Tibial prosthesis

Abstract

The application provides a tibial prosthesis, which comprises: a tibial platform comprising a base plate and a mounting table arranged on the lower surface of the base plate; an extension rod comprising a rod body and a cone table arranged on the upper end of the rod body, the mounting table is provided with a tapered hole, the cone table is arranged in the tapered hole and matched with the tapered surface of the tapered hole, the cross-sectional size of the tapered hole and the cross-sectional size of the cone table are gradually reduced in the upward direction; a ring-shaped prosthesis is arranged outside the mounting table and the extension rod, the ring-shaped prosthesis and the extension rod are screw-threaded, when the ring-shaped prosthesis rotates forward relative to the extension rod, the ring-shaped prosthesis moves upward relative to the extension rod, and the upper end of the ring-shaped prosthesis can abut against the base plate; a locking structure can limit the reverse rotation of the ring-shaped prosthesis relative to the extension rod when the upper end of the ring-shaped prosthesis abuts against the base plate. Through the technical scheme provided in the application, the problem of poor stability of the tibial prosthesis in the related art can be solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a tibial prosthesis. Background Technology

[0002] Joint replacement surgery (TJA) can effectively eliminate patient pain and correct joint deformities, restoring patient mobility. Knee joint prostheses include femoral prostheses connected to the femur and tibial prostheses connected to the tibia. In clinical observation of joint replacement surgery, the stability of the tibial prosthesis implanted on the tibial side affects the lifespan of the entire knee joint prosthesis.

[0003] In related technologies, tibial prostheses include a tibial plateau, a ring prosthesis, and an extension rod. A post is provided on one side of the tibial plateau, and the ring prosthesis is fitted onto the post. The ring prosthesis and the post together extend into the medullary cavity of the patient's tibia.

[0004] However, among related technologies, tibial prostheses have relatively poor stability. Summary of the Invention

[0005] This invention provides a tibial prosthesis to solve the problem of poor stability of tibial prostheses in related technologies.

[0006] This invention provides a tibial prosthesis, comprising: a tibial platform including a base plate and a mounting platform disposed on the lower surface of the base plate; an extension rod including a rod body and a frustum disposed at the upper end of the rod body, the mounting platform having a conical hole, the frustum passing through the conical hole and engaging with the conical surface of the conical hole, the cross-sectional dimensions of the conical hole and the frustum both gradually decreasing from top to bottom; an annular prosthesis sleeved on the outside of the mounting platform and the rod body, the annular prosthesis and the rod body being threadedly engaged, when the annular prosthesis rotates forward relative to the rod body, the annular prosthesis moves upward relative to the rod body, and the upper end of the annular prosthesis can abut against the base plate; and a locking structure that, when the upper end of the annular prosthesis abuts against the base plate, restricts the reverse rotation of the annular prosthesis relative to the rod body.

[0007] Furthermore, an inner conical surface is provided on the inner sidewall of the annular prosthesis, and an outer conical surface is provided on the outer sidewall of the mounting platform. The inner and outer conical surfaces fit together, and the cross-sectional dimensions of the inner and outer conical surfaces gradually decrease from top to bottom.

[0008] Furthermore, the outer conical surface extends circumferentially along the rod.

[0009] Furthermore, the locking structure includes: a first locking tooth disposed on the lower surface of the substrate; and a second locking tooth disposed on the upper end face of the annular prosthesis. When the inner conical surface and the outer conical surface abut against each other, and the upper end of the annular prosthesis abuts against the substrate, the first locking tooth and the second locking tooth engage to restrict the reverse rotation of the annular prosthesis relative to the rod.

[0010] Furthermore, both the first locking tooth and the second locking tooth have a reverse tooth structure. The tip of the first locking tooth is inclined in the direction of forward rotation relative to the bottom of the first locking tooth, and the tip of the second locking tooth is inclined in the direction of reverse rotation relative to the bottom of the second locking tooth.

[0011] Furthermore, the first locking tooth and / or the second locking tooth are toothed ring structures extending circumferentially along the rod body.

[0012] Furthermore, the tapered hole penetrates the substrate and the mounting stage.

[0013] Furthermore, a tool interface is provided on the outer wall of the annular prosthesis; and / or, a porous structure is provided on the outer wall of the annular prosthesis.

[0014] Furthermore, the cross-sectional shape of the annular prosthesis includes standard, anatomical, and patient-matched types; and / or, the cross-sectional dimensions of the lateral wall of the annular prosthesis gradually decrease from top to bottom.

[0015] Furthermore, the annular prosthesis is made using 3D printing; the lower end of the extension rod is tapered; and both the tibial plateau and the rod body are forged from metal.

