CN113827378A

CN113827378A - Ankle joint tibia side prosthesis

Info

Publication number: CN113827378A
Application number: CN202111398609.5A
Authority: CN
Inventors: 张帅; 王好奎
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2021-12-24
Anticipated expiration: 2041-11-24
Also published as: CN113827378B

Abstract

The invention provides an ankle joint tibia side prosthesis, which comprises: the prosthesis body comprises a bottom plate, a front side plate and a rear side plate, wherein the front side plate is arranged on the front side of the bottom plate, and the rear side plate is arranged on the rear side of the bottom plate; the connecting assembly comprises two connecting pieces, the two connecting pieces are arranged above the bottom plate at intervals, one end of each connecting piece is connected with the front side plate, the other end of each connecting piece is connected with the rear side plate, and the length of each connecting piece is adjustable. Through the technical scheme that this application provided, can solve the fixed degree of difficulty of shin bone distal end of shin bone side false body and patient's osteotomy among the correlation technique big, the problem of dislocation easily takes place.

Description

Ankle joint tibia side prosthesis

Technical Field

The invention relates to the technical field of prostheses, in particular to an ankle joint tibia side prosthesis.

Background

The ankle joint is composed of the far end of the talus, the far end of the tibia and the lower end of the fibula, and is the joint with the largest load of the human body. The pathological changes of the ankle joint can cause difficulty in walking, serious patients and even disability of the patients. The artificial ankle joint replacement is one of the main diagnosis and treatment methods for reconstructing the structure and the function of the ankle joint. The ankle joint prosthesis includes a tibial side prosthesis and a talar side prosthesis. Wherein, the ankle joint tibia side prosthesis is used for ankle joint replacement after ankle joint tibia side lesion.

In the related art, the tibia lateral prosthesis is difficult to fix with the tibia far end of the osteotomy of the patient, and dislocation is easy to occur.

Disclosure of Invention

The invention provides an ankle joint tibia side prosthesis, which aims to solve the problems that in the related art, the tibia side prosthesis and a tibia far end of a patient osteotomy are difficult to fix and are easy to dislocate.

The invention provides an ankle joint tibia side prosthesis, which comprises: the prosthesis body comprises a bottom plate, a front side plate and a rear side plate, wherein the front side plate is arranged on the front side of the bottom plate, and the rear side plate is arranged on the rear side of the bottom plate; the connecting assembly comprises two connecting pieces, the two connecting pieces are arranged above the bottom plate at intervals, one end of each connecting piece is connected with the front side plate, the other end of each connecting piece is connected with the rear side plate, and the length of each connecting piece is adjustable.

Further, the front side plate is provided with two first connecting holes arranged at intervals, the rear side plate is provided with two second connecting holes arranged at intervals, and two ends of the connecting piece are connected with the first connecting holes and the second connecting holes respectively.

Further, the connecting piece includes screw rod and gland nut, and gland nut sets up in the second connecting hole, and the first end and the first connecting hole of screw rod are connected, and the second end of screw rod is provided with the external screw thread and with gland nut threaded connection.

Further, the ankle joint shin bone side prosthesis still includes the inside lining, and the inside lining setting is provided with joint structure at the lower extreme of bottom plate between bottom plate and the inside lining, and bottom plate and inside lining pass through joint structure and can dismantle the connection.

Further, the clamping structure includes: the dovetail groove is arranged on the lower surface of the bottom plate and extends from front to back; the clamping boss is arranged on the upper surface of the lining and is in clamping fit with the dovetail groove.

Furthermore, the front end of the dovetail groove is of an open structure, the rear end of the dovetail groove is of a closed structure, blocking ribs are arranged at the open structure, two ends of each blocking rib are respectively connected with two sides of the open structure, and the height of each blocking rib is smaller than the depth of the dovetail groove.

Further, the width dimension of the dovetail groove gradually decreases in the front-to-rear direction.

Furthermore, a guide rib is arranged in the dovetail groove, the rear end of the guide rib is connected with the rear end of the dovetail groove, the front end of the guide rib extends forwards, and the width dimension of the guide rib is kept unchanged.

Further, the rear end of the compression nut is flush with the outer side wall of the rear side plate, or the rear end of the compression nut is recessed in the outer side wall of the rear side plate; and/or the front end of the compression nut protrudes out of the inner side wall of the rear side plate.

Furthermore, the front side plate is an arc-shaped plate; and/or the rear side plate is a flat plate.

