CN211131556U

CN211131556U - Shoulder joint prosthesis

Info

Publication number: CN211131556U
Application number: CN201921259902.1U
Authority: CN
Inventors: 王彩梅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-07-31
Anticipated expiration: 2029-08-05

Abstract

The utility model provides a shoulder joint prosthesis, including humerus head prosthesis and shoulder glenoid prosthesis, humerus head prosthesis includes porous structure layer and polymer material layer, and porous structure layer has a plurality of holes, and the polymer material layer sets up on porous structure layer, and the one side of polymer material layer that deviates from porous structure layer is first articular surface, and first articular surface is the bellied cambered surface towards the outside of polymer material layer; the glenoid prosthesis has a second articular surface that is an arc surface that is concave toward the interior of the glenoid prosthesis, the first articular surface mating with the second articular surface. Because the polymer material layer has approximate hardness and elasticity with the natural physiological cartilage of the human body, the polymer material layer can meet the requirements on wear resistance and mechanical property, and has good biological property, the problems of easy abrasion or high brittleness and the like of the conventional shoulder joint prosthesis can be avoided, the performance of the conventional shoulder joint prosthesis is improved, and the use requirements of patients are met.

Description

Shoulder joint prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, particularly, relate to a shoulder joint prosthesis.

Background

The shoulder joint consists of a humerus head and a glenoid (namely, a glenoid) of the scapula, the sizes of the joint surfaces of the two connected bones are greatly different, and particularly, a glenoid fossa of the glenoid can only accommodate 1/4-1/3 of the joint head of the humerus head. The periphery of the glenoid fossa is provided with a glenoid lip to deepen the glenoid. The joint capsule is weak and loose, is attached between the periphery of the glenoid cavity and the anatomical neck of the humerus, and has a tendon of long head of biceps brachii wrapped by the synovium in the wall of the joint capsule, and the tendon has the function of reinforcing the shoulder joint.

The shoulder joint is the most flexible ball-and-socket joint of the whole body and can do flexion, extension, contraction, extension, rotation and rotation movements. The structural characteristics of large area difference between the joint head and the joint socket, thin and loose joint capsule and the like are added, so that the motor function with flexibility is reflected. There is a large amount of muscle around the shoulder joint. These muscles are important for maintaining the stability of the shoulder joint, but the shoulder joint has poor stability because there is less muscle in the anterior and inferior aspect of the joint and the joint capsule is most loose. When the upper limb falls backward in the abduction, supination, or on the palm or elbow, anterior dislocation of the shoulder joint is likely to occur.

The shoulder joint replacement is suitable for osteoarthritis. The osteoarthritis comprises primary and secondary arthritis, rheumatoid arthritis, traumatic arthritis, rotator cuff injury arthropathy, artificial shoulder joint revision, osteonecrosis, tumor, shoulder joint dysplasia, old infection and the like.

The artificial shoulder joint (i.e. shoulder joint prosthesis) replacement is made of metal, ceramic and other materials according to the form, structure and function of human shoulder joint, and is implanted into human body through surgical technique to replace the affected joint function, so as to achieve the purposes of relieving joint pain and recovering shoulder joint function.

With the progress of the technology, the materials used in the artificial shoulder joint have certain changes and developments, wherein metal ions are separated out from the metal materials, the metal ions accumulate in a certain concentration in a human body to cause chronic lesion, and meanwhile, the wear debris induces osteolysis in bone tissues around the prosthesis. The ceramic material has small abrasion, inertia and good biocompatibility, so that the artificial shoulder joint made of the ceramic material becomes the first choice for clinical use at present. However, due to the inherent brittleness of the ceramic material, if the thickness is thin, the ceramic material is easily broken and causes a problem that the operation is difficult.

Thus, the shoulder joint prostheses of the prior art still do not meet the requirements of use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shoulder joint prosthesis to improve the performance of the shoulder joint prosthesis in the prior art.

In order to achieve the above object, the present invention provides a shoulder joint prosthesis, comprising a humeral head prosthesis and a glenoid prosthesis, the humeral head prosthesis comprising a porous structural layer and a polymer material layer, the porous structural layer having a plurality of pores, the polymer material layer being disposed on the porous structural layer, one side of the polymer material layer facing away from the porous structural layer being a first articular surface, the first articular surface being an outwardly convex arc surface facing the polymer material layer; the glenoid prosthesis has a second articular surface that is an arc surface that is concave toward the interior of the glenoid prosthesis, the first articular surface mating with the second articular surface.

