Modularized positive and negative shoulder joint replacement prosthesis

Abstract

The modular positive and negative shoulder and shoulder joint replacement prosthesis comprises a humerus handle prosthesis, a humerus handle near-end prosthesis is detachably arranged at the end of the humerus handle prosthesis, and a base is arranged at the end, away from the humerus handle prosthesis, of the humerus handle near-end prosthesis. A humerus head prosthesis and a middle piece are connected between the humerus handle near-end prosthesis and the base, concave-convex structures matched with each other are arranged on the humerus head prosthesis and the middle piece, and the humerus head prosthesis is arranged to be attached to the middle piece; the base is connected with the shoulder blade through a bone screw, and the humerus handle prosthesis is installed in the humerus in an inserted mode. According to the shoulder joint prosthesis, the load of a traditional shoulder joint prosthesis on a human body joint is relieved, various shoulder joint disease replacement surgery schemes are provided, the surgery operation process is simplified in the surgery, the operation of repeated model testing in the surgery is avoided, the shoulder joint structure of a patient can be adapted through modular design, and the practicability is high. And the application of half-shoulder replacement can be implemented on the basis of full-shoulder replacement.

Description

Technical Field

[0001] The present invention relates to the field of shoulder joint prostheses, and particularly to a modular reverse total shoulder arthroplasty prosthesis. Background Art

[0002] As the joint with the largest range of motion in the human body, the shoulder joint has a complex structure and important functions. When affected by diseases such as trauma, osteoarthritis, rheumatoid arthritis, and rotator cuff dysfunction, shoulder joint replacement surgery becomes an important treatment method. However, the existing traditional shoulder joint prostheses have exposed many limitations in clinical applications and urgently need technological innovation.

[0003] From the perspective of joint load, the design of traditional shoulder joint prostheses fails to fully consider the biomechanical characteristics of the human body. The materials, shapes, and structures of traditional prostheses are different from those of the native human shoulder joint. After the prosthesis is implanted, the joint force distribution is uneven, and it cannot match the coordinated movement of the surrounding muscles and ligaments. In the long term, it not only increases the load on the human joint, easily causing complications such as periprosthetic osteolysis and loosening, but also affects the comfort and stability of the patient's joint movement after surgery, reducing the service life of the prosthesis and the quality of life of the patient.

[0004] In terms of surgical applicability, traditional shoulder joint prostheses are difficult to meet the needs of various shoulder joint replacement surgeries. Shoulder joint lesions caused by different etiologies have differences in the degree of anatomical structure damage and joint function impairment. However, the standardized design of traditional prostheses lacks flexibility and cannot provide personalized solutions for complex cases. For example, for special situations such as severe bone defects and joint deformities, traditional prostheses are difficult to achieve precise adaptation, limiting the surgical effect and the patient's postoperative recovery.

[0005] Simplifying the surgical operation process is also a major challenge faced by traditional shoulder joint prostheses. Their structural design is complex. During the surgery, doctors need to spend a lot of time positioning, installing, and debugging the prosthesis, increasing the surgical difficulty and time cost. In addition, the complex operation process also increases the surgical risk, requires a high level of technical skills from doctors, and is not conducive to the wide promotion and popularization of shoulder joint replacement surgery.

[0006] The lack of modular design makes traditional shoulder joint prostheses unable to be flexibly adjusted according to the patient's shoulder joint structure. There are individual differences in the size, shape, and anatomical structure of each patient's shoulder joint, and the fixed specifications of traditional prostheses are difficult to achieve precise matching. This not only affects the stability and functionality of the prosthesis after implantation, but may also cause problems such as postoperative pain and limited movement.