By applying the technical scheme, the ankle joint tibia side prosthesis comprises a prosthesis body and a connecting assembly, wherein the prosthesis body comprises a bottom plate, a front side plate and a rear side plate, the front side plate is arranged on the front side of the bottom plate, the rear side plate is arranged on the rear side of the bottom plate, the connecting assembly comprises two connecting pieces, the two connecting pieces are arranged above the bottom plate at intervals, one ends of the connecting pieces are connected with the front side plate, the other ends of the connecting pieces are connected with the rear side plate, and the lengths of the connecting pieces are adjustable. Adopt the ankle joint shin bone side false body of above-mentioned structure, install the false body in the shin bone distal end that the patient cut the bone, preceding curb plate and posterior lateral plate correspond the front side and the rear side of patient's shin bone respectively, and the bottom plate corresponds the talus side of patient's shin bone, and the one end and the preceding curb plate of two connecting pieces are connected, and the other end and the posterior lateral plate of two connecting pieces are connected. Adopt two connecting pieces to be connected the prosthesis body with the shin bone distal end, can effectively strengthen the joint strength of prosthesis body and shin bone distal end, through the length of adjusting the connecting piece, make the interference fit of anterior lateral plate and posterior lateral plate and the shin bone distal end of prosthesis body, and then reinforcing shin bone side prosthesis and the fixed fastness of the shin bone distal end that the patient cut the bone, make the difficult emergence dislocation of ankle joint shin bone side prosthesis.

Drawings

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

FIG. 1 illustrates a schematic structural view of an ankle tibial side prosthesis provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a side view of an ankle tibial side prosthesis provided in accordance with an embodiment of the present invention;

FIG. 3 shows an isometric view of the prosthesis body of FIG. 1;

FIG. 4 shows a top view of the prosthesis body of FIG. 1;

FIG. 5 shows a bottom view of the prosthesis body of FIG. 1;

FIG. 6 shows a schematic view of the screw of FIG. 1;

fig. 7 shows a schematic structural view of the compression nut of fig. 1.

Wherein the figures include the following reference numerals:

10. a prosthesis body; 11. a base plate; 111. a dovetail groove; 12. a front side plate; 121. a first connection hole; 122. an arc-shaped plate; 13. a rear side plate; 131. a second connection hole; 132. a flat plate;

20. a connecting assembly; 21. a connecting member; 211. a screw; 212. a compression nut;

30. an open structure; 31. blocking ribs; 32. a closed structure; 33. a guide rib;

H. the height of the front and rear side panels; A. the distance between the outer edge of the dovetail groove and the outer edge of the bottom plate; B. the two side walls of the bottom plate form an included angle.

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 invention, 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.

As shown in fig. 1 to 7, an embodiment of the present invention provides an ankle tibia side prosthesis, which includes a prosthesis body 10 and a connecting assembly 20, wherein the prosthesis body 10 includes a bottom plate 11, an anterior side plate 12 and a posterior side plate 13, the anterior side plate 12 is disposed on an anterior side of the bottom plate 11, the posterior side plate 13 is disposed on a posterior side of the bottom plate 11, the connecting assembly 20 includes two connecting elements 21, the two connecting elements 21 are disposed above the bottom plate 11 at intervals, one end of each connecting element 21 is connected to the anterior side plate 12, the other end of each connecting element 21 is connected to the posterior side plate 13, and the length of each connecting element 21 is adjustable.

By applying the technical scheme of the invention, the ankle joint tibia side prosthesis comprises a prosthesis body 10 and a connecting assembly 20, wherein the prosthesis body 10 comprises a bottom plate 11, an anterior side plate 12 and a posterior side plate 13, the anterior side plate 12 is arranged on the anterior side of the bottom plate 11, the posterior side plate 13 is arranged on the posterior side of the bottom plate 11, the connecting assembly 20 comprises two connecting pieces 21, the two connecting pieces 21 are arranged above the bottom plate 11 at intervals, one ends of the connecting pieces 21 are connected with the anterior side plate 12, the other ends of the connecting pieces 21 are connected with the posterior side plate 13, and the lengths of the connecting pieces 21 are adjustable. Adopt the ankle joint shin bone side false body of above-mentioned structure, install the false body 10 in the shin bone distal end that the patient cut the bone, anterior lateral plate 12 and posterior lateral plate 13 correspond the anterior side and the rear side of patient's shin bone respectively, and bottom plate 11 corresponds the talus side of patient's shin bone, and the one end and the anterior lateral plate 12 of two connecting pieces 21 are connected, and the other end is connected with posterior lateral plate 13. Adopt two connecting pieces 21 to be connected prosthesis body 10 and shin bone distal end, can effectively strengthen the joint strength of prosthesis body 10 and shin bone distal end, through the length of adjusting connecting piece 21, make prosthesis body 10 and shin bone distal end realize interference fit, and then strengthen the fixed fastness of shin bone distal end that shin bone side prosthesis and patient cut the bone, make the difficult emergence dislocation of ankle joint shin bone side prosthesis. Moreover, the far end of the tibia and the two sides of the ankle joint tibia side prosthesis are more uniformly fastened through the two connecting pieces 21, and the torsional strength of the ankle joint tibia side prosthesis after being implanted into a human body can be effectively enhanced.