Further, the polymer material layer is arranged on the porous structure layer through an injection molding process, and a part of the material of the polymer material layer is infiltrated into a plurality of pores of the porous structure layer.

Further, the polymer material layer is made of polyurethane, polyvinyl alcohol gel or polylactic acid.

Further, the second articular surface is distributed with a texture structure which is sunken towards the inner part of the glenoid prosthesis and is used for containing joint fluid.

Further, the texture structure includes: a plurality of recessed lines arranged in a cross manner; or a plurality of concave lines arranged at intervals.

Further, the porous structure layer is provided with a first limiting structure, the polymer material layer is provided with a second limiting structure, and the first limiting structure is in limiting fit with the second limiting structure.

Further, the porous structure layer is provided with a first limiting groove, the first limiting groove forms a first limiting structure, and the polymer material layer comprises: the outer convex surface of the arc-shaped wall forms a first joint surface, and at least one part of the inner concave surface of the arc-shaped wall is connected with the porous structure layer; the first limiting protrusion is arranged on the inner concave surface of the arc-shaped wall, the first limiting protrusion forms a second limiting structure, and the first limiting protrusion is connected with the first limiting groove in a matched mode.

Further, the arc-shaped wall is of a bowl-shaped structure, and the first limiting protrusion is arranged at the bowl opening of the arc-shaped wall.

Further, the humeral head prosthesis further comprises: the solid structure layer is connected with one side of the porous structure layer, which is far away from the polymer material layer; a humeral stem connected to the solid structural layer, the humeral stem for penetrating into the humeral body.

Furthermore, the porous structure layer is provided with a third limiting structure, the solid structure layer is provided with a fourth limiting structure, and the third limiting structure is in limiting fit with the fourth limiting structure.

Furthermore, the porous structure layer is provided with a second limiting protrusion, the second limiting protrusion forms a third limiting structure, the solid structure layer is provided with a second limiting groove, the second limiting groove forms a fourth limiting structure, and the second limiting protrusion is connected with the second limiting groove in a matched mode.

Further, the solid structural layer is disposed within the porous structural layer, the porous structural layer having a first end surface for mating with the humeral body, the solid structural layer having a second end surface for mating with the humeral stem, the first end surface disposed about the second end surface.

Further, the solid structure layer is provided with a weight reduction cavity.

Furthermore, the solid structure layer is internally provided with a conical hole, the inner wall of the conical hole is used for being matched and connected with the end part of the humerus handle, the polymer material layer is of a rotary structure, and the conical hole is arranged by deviating from the axis of the polymer material layer.

Use the technical scheme of the utility model, set up porous structure layer and polymer material layer in the humerus head prosthesis, the first articular surface of polymer material layer and the second articular surface friction fit of glenoid prosthesis. The porous structure layer has a plurality of pores, can be stably connected with the polymer material layer, and can realize good biocompatibility with human tissues. Because the polymer material layer has approximate hardness and elasticity with the natural physiological cartilage of the human body, the polymer material layer can meet the requirements on wear resistance and mechanical property, and has good biological property, the problems of easy abrasion or high brittleness and the like of the conventional shoulder joint prosthesis can be avoided, the performance of the conventional shoulder joint prosthesis is improved, and the use requirements of patients are met.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 shows a schematic structural view of a shoulder joint prosthesis provided by an embodiment of the present invention;

fig. 2 shows a schematic view of the humeral head prosthesis in the shoulder joint prosthesis of fig. 1;

fig. 3 shows a schematic structural view of the glenoid prosthesis in the shoulder joint prosthesis in fig. 1;

FIG. 4 shows a first schematic view of the texture on the glenoid prosthesis of FIG. 3;

FIG. 5 shows a second schematic view of the texture on the glenoid prosthesis of FIG. 3;

FIG. 6 shows a third schematic view of the texture on the glenoid prosthesis of FIG. 3;

fig. 7 shows a fourth schematic of the texture on the glenoid prosthesis of fig. 3.