[0007] In the application expansion of total shoulder replacement and hemi - shoulder replacement, traditional shoulder joint prostheses have obvious deficiencies. Total shoulder replacement and hemi - shoulder replacement are applicable to different disease stages and patient needs. However, traditional prostheses lack scalability and compatibility, making it difficult to conveniently convert from total shoulder replacement to hemi - shoulder replacement. This limits the flexibility of doctors to adjust treatment plans according to changes in patients' conditions and cannot provide patients with more appropriate and effective treatment options. Summary of the Invention

[0008] The purpose of the present invention is to provide a modular anterior - posterior shoulder joint replacement prosthesis, aiming to improve the problems of lack of scalability and compatibility of traditional shoulder joint prostheses.

[0009] The present invention is realized as follows: A modular anterior - posterior shoulder joint replacement prosthesis includes a humeral stem prosthesis. At the end of the humeral stem prosthesis, a proximal humeral stem prosthesis is detachably arranged. A base is arranged at the end of the proximal humeral stem prosthesis far from the humeral stem prosthesis. A humeral head prosthesis and an intermediate member are connected between the proximal humeral stem prosthesis and the base. The humeral head prosthesis and the intermediate member are provided with mutually adapted concave - convex structures, and the humeral head prosthesis is attached to the intermediate member. The base is connected to the scapula through bone screws, and the humeral stem prosthesis is inserted and installed in the humerus.

[0010] Preferably, the proximal humeral stem prosthesis is set as a curved hollow structure, and a screw rod is arranged at the bottom of the proximal humeral stem prosthesis. At the same time, a slot is arranged on the top surface of the proximal humeral stem prosthesis.

[0011] Preferably, the top size of the humeral stem prosthesis is larger than the bottom size, and a groove is arranged on the side wall of the humeral stem prosthesis. At the same time, a threaded groove is arranged on the top of the humeral stem prosthesis, and the screw rod is threadedly inserted into the threaded groove.

[0012] Preferably, the humeral head prosthesis is set as an anterior shoulder humeral head prosthesis, and the intermediate member is set as a glenoid prosthesis. The side walls of the anterior shoulder humeral head prosthesis and the glenoid prosthesis in contact are respectively set as a convex surface and a first concave curved surface.

[0013] Preferably, the side of the anterior shoulder humeral head prosthesis far from the glenoid prosthesis is set as a plane, and a plurality of first insertion rods are arranged on the plane. The first insertion rods are inserted into the slots. The included angle between the central axis of the convex surface of the anterior shoulder humeral head prosthesis and the vertical axis can be set to 130°, 140° or 150°.

[0014] Preferably, the base is set as a glenoid prosthesis base. A plurality of first counter - bores facing different directions are arranged on the side wall of the glenoid prosthesis base. A bone screw is penetrated through each first counter - bore. A sleeve groove is arranged on the side wall of the glenoid prosthesis far from the first concave curved surface, and the glenoid prosthesis base is located in the sleeve groove.

[0015] Preferably, the humeral head prosthesis is set as a reverse shoulder humeral head prosthesis, the middle piece is set as a reverse shoulder joint spacer, and the side walls where the reverse shoulder humeral head prosthesis and the reverse shoulder joint spacer are attached are respectively set as a convex surface and a second concave surface.

[0016] Preferably, multiple second insertion rods are fixedly arranged on the side wall of the reverse shoulder joint spacer away from the second concave surface, and the second insertion rods are inserted into the slots; the included angle between the central axis of the second concave surface and the vertical axis can be set to 130°, 140° or 150°.

[0017] Preferably, the base is set as a reverse shoulder humeral head base, and a plurality of second counterbores with different orientations are arranged on the reverse shoulder humeral head base, and bone screws are penetrated through at each second counterbore.

[0018] Preferably, an installation groove is arranged at the flat wall of the reverse shoulder humeral head prosthesis, and the reverse shoulder humeral head base is arranged at the installation groove.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The whole prosthesis module adopts a modular design, and according to the needs of different complications of patients, the orthotropic shoulder replacement prosthesis or the reverse shoulder replacement prosthesis of this design can be selected to complete the operation.