It should be noted that the height H of each of the front and

rear side plates

12 and 13 is between 15mm and 20mm, so that the front and

rear side plates

12 and 13 have a sufficient height to provide the first and second connection holes 121 and 131 in the front and

rear side plates

12 and 13, respectively, so that both ends of the connection member 21 are connected to the front and

rear side plates

12 and 13, respectively.

In the present embodiment, the height H of the front side plate 12 and the rear side plate 13 may be any value between 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, or 15mm to 20 mm.

As shown in fig. 1 and 3, the front side plate 12 has two first connection holes 121 spaced apart from each other, the rear side plate 13 has two second connection holes 131 spaced apart from each other, and both ends of the connection member 21 are connected to the first connection holes 121 and the second connection holes 131, respectively. By adopting the connection mode, the length of the connecting piece 21 can be conveniently adjusted.

Specifically, the ratio of the height of the center of the first connection hole 121 to the height of the front side plate 12 is between 0.5 and 0.8. Likewise, the ratio of the height of the center of the second coupling hole 131 to the height of the rear side plate 13 is between 0.5 and 0.8.

As shown in fig. 1 and 3, the connection member 21 includes a screw 211 and a compression nut 212, the compression nut 212 is disposed at the second connection hole 131, a first end of the screw 211 is connected with the first connection hole 121, and a second end of the screw 211 is provided with an external thread and is threadedly connected with the compression nut 212. By arranging the screw 211 and the compression nut 212 and using the compression nut 212, after the screw 211 passes through the first connecting hole 121, the screw 211 and the compression nut 212 can be conveniently connected in an aligned manner by fine adjustment of the compression nut 212, and the length of the connecting piece 21 can be adjusted by using a threaded connection manner.

In this embodiment, the front end and the middle of the screw 211 are polished rods, the front end and the middle can contact with the bone at the distal end of the tibia, and the rear end of the screw 211 is provided with external threads.

Specifically, ankle joint shin bone side false body still includes the inside lining, and the inside lining setting is provided with joint structure at the lower extreme of bottom plate 11 between bottom plate 11 and the inside lining, and bottom plate 11 and inside lining pass through joint structure and can dismantle the connection. Utilize the joint structure to be connected inside lining and bottom plate 11, have convenient to detach's advantage.

In this embodiment, the inner lining cooperates with the talus to form the joint.

As shown in fig. 3 and 5, the snap structure includes a dovetail groove 111 and a snap boss. Wherein, dovetail 111 sets up at 11 lower surfaces of bottom plate, and dovetail 111 is by extending backward forward, and the joint boss sets up the upper surface at the inside lining, joint boss and dovetail 111 joint cooperation. Through the matching mode of the dovetail groove 111 and the clamping boss, the connected lining and the prosthesis body 10 can be firmer.

It should be noted that the angle range of the clamping edge of the dovetail groove 111 is between 45 ° and 80 °, and the distance range a between the outer edge of the dovetail groove 111 and the outer edge of the bottom plate 11 is between 3mm and 15 mm.

In the present embodiment, the angle of the catching edge of the dovetail groove 111 may be 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, or any value between 45 ° and 80 °. The distance between the outer edge of the dovetail groove 111 and the outer edge of the bottom plate 11 may be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, or any value between 3mm and 15 mm.

As shown in fig. 3 and 5, the front end of the dovetail groove 111 is an open structure 30, the rear end of the dovetail groove 111 is a closed structure 32, a rib 31 is disposed at the open structure 30, two ends of the rib 31 are respectively connected with two sides of the open structure 30, and the height of the rib 31 is smaller than the depth of the dovetail groove 111. The lining is not easy to be separated after being installed on the bottom plate 11 by the stop rib 31. The height of the blocking rib 31 is smaller than the depth of the dovetail groove 111, so that the lining is not blocked by the blocking rib 31, and the lining is assembled conveniently.