Wherein the figures include the following reference numerals:

10. a porous structural layer; 11. a second limit bulge; 12. a first end face; 20. a layer of polymeric material; 21. a first articular surface; 22. an arcuate wall; 23. a first limit protrusion; 30. a solid structural layer; 31. a second end face; 32. a weight-reducing cavity; 33. a tapered hole; 40. a humeral stem; 50. a glenoid prosthesis; 51. a second articular surface; 52. texture structure; 53. a body; 54. fixing the pile; 60. a humeral body.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 7, an embodiment of the present invention provides a shoulder joint prosthesis, including a humeral head prosthesis and a glenoid prosthesis 50, the humeral head prosthesis including a porous structural layer 10 and a polymer material layer 20, the porous structural layer 10 having a plurality of pores, the polymer material layer 20 being disposed on the porous structural layer 10, a side of the polymer material layer 20 facing away from the porous structural layer 10 being a first articular surface 21, the first articular surface 21 being an arc surface protruding toward the outside of the polymer material layer 20; the glenoid prosthesis 50 has a second articular surface 51, the second articular surface 51 being an arc surface that is concave toward the interior of the glenoid prosthesis 50, the first articular surface 21 mating with the second articular surface 51.

With the solution of the present embodiment, a porous structural layer 10 and a polymeric material layer 20 are provided in the humeral head prosthesis, and a first articular surface 21 of the polymeric material layer 20 is frictionally engaged with a second articular surface 51 of the glenoid prosthesis 50. Since the porous structure layer 10 has a plurality of pores, it can be stably connected with the polymer material layer 20 and can achieve good biocompatibility with human tissue. Because the polymer material layer 20 has similar hardness and elasticity with the natural physiological cartilage of the human body, the polymer material layer can meet the requirements on wear resistance and mechanical property, and has good biological property, the problems of easy wear or high brittleness and the like of the conventional shoulder joint prosthesis can be avoided, the performance of the conventional shoulder joint prosthesis is improved, and the use requirements of patients are met.

In the present embodiment, the polymer material layer 20 is disposed on the porous structure layer 10 by an injection molding process, and a portion of the material of the polymer material layer 20 permeates into a plurality of pores of the porous structure layer 10. In this way, the layer of polymeric material 20 and the porous structural layer 10 can be reliably bonded together, increasing the strength of the humeral head prosthesis. In this embodiment, the porous structure layer 10 is made of a metal material, and the porous structure layer 10 may be manufactured by 3D printing or chemical vapor infiltration. The size of the pores in the porous structure layer 10 is 0.3mm to 1.2mm, and the porosity is more than 50%. This may reduce weight and improve structural strength, and improve bio-fusion. The porous structure layer 10 is a porous structure, 3D communicated pores are distributed in the porous structure layer, and the skeleton can be communicated with the polymer material layer 20 through the porous structure.

In the present embodiment, the polymer material layer 20 is made of polyurethane, polyvinyl alcohol gel, or polylactic acid. The material has good stability, and the deformability and the strength of the material meet the long-term use requirements. Further, the polymer material layer 20 may employ a polyurethane TPU material. These materials have good ductility, breaking strength, wear resistance, biocompatibility, and therefore can be well combined with the porous structure layer 10 to ensure the overall performance of the long-term implantation of the prosthesis.

In this embodiment, the thickness of the polymer material layer 20 is 2mm to 6mm, and the thickness range can ensure the function of the articular surface and the quality of the polymer material layer 20.

In this embodiment, the glenoid prosthesis 50 may be made of a metallic material or a ceramic material. As shown in fig. 3, the glenoid prosthesis 50 includes a body 53 and a plurality of pegs 54 provided on the body, the second articular surface 51 is located on the body 53, the side surface of the body 53 is polished to prevent adhesion of soft tissues, and the side of the body 53 away from the second articular surface 51 and the surface of the pegs 54 are bio-coated to achieve the middle-term and long-term bio-fixation of the prosthesis. The fixing piles 54 may be provided in an amount of 1 to 3.

