extending structure of the limiting block 42 perform relative sliding, and limit the relative sliding range, thereby performing a limiting function. The upper half part of the connecting column 33 is of a cylindrical structure, the middle part of the connecting column is of a hexagonal structure, and the lower part of the connecting column is of a threaded structure. The surface of the cylindrical structure is subjected to high polishing treatment and is matched with the circular hole structure on the lower surface of the gasket 20 to form a revolute pair. The hexagonal structure is assembled with the stepped hexagonal structure of the tibial plateau, and plays a role in preventing the connecting column 33 and the tibial plateau 10 from rotating relatively. The thread structure of the screw passes through the round through hole under the right hexagon of the tibial platform 10 and is matched with the thread of the plug 60 to form threaded connection, so that the connecting column 33 and the plug 60 are mutually fastened. The upper surface of the tibial plateau 10 is provided with a step type hexagonal structure, and the front edge of the upper surface is provided with a limit table structure. The step type hexagonal structure is divided into an upper part and a lower part, and the upper part is a long hexagonal structure with larger front-back distance and smaller left-right distance; the lower part is in a regular hexagonal structure. After the round hole of the gasket 20 is matched with the connecting column 33, the hexagonal structure of the connecting column 33 slides into the lower hexagonal structure through the upper long hexagonal structure; the hexagonal structure of the connecting column 33 is matched with the lower part of the tibial plateau to prevent relative rotation. A long round through hole is arranged below the regular hexagonal structure and is communicated with a rod part round hole of the tibial plateau 10; the hexagonal structure of the connecting column 33 slides into the lower hexagonal structure through the upper hexagonal structure, and the connecting column 33 enters the round hole of the tibial plateau rod part through the oblong hole; the threaded structure of the connecting column 33 is matched with the threads of the plug 60 to form threaded connection, so that the connecting column 33 and the plug 60 are fastened with each other. The plug 60 includes a shaft portion and a post portion. The post has a threaded structure that mates with the post threaded structure that enters the rod portion circular hole of tibial plateau 10 through the oblong hole to form a threaded connection, securing connecting post 33 and plug 60 to each other. The plug 60 upright post is in clearance fit with the round hole part of the tibial plateau rod part so as to realize the assembly of the connecting column 33 and the plug 60 upright post thread.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A knee joint prosthesis, comprising:

a tibial plateau (10);

a shim (20) movably disposed on the tibial plateau (10);

a plug-in connection (30) arranged between the tibial plateau (10) and the shim (20);

the vertical limiting structure (40) is arranged between the tibial platform (10) and the gasket (20) so as to keep the vertical position between the tibial platform (10) and the gasket (20) unchanged and enable the gasket (20) and the tibial platform (10) to rotate mutually.

2. The knee joint prosthesis according to claim 1, wherein the vertical stopper structure (40) includes a stopper groove (41) and a stopper (42), the stopper (42) is inserted into the stopper groove (41), one of the stopper groove (41) and the stopper (42) is disposed on the tibial plateau (10), and the other of the stopper groove (41) and the stopper (42) is disposed on the spacer (20).

3. The knee joint prosthesis according to claim 2, wherein the retaining groove (41) is provided at a side portion of the spacer (20), the retaining block (42) is provided at a side portion of the tibial plateau (10), the retaining block (42) includes a connecting section (421) and a retaining section (422) connected to the connecting section (421), the retaining section (422) protrudes from the connecting section (421) and is inserted into the retaining groove (41), and the connecting section (421) is connected to the tibial plateau (10).

4. The knee joint prosthesis according to claim 3, characterized in that the direction of extension of the retaining groove (41) is arranged parallel to the upper surface of the tibial plateau (10), and the retaining segment (422) is arranged parallel to the upper surface of the tibial plateau (10).

5. The knee joint prosthesis according to claim 2, characterized in that the height of the retaining groove (41) close to the groove wall of the tibial plateau (10) is smaller than the height of the retaining groove (41) away from the groove wall of the tibial plateau (10), and/or the circumferential dimension (S1) of the retaining groove (41) is larger than the circumferential dimension (S2) of the retaining block (42), so that the retaining block (42) can slide within the retaining groove (41).

6. The knee joint prosthesis according to claim 1, wherein the plug connection structure (30) comprises a first connection hole (31) and a connection column (33) penetrating into the first connection hole (31), the first connection hole (31) and the connection column (33) being in plug fit; or, grafting connection structure (30) include first connecting hole (31), second connecting hole (32) and wear to establish in first connecting hole (31) with spliced pole (33) in second connecting hole (32), spliced pole (33) with first connecting hole (31) and second connecting hole (32) cooperation of pegging graft.

7. The knee joint prosthesis according to claim 6, further comprising a stop structure (50), the stop structure (50) being disposed between the tibial plateau (10) and the attachment post (33).

8. The knee joint prosthesis according to claim 7, wherein the limiting structure (50) comprises a convex portion (51) provided on the connecting column (33) and a first concave portion (52) provided on the tibial plateau (10), the convex portion (51) and the first concave portion (52) are in a plug-fit, wherein the convex portion (51) has a polygonal structure, and the first concave portion (52) has a polygonal hole.

9. Knee joint prosthesis according to claim 8, characterized in that a second recess (11) is provided on the tibial plateau (10), the second recess (11) being located above the first recess (52), the projection of the second recess (11) in the horizontal plane being larger than the projection of the first recess (52) in the horizontal plane.

10. The knee joint prosthesis according to claim 8, wherein the first recess (52) and the first connection hole (31) are correspondingly arranged, the first connection hole (31) is a through hole, a first position-limiting portion (311) is arranged in the first connection hole (31), and the first recess (52) is located above the first position-limiting portion (311).

11. The knee joint prosthesis according to claim 8, wherein the connecting column (33) comprises a first section (331) located above the convex portion (51) and a second section (332) located below the convex portion (51), the first section (331) is in plug-in fit with the gasket (20), the second section (332) is in interference fit with the first connecting hole (31), the outer surface of the first section (331) is a smooth surface, and a thread structure is arranged on the second section (332).

12. The knee joint prosthesis according to claim 11, further comprising a plug (60), wherein a threaded hole is provided in the plug (60), and the threaded hole and the second segment (332) are threadedly engaged.

13. The knee joint prosthesis according to claim 12, wherein a second limiting portion (61) is arranged on the outer wall of the plug (60), part of the structure of the plug (60) is inserted into the first connecting hole (31), and the second limiting portion (61) is in abutting fit with the tibial plateau (10).

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