In this embodiment, the height of the rib is 0.5mm, the depth of the dovetail groove is 1.5mm, and the difference is 1 mm.

As shown in fig. 5, the width dimension of the dovetail groove 111 gradually decreases in the front-to-rear direction. By adopting the structure, the clamping force received by the lining after the lining is assembled is larger and larger, and the assembling firmness of the lining is further improved.

As shown in fig. 3 and 5, a guide rib 33 is provided in the dovetail groove 111, a rear end of the guide rib 33 is connected to a rear end of the dovetail groove 111, a front end of the guide rib 33 extends forward, and a width dimension of the guide rib 33 is maintained. The guide ribs 33 can be used for guiding the lining, so that the lining is convenient to mount.

As shown in fig. 2, the rear end of the compression nut 212 is flush with the outer side wall of the posterior plate 13, or the rear end of the compression nut 212 is recessed in the outer side wall of the posterior plate 13, and by adopting the structure, after the compression nut 212 is connected with the screw 211, the outer wall of the posterior plate 13 is not protruded, so that the integrity of the ankle joint tibia side prosthesis is enhanced. The front end of the compression nut 212 protrudes from the inner side wall of the rear side plate 13. The compression nut 212 can be used for positioning the prosthesis body 10 through the convex part of the compression nut 212, and the ankle joint tibia side prosthesis can be conveniently installed.

It should be noted that the compression nut 212 has a first step surface, the second connection hole 131 has a second step surface disposed corresponding to the first step surface, and after the compression nut 212 is assembled to the second connection hole 131, the first step surface and the second step surface are spliced to limit the compression nut 212. A third step surface is arranged in the first connection hole 121, and the screw cap of the first end of the screw 211 is spliced with the third step surface when the first end of the screw 211 is connected with the first connection hole 121.

By adopting the structure, the compression nut 212 and the screw 211 are respectively embedded into the second connecting hole 131 and the first connecting hole 121 by utilizing the step surface, the screw caps of the compression nut 212 and the screw 211 cannot be exposed, the integrity of the ankle joint tibia side prosthesis is enhanced, and the compression nut 212 and the screw 211 are prevented from hurting a human body.

As shown in fig. 4, the front side plate 12 is an arc-shaped plate 122, and the rear side plate 13 is a flat plate 132. By adopting the structure, the outlines of the front side plate 12 and the rear side plate 13 are matched with the shape of the far end of the tibia, so that the experience of a patient can be enhanced.

Specifically, the width dimension of the bottom plate 11 gradually decreases in the front-to-rear direction. In the present embodiment, the included angle B formed by the two sidewalls of the bottom plate 11 is between 0 ° and 15 °.

The following is further described in connection with the clinical implantation of the tibial side prosthesis of the ankle joint:

1) two compression nuts 212 are assembled into two second connecting holes 131 which are arranged at intervals from back to front;

2) mounting the prosthesis body 10 fitted with two compression nuts 212 to the pre-osteotomized and drilled distal ankle tibia end;

3) two threaded rods 211 are assembled from front to back to the prosthesis body 10 and connected with two compression nuts 212. Specifically, two screws 211 respectively pass through the first connecting holes 121, then pass through bone holes pre-drilled at the distal end of the tibia, and are in threaded connection with the threads of the compression nut 212;

4) the two pairs of screws 211 and the compression nuts 212 are respectively screwed down, so that the two compression nuts 212 respectively compress the step surfaces of the two second connecting holes 131 and compress the rear side of the far end of the tibia, the ankle joint tibia side prosthesis and the far end of the tibia are in threaded connection to realize interference fit, and the prosthesis body 10 is prevented from dislocation.