In this embodiment, the second articular surface 51 has a texture 52 distributed thereon that is recessed toward the interior of the glenoid prosthesis 50, the texture 52 serving to contain synovial fluid. By providing the texturing 52, the incoming joint fluid can be retained, so that the first joint surface 21 and the second joint surface 51 can be lubricated by the joint fluid, thereby reducing wear, increasing the service life of the shoulder joint prosthesis, and facilitating movement of the person. In this embodiment, texture 52 requires a smoothing process to prevent soft tissue bruising caused by surface roughness.

Specifically, as shown in fig. 4 to 7, the texture structure 52 includes a plurality of intersecting recessed lines, or a plurality of spaced recessed lines, which may retain synovial fluid by means of groove lines of different shapes, the intersecting recessed lines may be a mesh structure, such as a honeycomb structure as shown in fig. 4 or a straight intersecting line structure as shown in fig. 5, the spaced groove lines may be a ring structure or an L structure, such as shown in fig. 6 and 7, and the depth of the texture structure 52 is 0.15mm to 0.25 mm.

Further, in the case that the texture structure 52 includes a plurality of recessed lines arranged in a crossed manner, counter bores with a depth greater than the recessed depth of the recessed lines are distributed at the crossing points of the texture structure, and joint fluid can be further contained through the counter bores, so that abrasion is reduced.

In the present embodiment, the porous structure layer 10 has a first position-limiting structure, and the polymer material layer 20 has a second position-limiting structure, and the first position-limiting structure and the second position-limiting structure are in position-limiting fit. This may improve the strength of the connection of the porous structure layer 10 to the polymer material layer 20.

As shown in fig. 2, the porous structure layer 10 has a first limiting groove forming a first limiting structure, and the polymer material layer 20 includes: an arc-shaped wall 22, wherein the outer convex surface of the arc-shaped wall 22 forms a first joint surface 21, and at least one part of the inner concave surface of the arc-shaped wall 22 is connected with the porous structure layer 10; first spacing arch 23 sets up on the concave surface of arc wall 22, and first spacing arch 23 forms second limit structure, and first spacing arch 23 is connected with the cooperation of first spacing recess. The first limiting protrusion 23 is matched with the first limiting groove, so that the connection strength between the polymer material layer 20 and the porous structure layer 10 can be further improved, and the polymer material layer 20 is prevented from being separated. Specifically, the first stopper protrusion 23 may be provided with a tapered structure in cross section, and the angle of the tapered structure is less than 60 °.

Further, the arc-shaped wall 22 is a bowl-shaped structure, and the first limiting protrusion 23 is disposed at the bowl opening of the arc-shaped wall 22. With the above arrangement, the edges of the polymer material layer 20 can be fixed to prevent the polymer material layer 20 from flanging or separating from the porous structure layer 10 under a stress environment. The first limiting groove is of an annular groove structure, and the first limiting bulge 23 is of an annular bulge structure. This strengthens the connection of the polymer material layer 20 to the porous structure layer 10 in the circumferential direction of the porous structure layer 10 and in the circumferential direction of the polymer material layer 20.

In this embodiment, the humeral head prosthesis further comprises: a solid structural layer 30 connected to the side of the porous structural layer 10 facing away from the polymeric material layer 20; a humeral stem 40 is connected to the solid structural layer 30, the humeral stem 40 being configured to penetrate into the humeral body 60. The solid structure layer 30 has no pores inside the material, and the solid structure layer 30 is used for supporting. The solid structure layer 30 is made of a metal material, and a part of the material of the solid structure layer 30 penetrates into a plurality of pores of the porous structure layer 10. This may improve the strength of the connection between the solid structure layer 30 and the porous structure layer 10.

In this embodiment, the porous structure layer 10 has a third position-limiting structure, and the solid structure layer 30 has a fourth position-limiting structure, and the third position-limiting structure is matched with the fourth position-limiting structure in a position-limiting manner. Through the above arrangement, the connection strength of the solid structure layer 30 and the porous structure layer 10 can be further improved.

Specifically, the porous structure layer 10 has a second limiting protrusion 11, the second limiting protrusion 11 forms a third limiting structure, the solid structure layer 30 has a second limiting groove, the second limiting groove forms a fourth limiting structure, and the second limiting protrusion 11 is connected with the second limiting groove in a matching manner. Therefore, reliable connection can be realized through the matching of the second limiting protrusion 11 and the second limiting groove, and the solid structure layer 30 is prevented from being separated from the porous structure layer 10. In this embodiment, the first stopper groove is located on the second stopper protrusion 11.