[0020] The design of this product aims to reduce the load of traditional shoulder joint prostheses on the human joints, provide solutions for various shoulder joint replacement surgeries, simplify the surgical operation process during the surgery, avoid the operation of repeatedly trying the mold during the surgery, and can adapt to the shoulder joint structure of patients through modular design, and can also implement the application of hemiarthroplasty on the basis of total shoulder replacement. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the humerus, scapula and orthotropic shoulder replacement prosthesis module of the present invention; Figure 2 is a first schematic structural diagram of the orthotropic shoulder replacement prosthesis module of the present invention; Figure 3 is a second schematic structural diagram of the orthotropic shoulder replacement prosthesis module of the present invention; Figure 4 is a schematic structural diagram of the proximal humeral prosthesis of the present invention; Figure 5 is a schematic structural diagram of the humeral stem prosthesis of the present invention; Figure 6 is a first schematic structural diagram of the humeral head prosthesis of the present invention; Figure 7 is a second schematic structural diagram of the humeral head prosthesis of the present invention; Figure 8 is a third schematic structural diagram of the humeral head prosthesis of the present invention; Figure 9It is a schematic structural view of the glenoid prosthesis of the present invention; Figure 10 It is a schematic structural view of the base of the glenoid prosthesis of the present invention; Figure 11 It is a schematic structural view of the humerus, scapula and reverse shoulder replacement prosthesis module of the present invention; Figure 12 It is a first schematic structural view of the reverse shoulder replacement prosthesis module of the present invention; Figure 13 It is a second schematic structural view of the reverse shoulder replacement prosthesis module of the present invention; Figure 14 It is a first schematic structural view of the reverse shoulder joint spacer of the present invention; Figure 15 It is a second schematic structural view of the reverse shoulder joint spacer of the present invention; Figure 16 It is a third schematic structural view of the reverse shoulder joint spacer of the present invention; Figure 17 It is a schematic structural view of the reverse shoulder humeral head prosthesis of the present invention; Figure 18 It is a schematic structural view of the base of the reverse shoulder humeral head of the present invention.

[0022] In the figure: 1. Humerus; 2. Scapula; 3. Prosthesis module; 31. Humeral stem prosthesis; 311. Groove; 312. Threaded groove; 32. Proximal humeral stem prosthesis; 321. Screw rod; 322. Slot; 33. Orthogonal shoulder humeral head prosthesis; 331. First insertion rod; 34. Glenoid prosthesis; 341. First concave surface; 342. Sleeve groove; 35. Base of glenoid prosthesis; 351. First counterbore; 36. Bone screw; 37. Base of reverse shoulder humeral head; 371. Second counterbore; 38. Reverse shoulder joint spacer; 381. Second concave surface; 382. Second insertion rod; 39. Reverse shoulder humeral head prosthesis; 391. Installation groove. Detailed implementation manners

[0023] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] The following will be further described in conjunction with the drawings and specific embodiments: Embodiment 1 As Figure 1As shown in the figure, this embodiment provides a modular reverse shoulder joint replacement prosthesis, which can be referred to as prosthesis module 3. This prosthesis module 3 is installed on the scapula 2 and the humerus 1 to perform the function of the shoulder joint.

[0025] As Figure 2 , Figure 3 shown in the figure, this prosthesis module 3 includes a humeral stem prosthesis 31, a proximal humeral stem prosthesis 32, a reverse shoulder humeral head prosthesis 33, a glenoid prosthesis 34, a glenoid prosthesis base 35, etc.

[0026] As Figure 5 shown in the figure, the humeral stem prosthesis 31 is set as a conical structure with a larger upper part and a smaller lower part, and a groove 311 is provided on the side wall, and its shape is similar to a reamer. The humeral stem prosthesis 31 is inserted and installed in the humerus 1, and knurled threads are provided on the outer side wall of the humeral stem prosthesis 31 to enhance the stability of the installation of the humeral stem prosthesis 31 and the humerus 1. The humeral stem prosthesis 31 is made by tantalum metal 3D printing. Except for the threaded groove 312 provided on the top plane, the rest of the outer contour surface is in a porous sponge shape.