The ankle joint tibia side prosthesis provided by the embodiment has the following beneficial effects:

(1) the prosthesis body 10 is connected with the tibia far end by the two connecting pieces 21, so that the connection strength of the prosthesis body 10 and the tibia far end can be effectively enhanced, the prosthesis body 10 and the tibia far end are in interference fit by adjusting the length of the connecting pieces 21, the fixation firmness of the tibia side prosthesis and the tibia far end of a patient osteotomy is further enhanced, and the ankle joint tibia side prosthesis is not easy to dislocate;

(2) the far end of the tibia and the two sides of the ankle joint tibia side prosthesis are fastened more uniformly through the two connecting pieces 21, and the torsional strength of the ankle joint tibia side prosthesis after being implanted into a human body can be effectively enhanced;

(3) the lining is not easy to fall off after being mounted on the bottom plate 11 by using the blocking ribs 31, and the height of the blocking ribs 31 is smaller than the depth of the dovetail grooves 111, so that the lining is not blocked by the blocking ribs 31, and the lining is convenient to assemble;

(4) the width size of the dovetail groove 111 is gradually reduced, so that the clamping force applied to the lining after the lining is assembled is increased, and the assembling firmness of the lining is further improved;

(5) the front end of the compression nut 212 protrudes out of the inner side wall of the rear side plate 13, and the compression nut 212 can form a positioning effect on the prosthesis body 10 through the protruding part of the compression nut 212, so that the ankle joint tibia side prosthesis can be conveniently installed;

(6) the dovetail groove 111 is internally provided with a guide rib 33, and the guide rib 33 can guide the lining, so that the lining is convenient to mount.

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 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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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

1. An ankle tibial side prosthesis, comprising:

the prosthesis comprises a prosthesis body (10) and a prosthesis body, wherein the prosthesis body comprises a bottom plate (11), a front side plate (12) and a rear side plate (13), the front side plate (12) is arranged on the front side of the bottom plate (11), and the rear side plate (13) is arranged on the rear side of the bottom plate (11);

coupling assembling (20), including two connecting pieces (21), two connecting piece (21) interval sets up the top of bottom plate (11), the one end of connecting piece (21) with preceding curb plate (12) are connected, the other end of connecting piece (21) with posterior lateral plate (13) are connected, just the length of connecting piece (21) is adjustable.

2. The ankle tibial side prosthesis of claim 1, wherein said anterior plate (12) has two first coupling holes (121) spaced apart, said posterior plate (13) has two second coupling holes (131) spaced apart, and both ends of said connecting member (21) are coupled to said first coupling holes (121) and said second coupling holes (131), respectively.

3. The ankle tibial side prosthesis according to claim 2, wherein said connecting member (21) comprises a screw (211) and a compression nut (212), said compression nut (212) being provided to said second connecting hole (131), a first end of said screw (211) being connected to said first connecting hole (121), a second end of said screw (211) being provided with an external thread and being in threaded connection with said compression nut (212).

4. The ankle tibial side prosthesis according to any one of claims 1 to 3, further comprising a liner, wherein the liner is disposed at a lower end of the base plate (11), a clamping structure is disposed between the base plate (11) and the liner, and the base plate (11) and the liner are detachably connected through the clamping structure.

5. The ankle tibial side prosthesis of claim 4, wherein said clamping structure comprises:

the dovetail groove (111) is arranged on the lower surface of the bottom plate (11), and the dovetail groove (111) extends from front to back;

the clamping boss is arranged on the upper surface of the lining and matched with the dovetail groove (111) in a clamping mode.

6. The ankle joint tibia lateral prosthesis according to claim 5, wherein the front end of the dovetail groove (111) is an open structure (30), the rear end of the dovetail groove (111) is a closed structure (32), a blocking rib (31) is arranged at the open structure (30), two ends of the blocking rib (31) are respectively connected with two sides of the open structure (30), and the height of the blocking rib (31) is smaller than the depth of the dovetail groove (111).

7. The ankle tibial side prosthesis of claim 5, wherein the width dimension of the dovetail slot (111) is gradually reduced in an anterior to posterior direction.

8. The ankle tibial side prosthesis according to claim 5, wherein a guide rib (33) is provided in the dovetail groove (111), a rear end of the guide rib (33) is connected to a rear end of the dovetail groove (111), a front end of the guide rib (33) extends forward, and a width dimension of the guide rib (33) is maintained.

9. The ankle tibial side prosthesis of claim 3,

the rear end of the compression nut (212) is flush with the outer side wall of the rear side plate (13), or the rear end of the compression nut (212) is recessed in the outer side wall of the rear side plate (13); and/or the presence of a gas in the gas,

the front end of the compression nut (212) protrudes out of the inner side wall of the rear side plate (13).

10. The ankle tibial side prosthesis of any of claims 1 to 3,

the front side plate (12) is an arc-shaped plate (122); and/or the presence of a gas in the gas,

the rear side plate (13) is a flat plate (132).