In this embodiment, the solid structural layer 30 is disposed within the porous structural layer 10, the porous structural layer 10 having a first end surface 12, the first end surface 12 for mating with the humeral body 60, the solid structural layer 30 having a second end surface 31, the second end surface 31 for mating with the humeral stem 40, the first end surface 12 disposed about the second end surface 31. In this way, the porous structural layer 10 and the solid structural layer 30 can be connected with the humeral body 60, and the reliability of the connection between the shoulder joint prosthesis and the humeral body 60 is improved. Specifically, the first end face 12 is flush with the second end face 31, and the porous structure layer 10 has a limiting step thereon, and the limiting step is in limiting fit with the side wall of the solid structure layer 30.

As shown in FIG. 2, the solid structural layer 30 has weight-reducing cavities 32 therein. By providing the weight-reducing cavity 32, the weight of the solid structural layer 30 and the shoulder joint prosthesis as a whole can be reduced. In this embodiment, the solid structural layer 30, the porous structural layer 10 and the polymeric material layer 20 are all wall-like structures.

In the embodiment, the solid structure layer 30 has a tapered hole 33 therein, the inner wall of the tapered hole 33 is used for matching connection with the end of the humeral stem 40, the polymer material layer 20 is a solid of revolution structure, and the tapered hole 33 is disposed offset from the axis of the polymer material layer 20. With the above arrangement, the connection between the humeral stem 40 and the solid structural layer 30 can be facilitated, and the connection strength between the two can be improved. The force requirement can be met by placing the tapered holes 33 offset from the axis of the layer of polymeric material 20. The tapered bore 33 in this embodiment communicates with the weight-reducing chamber 32. In this embodiment, the outer profile of the second end surface 31 of the solid structure layer 30 is circular, and the tapered holes 33 are concentrically disposed with the second end surface 31 of the solid structure layer 30. Thus, the tapered hole 33 has the same size on both sides in a cross section passing through the center of the second end surface 31.

Further, in the present embodiment, the porous structure layer 10 is a metal structure formed integrally. The metal structure is divided into an inner layer and an outer layer, wherein the outer layer is a porous structure layer 10, and the inner layer is a solid structure layer 30. In this way, the porous structure layer 10 can reduce the weight and provide the elastic modulus suitable for the prosthesis and the bone, and particularly, the polymer material layer 20 is combined with the porous structure layer 10 through a plurality of pores, so that the combination strength is stronger and the combination is firmer. The solid structural layer 30 can ensure the overall strength of the system, the hollow weight-reducing cavity 32 can reduce the weight, and the tapered hole 33 is used for being assembled with the humeral stem 40, so that a stable interface can be provided, and more choices are provided for clinic.

The technical scheme has the following advantages: the layer of polymer material 20 takes advantage of the good biological properties of the polymer and the excellent wear resistance under joint synovial fluid. The layer of polymer material 20 is connected to the porous structure layer 10 by injection moulding. The porous structure layer 10 has a plurality of pores, and can have good holding force on the polymer. The solid structure layer 30 in the porous structure layer 10 is a dense solid layer, ensuring strength. The porous structure layer 10 is provided with an outer upper side reverse hook region and an inner lower side reverse hook region, which are intended to fix the edges of the polymer and prevent flanging and separation in a stress environment. The solid structural layer 30 is hollow inside and can reduce weight, which is particularly important for the light weight of the shoulder joint, and the offset taper hole 33 can realize the taper connection with the humeral stem 40. The 3D porous structure is used in the area in contact with the bone surface of the humeral body 60, which is beneficial for osseointegration of the prosthesis with the bone. The glenoid prosthesis 50 is made of a metallic material or a ceramic material, and the texture 52 on the surface of the glenoid prosthesis 50 can sufficiently contain joint fluid, and the present solution provides several different textures 52. The side of the glenoid prosthesis 50 is highly polished to prevent soft tissue adhesion. The dorsal side of the glenoid prosthesis 50 and the fixation pegs 54 are biocoated to anticipate the biological fixation of the prosthesis.