[0027] As Figure 4 shown in the figure, the proximal humeral stem prosthesis 32 is a hollow structure as a whole, that is, a cylindrical support rib is integrally formed from top to bottom along the central axis of the proximal humeral stem prosthesis 3, and the outer shape is surrounded by four contour ribs. The bottom of the proximal humeral stem prosthesis 3 is a screw 321, and the screw 321 is threadedly inserted into the threaded groove 312 to realize the detachable connection between the proximal humeral stem prosthesis 3 and the humeral stem prosthesis 31.

[0028] The proximal humeral stem prosthesis 32 is made by tantalum metal 3D printing, which is a manufacturing process in which metal powder is melted layer by layer at high temperature and stacked. Tantalum has good biocompatibility and is widely used in the fields of orthopedics, dental implants, treatment of femoral head necrosis, coronary artery stent implantation, etc. Tantalum implants have good compatibility with human tissues and will not cause adverse reactions.

[0029] Except for the top plane, the slot 322 provided on the top plane and the bottom screw 321 of the proximal humeral stem prosthesis 32, the rest of the outer contour surface is in a porous sponge shape, which can increase the friction of the proximal humeral stem installation and improve the stability of the humeral stem installation. Its special porous surface structure makes its elastic modulus between human cancellous bone and cortical bone, and it is especially suitable for bone replacement, joint replacement and human tissue filling. This design reduces stress shielding while providing mechanical strength, which is beneficial to stress conduction and bone remodeling.

[0030] As Figure 5 , Figure 6As shown in the figure, the direct shoulder humeral head prosthesis 33 is set as a hemispherical structure. On the plane of the direct shoulder humeral head prosthesis 33, a plurality of first inserting rods 331 are provided. The number of the plurality of first inserting rods 331 corresponds to that of the slots 322, and the first inserting rods 331 are inserted into the slots 322. The glenoid prosthesis 34 is set as a cylinder, and a first concave curved surface 341 is provided on the side wall close to the direct shoulder humeral head prosthesis 33. The first concave curved surface 341 is adapted to the convex surface of the direct shoulder humeral head prosthesis 33, and both are polished smoothly. Therefore, the glenoid prosthesis 34 and the direct shoulder humeral head prosthesis 33 are attached and connected.

[0031] As Figure 9 、 Figure 10 shown, on the side wall of the glenoid prosthesis base 35, a plurality of first counterbores 351 facing different directions are provided. At each first counterbore 351, a bone screw 36 is penetrated and arranged. The glenoid prosthesis base 35 is arranged at the end of the scapula 2, and the bone screw 36 is threadedly inserted into the scapula 2. A sleeving groove 342 is provided on the side wall of the glenoid prosthesis 34 away from the first concave curved surface 341, and the glenoid prosthesis base 35 is located in the sleeving groove 342.

[0032] As Figure 6 、 Figure 7 、 Figure 8 shown, in addition, the included angle between the central axis of the convex surface of the direct shoulder humeral head prosthesis 33 and the vertical axis can be set to 130°, 140° or 150°. Furthermore, the neck-shaft angle of the direct shoulder shoulder joint replacement prosthesis has three angles to choose from: 150°, 140° and 130° respectively. The corresponding humeral head prosthesis can be selected to adjust the humeral neck-shaft angle.

[0033] The installation of the direct shoulder shoulder joint replacement prosthesis follows the following steps: 1. Fixation of the humeral end: During the operation, the diseased humeral head is removed. After confirming the installation position of the cross-section prosthesis, the humeral stem prosthesis is installed on the proximal humeral stem prosthesis, and then inserted into the humeral medullary cavity for fixation; 2. Fixation of the scapular end: During the operation, the glenoid of the scapula is removed. After confirming the installation position of the cross-section prosthesis, the glenoid prosthesis base is installed on the glenoid end of the scapula with bone screws; 3. Use the joint trial mold to check the joint alignment and movement. After determining the alignment position, the humeral head prosthesis can be installed on the proximal humeral stem prosthesis, and the glenoid prosthesis can be installed on the glenoid prosthesis base to complete the replacement surgery of the shoulder joint prosthesis.