[0016] The tibial prosthesis of this invention includes a tibial plateau, an extension rod, an annular prosthesis, and a locking structure. A frustum is inserted into a conical hole, allowing the frustum and the conical surface of the hole to mate. The annular prosthesis is then fitted onto the outside of the mounting platform and the rod. The annular prosthesis is rotated forward relative to the rod, moving upward relative to the rod, with its upper end abutting against the base plate. The fit between the frustum and the conical surface of the hole becomes tighter. At this point, the locking structure restricts the reverse rotation of the annular prosthesis relative to the rod, thereby limiting the contact between the annular prosthesis and the base plate, as well as the fit between the frustum and the conical surface of the hole. This achieves self-locking between the tibial plateau, the extension rod, and the annular prosthesis, improving the stability of the tibial prosthesis. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a tibial prosthesis provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A front view of a tibial prosthesis provided according to an embodiment of the present invention is shown;

[0020] Figure 3A cross-sectional view of a tibial prosthesis provided according to an embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram of the tibial platform and extension rod of the tibial prosthesis provided according to an embodiment of the present invention is shown;

[0022] Figure 5 A schematic diagram of the structure of a ring-shaped tibial prosthesis provided according to an embodiment of the present invention is shown;

[0023] Figure 6 A cross-sectional view of a ring-shaped tibial prosthesis provided according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic diagram of the tibial platform of a tibial prosthesis provided according to an embodiment of the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Tibial plateau; 11. Base plate; 111. Locking structure; 112. Locking hole; 12. Mounting platform; 121. Conical hole; 122. Outer conical surface;

[0027] 20. Extension rod; 21. Rod body; 22. Frustum;

[0028] 30. Circular prosthesis; 31. Inner conical surface; 32. Tool interface; 33. Porous structure;

[0029] 40. Locking structure; 41. First locking tooth; 42. Second locking tooth. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7As shown, this embodiment of the invention provides a tibial prosthesis, which includes a tibial platform 10, an extension rod 20, a ring-shaped prosthesis 30, and a locking structure 40. The tibial platform 10 includes a base plate 11 and a mounting platform 12 disposed on the lower surface of the base plate 11. The extension rod 20 includes a rod body 21 and a frustum 22 disposed at the upper end of the rod body 21. The mounting platform 12 is provided with a conical hole 121, and the frustum 22 passes through the conical hole 121 and mates with the conical surface of the conical hole 121. The cross-sectional dimensions of the conical hole 121 and the frustum are... The cross-sectional dimensions of 22 gradually decrease from top to bottom. The annular prosthesis 30 is sleeved on the outside of the mounting platform 12 and the rod 21. The annular prosthesis 30 and the rod 21 are threaded together. When the annular prosthesis 30 rotates in the forward direction relative to the rod 21, the annular prosthesis 30 moves upward relative to the rod 21. The upper end of the annular prosthesis 30 can abut against the base plate 11. When the upper end of the annular prosthesis 30 abuts against the base plate 11, the locking structure 40 can restrict the reverse rotation of the annular prosthesis 30 relative to the rod 21.

[0032] Using the tibial prosthesis provided in this embodiment, the frustum 22 is inserted into the conical hole 121, so that the frustum 22 and the conical surface of the conical hole 121 are engaged. Then, the annular prosthesis 30 is sleeved on the outside of the mounting platform 12 and the rod 21. The annular prosthesis 30 is rotated forward relative to the rod 21, and the annular prosthesis 30 moves upward relative to the rod 21. The upper end of the annular prosthesis 30 abuts against the base plate 11, and the engagement between the frustum 22 and the conical surface of the conical hole 121 is tighter. At this time, the locking structure 40 is used to restrict the reverse rotation of the annular prosthesis 30 relative to the rod 21. Thus, the locking structure 40 restricts the abutment between the annular prosthesis 30 and the base plate 11 and the engagement between the frustum 22 and the conical surface of the conical hole 121, thereby achieving self-locking between the tibial platform 10, the extension rod 20 and the annular prosthesis 30 of the tibial prosthesis, improving the stability of the tibial prosthesis.

[0033] The frustum 22 includes the following two structures:

[0034] (1) The frustum 22 is continuous in the circumferential direction of the rod 21;

[0035] (2) The frustum 22 is discontinuous in the circumferential direction of the rod 21.

[0036] The mounting platform 12 is provided with a conical hole 121, which includes the following two structures:

[0037] (1) The tapered hole 121 is set on the mounting platform 12 but does not penetrate the mounting platform 12;

[0038] (2) The tapered hole 121 is set on the mounting platform 12 and passes through the mounting platform 12.