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. A shoulder joint prosthesis comprising a humeral head prosthesis and a glenoid prosthesis (50), characterized in that,

the humeral head prosthesis comprises a porous structural layer (10) and a polymeric material layer (20), the porous structural layer (10) having a plurality of pores, the polymeric material layer (20) being disposed on the porous structural layer (10), a side of the polymeric material layer (20) facing away from the porous structural layer (10) being a first articular surface (21), the first articular surface (21) being an arc surface that is convex toward an exterior of the polymeric material layer (20);

the glenoid prosthesis (50) has a second articular surface (51), the second articular surface (51) being an arc surface that is concave towards the interior of the glenoid prosthesis (50), the first articular surface (21) cooperating with the second articular surface (51).

2. Shoulder joint prosthesis according to claim 1, characterized in that the layer of polymer material (20) is provided on the porous structural layer (10) by means of an injection moulding process, a portion of the material of the layer of polymer material (20) penetrating into a plurality of pores of the porous structural layer (10).

3. Shoulder joint prosthesis according to claim 1, characterized in that the layer of polymer material (20) is made of polyurethane, polyvinyl alcohol gel or polylactic acid.

4. Shoulder joint prosthesis according to claim 1, characterized in that the second articular surface (51) is distributed with a texturing (52) recessed towards the inside of the glenoid prosthesis (50), the texturing (52) being intended to contain joint fluid.

5. Shoulder joint prosthesis according to claim 4, characterized in that the texturing (52) comprises:

a plurality of recessed lines arranged in a cross manner; or the like, or, alternatively,

a plurality of recessed lines arranged at intervals.

6. The shoulder joint prosthesis of claim 1 wherein the porous structural layer (10) has a first stop structure and the polymeric material layer (20) has a second stop structure, the first and second stop structures being in stop engagement.

7. Shoulder joint prosthesis according to claim 6, characterized in that the porous structural layer (10) has a first retaining groove forming the first retaining structure, the polymeric material layer (20) comprising:

an arcuate wall (22), the outer convex surface of said arcuate wall (22) forming said first articular surface (21), at least a portion of the inner concave surface of said arcuate wall (22) being connected to said porous structural layer (10);

the first limiting protrusion (23) is arranged on the inner concave surface of the arc-shaped wall (22), the first limiting protrusion (23) forms the second limiting structure, and the first limiting protrusion (23) is connected with the first limiting groove in a matched mode.

8. Shoulder joint prosthesis according to claim 7, characterized in that the curved wall (22) is a bowl-shaped structure, the first stop protrusion (23) being provided at the bowl mouth of the curved wall (22).

9. The shoulder joint prosthesis of any one of claims 1-8, wherein the humeral head prosthesis further comprises:

a solid structural layer (30) connected to a side of the porous structural layer (10) facing away from the polymeric material layer (20);

a humeral stem (40) connected to the solid structural layer (30), the humeral stem (40) for penetrating into a humeral body.

10. The shoulder prosthesis of claim 9 wherein the porous structural layer (10) has a third stop structure and the solid structural layer (30) has a fourth stop structure, the third stop structure being in stop engagement with the fourth stop structure.

11. The shoulder joint prosthesis of claim 10, wherein the porous structural layer (10) has a second stopper protrusion (11), the second stopper protrusion (11) forms the third stopper structure, the solid structural layer (30) has a second stopper groove, the second stopper groove forms the fourth stopper structure, and the second stopper protrusion (11) is fittingly connected with the second stopper groove.

12. The shoulder prosthesis of claim 9, wherein the solid structural layer (30) is disposed within the porous structural layer (10), the porous structural layer (10) having a first end surface (12), the first end surface (12) being for mating with the humeral body, the solid structural layer (30) having a second end surface (31), the second end surface (31) being for mating with the humeral stem (40), the first end surface (12) being disposed about the second end surface (31).

13. Shoulder joint prosthesis according to claim 9, characterized in that the solid structural layer (30) has weight-loss cavities (32) therein.

14. Shoulder prosthesis according to claim 9, characterized in that the solid structural layer (30) has a conical hole (33) therein, the inner wall of the conical hole (33) being intended for a mating connection with the end of the humeral stem (40), the polymeric material layer (20) being of revolution, the conical hole (33) being arranged offset from the axis of the polymeric material layer (20).