[0039] like Figure 6 and Figure 7As shown, an inner conical surface 31 is provided on the inner sidewall of the annular prosthesis 30, and an outer conical surface 122 is provided on the outer sidewall of the mounting platform 12. The inner conical surface 31 and the outer conical surface 122 are in conical contact, and the cross-sectional dimensions of the inner conical surface 31 and the outer conical surface 122 gradually decrease from top to bottom. The annular prosthesis 30 is rotated forward relative to the rod 21, and the annular prosthesis 30 moves upward relative to the rod 21. The conical surfaces of the inner conical surface 31 and the outer conical surface 122 fit more tightly, and the conical surfaces of the frustum 22 and the conical hole 121 fit more tightly. The upper end of the annular prosthesis 30 abuts against the base plate 11, and the locking structure 40 restricts the reverse rotation of the annular prosthesis 30 relative to the rod 21. Thus, the locking structure 40 restricts the abutment of the annular prosthesis 30 against the base plate 11, the conical surface fit of the inner conical surface 31 and the outer conical surface 122, and the conical surface fit of the frustum 22 and the conical hole 121, so that the tibial plateau 10, the extension rod 20, and the annular prosthesis 30 of the tibial prosthesis achieve self-locking, thereby improving the stability of the tibial prosthesis.

[0040] The outer conical surface 122 includes the following two structures:

[0041] (1) The outer conical surface 122 is continuous in the circumferential direction of the rod body 21;

[0042] (2) The outer cone surface 122 is discontinuous in the circumferential direction of the rod 21.

[0043] like Figure 6 As shown, the outer conical surface 122 extends circumferentially along the rod 21. By using the aforementioned outer conical surface 122, the circumferential dimension of the outer conical surface 122 in the rod 21 can be increased, thereby increasing the contact area between the inner conical surface 31 and the outer conical surface 122, reducing the pressure between the inner conical surface 31 and the outer conical surface 122, and improving the structural strength of the inner conical surface 31 and the outer conical surface 122.

[0044] like Figure 4 and Figure 5As shown, the locking structure 40 includes a first locking tooth 41 and a second locking tooth 42. The first locking tooth 41 is disposed on the lower surface of the substrate 11, and the second locking tooth 42 is disposed on the upper end surface of the annular prosthesis 30. When the inner conical surface 31 and the outer conical surface 122 abut against each other, and the upper end of the annular prosthesis 30 abuts against the substrate 11, the first locking tooth 41 and the second locking tooth 42 engage to restrict the reverse rotation of the annular prosthesis 30 relative to the rod 21. When the annular prosthesis 30 is rotated forward relative to the rod 21, the annular prosthesis 30 moves upward relative to the rod 21. When the upper end of the annular prosthesis 30 abuts against the base plate 11, the first locking tooth 41 and the second locking tooth 42 engage to restrict the reverse rotation of the annular prosthesis 30 relative to the rod 21. The locking structure 40 restricts the abutment between the annular prosthesis 30 and the base plate 11, the conical engagement between the inner conical surface 31 and the outer conical surface 122, and the conical engagement between the frustum 22 and the conical hole 121, so that the tibial plateau 10, the extension rod 20, and the annular prosthesis 30 of the tibial prosthesis achieve self-locking, thereby improving the stability of the tibial prosthesis.

[0045] In this embodiment, both the first locking tooth 41 and the second locking tooth 42 are reverse-tooth structures. The tip of the first locking tooth 41 is inclined relative to the root of the first locking tooth 41 in the direction of forward rotation, and the tip of the second locking tooth 42 is inclined relative to the root of the second locking tooth 42 in the direction of reverse rotation. With the aforementioned reverse-tooth structure of the first locking tooth 41 and the second locking tooth 42, when the first locking tooth 41 and the second locking tooth 42 are engaged, the annular prosthesis 30 can be further rotated in the forward direction relative to the rod 21, but the annular prosthesis 30 cannot be rotated in the reverse direction relative to the rod 21. This further improves the clamping degree of the conical surface fit between the inner conical surface 31 and the outer conical surface 122, further improves the clamping degree of the conical surface fit between the frustum 22 and the conical hole 121, and thus improves the stability of the tibial prosthesis.

[0046] like Figure 4 and Figure 5 As shown, the first locking tooth 41 and / or the second locking tooth 42 are toothed ring structures extending circumferentially along the rod 21, which increases the circumferential dimensions of the first locking tooth 41 and / or the second locking tooth 42 on the rod 21 and improves the structural strength of the locking structure 40.

[0047] The first locking tooth 41 and / or the second locking tooth 42 are toothed ring structures extending circumferentially along the rod body 21, including the following three structures:

[0048] (1) The first locking tooth 41 is a toothed ring structure that extends circumferentially along the rod 21;

[0049] (2) The second locking tooth 42 is a toothed ring structure that extends circumferentially along the rod 21;

[0050] (3) Both the first locking tooth 41 and the second locking tooth 42 are tooth ring structures that extend circumferentially along the rod 21.

[0051] Specifically, in this embodiment, the first locking tooth 41 and the second locking tooth 42 are both toothed ring structures extending circumferentially along the rod 21, thereby increasing the circumferential dimensions of the first locking tooth 41 and the second locking tooth 42 on the rod 21 and improving the structural strength of the locking structure 40.

[0052] In this embodiment, the tapered hole 121 penetrates the substrate 11 and the mounting platform 12. This increases the axial dimension of the tapered hole 121 on the rod 21, thereby improving the area and structural strength of the tapered hole 121.

[0053] In other embodiments, the tapered hole 121 penetrates the mounting stage 12 and extends onto the substrate 11, and the tapered hole 121 does not penetrate the substrate 11.

[0054] like Figure 2 As shown, a tool interface 32 is provided on the outer wall of the annular prosthesis 30. By using a special tool in conjunction with the tool interface 32, it is convenient to rotate the annular prosthesis 30.

[0055] like Figure 2 As shown, the outer wall of the annular prosthesis 30 is provided with a porous structure 33, which is conducive to the ingrowth of autologous bone into the porous structure 33 and improves the long-term stability of the annular prosthesis 30.

[0056] The annular prosthesis 30 has cross-sectional shapes including standard, anatomical, and patient-matched types. The thickness of the annular prosthesis 30 can be selected according to the size of the patient's tibial medullary cavity, and the cross-sectional shape of the annular prosthesis 30 can be selected according to the shape of the patient's tibial medullary cavity. This achieves a proper fit between the annular prosthesis 30 and the patient's tibial medullary cavity, improving the short-term stability of the annular prosthesis 30 while also providing a suitable mechanical environment for long-term bone ingrowth into the porous structure 33.

[0057] like Figure 2 As shown, the cross-sectional dimensions of the lateral wall of the annular prosthesis 30 gradually decrease from top to bottom. The annular prosthesis 30 with this structure restricts its subsidence within the medullary cavity of the patient's tibia, improving its short-term stability while also providing a suitable mechanical environment for long-term bone ingrowth into the porous structure 33.

[0058] In this embodiment, the annular prosthesis 30 is made using 3D printing.

[0059] like Figure 1 As shown, the lower end of the rod 21 is tapered, which restricts the rod 21 from sinking into the medullary cavity of the patient's tibia, improves the short-term stability of the rod 21, and facilitates the insertion of the rod 21 into the medullary cavity of the patient's tibia.

[0060] In this embodiment, both the tibial plateau 10 and the extension rod 20 are forged from metal materials, giving them good structural strength.

[0061] like Figure 1 As shown, the tibial plateau 10 also includes a gasket, and a locking structure 111 is provided on the base plate 11. The outer edge of the gasket is connected to the locking structure 111. The base plate 11 is also provided with a plurality of locking holes 112. The fastener passes through the gasket and locks with the locking hole 112. The locking method between the fastener and the locking hole 112 is not limited to threaded engagement, tapered engagement, etc.

[0062] The tibial platform provided in this embodiment has the following beneficial effects:

[0063] (1) Rotate the annular prosthesis 30 in the forward direction relative to the rod 21. Move the annular prosthesis 30 upward relative to the rod 21. The conical surfaces of the inner conical surface 31 and the outer conical surface 122 fit more tightly. The conical surfaces of the frustum 22 and the conical hole 121 fit more tightly. The upper end of the annular prosthesis 30 abuts against the base plate 11. And use the locking structure 40 to restrict the reverse rotation of the annular prosthesis 30 relative to the rod 21. Thus, the locking structure 40 restricts the abutment of the annular prosthesis 30 against the base plate 11, the conical surface fit of the inner conical surface 31 and the outer conical surface 122, and the conical surface fit of the frustum 22 and the conical hole 121. This makes the tibial plateau 10, the extension rod 20 and the annular prosthesis 30 self-locking, thereby improving the stability of the tibial prosthesis.

[0064] (2) The first locking tooth 41 and the second locking tooth 42 with the reverse tooth structure can further rotate the annular prosthesis 30 relative to the rod 21 in the forward direction when the first locking tooth 41 and the second locking tooth 42 are engaged, but cannot rotate the annular prosthesis 30 relative to the rod 21 in the reverse direction. This can further improve the pressing degree of the conical surface fit between the inner conical surface 31 and the outer conical surface 122, further improve the pressing degree of the conical surface fit between the frustum 22 and the conical hole 121, and thus improve the stability of the tibial prosthesis.

[0065] (3) Using a special tool and tool interface 32, it is convenient to rotate the annular prosthesis 30;

[0066] (4) The cross-sectional shape of the annular prosthesis 30 includes standard type, anatomical type and patient-matched type. The thickness of the annular prosthesis 30 can be selected according to the size of the medullary cavity of the patient's tibia. The cross-sectional shape of the annular prosthesis 30 can be selected according to the shape of the medullary cavity of the patient's tibia, so as to achieve a proper fit between the annular prosthesis 30 and the medullary cavity of the patient's tibia, improve the short-term stability of the annular prosthesis 30, and provide a suitable mechanical environment for the long-term bone ingrowth into the porous structure 33.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0069] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tibial prosthesis, characterized in that, The tibial prosthesis includes: Tibial platform (10) includes a base plate (11) and a mounting platform (12) disposed on the lower surface of the base plate (11). The extension rod (20) includes a rod body (21) and a truncated cone (22) disposed at the upper end of the rod body (21). A conical hole (121) is provided on the mounting platform (12). The truncated cone (22) passes through the conical hole (121) and mates with the conical surface of the conical hole (121). The cross-sectional dimensions of the conical hole (121) and the cross-sectional dimensions of the truncated cone (22) gradually decrease from top to bottom. An annular prosthesis (30) is fitted on the outside of the mounting platform (12) and the rod (21). The annular prosthesis (30) and the rod (21) are threaded together. When the annular prosthesis (30) rotates in the forward direction relative to the rod (21), the annular prosthesis (30) moves upward relative to the rod (21), and the upper end of the annular prosthesis (30) can abut against the base plate (11). The locking structure (40) can restrict the reverse rotation of the annular prosthesis (30) relative to the rod (21) when the upper end of the annular prosthesis (30) abuts against the base plate (11); The locking structure (40) includes a first locking tooth (41) and a second locking tooth (42). The first locking tooth (41) is disposed on the lower surface of the substrate (11), and the second locking tooth (42) is disposed on the upper end surface of the annular prosthesis (30). The truncated cone (22) engages with and abuts against the conical surface of the conical hole (121). When the upper end of the annular prosthesis (30) abuts against the substrate (11), the first locking tooth (41) and the second locking tooth (42) mesh to restrict the reverse rotation of the annular prosthesis (30) relative to the rod (21). The first locking tooth (41) and / or the second locking tooth (42) are toothed ring structures extending circumferentially along the rod (21).

2. The tibial prosthesis according to claim 1, characterized in that, The inner wall of the annular prosthesis (30) is provided with an inner conical surface (31), and the outer wall of the mounting platform (12) is provided with an outer conical surface (122). The inner conical surface (31) and the outer conical surface (122) are conically matched. The cross-sectional dimensions of the inner conical surface (31) and the outer conical surface (122) gradually decrease from top to bottom.

3. The tibial prosthesis according to claim 2, characterized in that, The outer conical surface (122) extends circumferentially along the rod (21).

4. The tibial prosthesis according to claim 2, characterized in that, Both the first locking tooth (41) and the second locking tooth (42) are reverse tooth structures. The tooth tip of the first locking tooth (41) is inclined relative to the tooth base of the first locking tooth (41) in the direction of forward rotation, and the tooth tip of the second locking tooth (42) is inclined relative to the tooth base of the second locking tooth (42) in the direction of reverse rotation.

5. The tibial prosthesis according to any one of claims 1 to 4, characterized in that, The conical hole (121) penetrates the substrate (11) and the mounting platform (12).

6. The tibial prosthesis according to any one of claims 1 to 4, characterized in that, A tool interface (32) is provided on the outer wall of the annular prosthesis (30); and / or, The outer wall of the annular prosthesis (30) is provided with a porous structure (33).

7. The tibial prosthesis according to any one of claims 1 to 4, characterized in that, The cross-sectional shape of the annular prosthesis (30) includes standard, anatomical, and patient-matched types; and / or, The cross-sectional dimensions of the outer wall of the annular prosthesis (30) gradually decrease from top to bottom.

8. The tibial prosthesis according to any one of claims 1 to 4, characterized in that, The annular prosthesis (30) is made using 3D printing; The lower end of the rod (21) is tapered; Both the tibial platform (10) and the extension rod (20) are forged from metal materials.

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