[0034] Embodiment 2 As Figure 11 shown, this embodiment provides a modular reverse shoulder joint replacement prosthesis, which can be called prosthesis module 3. This prosthesis module 3 is installed on the scapula 2 and the humerus 1 to perform the function of the shoulder joint.

[0035] As Figure 12 、 Figure 13 shown, the prosthesis module 3 includes a humeral stem prosthesis 31, a proximal humeral stem prosthesis 32, a reverse shoulder humeral head prosthesis 39, a reverse shoulder joint spacer 38, a reverse shoulder humeral head base 37, etc.

[0036] As Figure 5 shown, the humeral stem prosthesis 31 is set as a tapered structure with a larger upper part and a smaller lower part, and a groove 311 is arranged on the side wall, whose shape is similar to a reamer. The humeral stem prosthesis 31 is inserted and installed in the humerus 1, and knurled threads are arranged on the outer side wall of the humeral stem prosthesis 31 to enhance the stability of the installation of the humeral stem prosthesis 31 and the humerus 1. The humeral stem prosthesis 31 is made by tantalum metal 3D printing. Except for the threaded groove 312 arranged on the top plane, the rest of the outer contour surface is in a porous sponge shape.

[0037] As Figure 4 shown, the proximal humeral stem prosthesis 32 is a hollow structure as a whole, that is, a cylindrical support rib is integrally formed from top to bottom on the central axis of the proximal humeral stem prosthesis 3, and its shape is surrounded by four contour ribs. The bottom of the proximal humeral stem prosthesis 3 is a screw rod 321, and the screw rod 321 is threadedly inserted into the threaded groove 312 to realize the detachable connection between the proximal humeral stem prosthesis 3 and the humeral stem prosthesis 31.

[0038] The proximal humeral stem prosthesis 32 is made by tantalum metal 3D printing, which is a manufacturing process in which metal powder is melted layer by layer at high temperature and stacked. Tantalum has good biocompatibility and is widely used in the fields of orthopedics, dental implants, treatment of femoral head necrosis, coronary artery stent implantation, etc. Tantalum implants have good compatibility with human tissues and will not cause adverse reactions.

[0039] Except for the top plane, the slot 322 arranged on the top plane and the bottom screw rod 321 of the proximal humeral stem prosthesis 32, the rest of the outer contour surface is in a porous sponge shape, which can increase the friction of the proximal humeral stem installation and improve the stability of the humeral stem installation. Its special porous surface structure makes its elastic modulus between human cancellous bone and cortical bone, and it is especially suitable for bone replacement, joint replacement and human tissue filling. This design reduces stress shielding while providing mechanical strength, which is beneficial to stress conduction and bone shaping.

[0040] As Figure 14 、 Figure 17 shown, the reverse shoulder humeral head prosthesis 39 is set as a hemispherical structure, the reverse shoulder joint spacer 38 is set as a cylinder, and a second concave surface 381 is arranged at the end of the reverse shoulder joint spacer 38, and the reverse shoulder humeral head prosthesis 39 and the reverse shoulder joint spacer 38 are arranged in a fitting connection.

[0041] As Figure 17 、 Figure 18As shown, a plurality of second counterbores 371 facing different directions are provided on the reverse shoulder humeral head base 37. A bone screw 36 is penetrated through each first counterbore 351. Therefore, under the action of the bone screw 36, the reverse shoulder humeral head base 37 is fixedly installed at the end of the scapula 2. An installation groove 391 is provided at the planar wall of the reverse shoulder humeral head prosthesis 39, and the reverse shoulder humeral head base 37 is provided at the installation groove 391.

[0042] As Figure 14 , Figure 15 , Figure 16 shown, in addition, the angle between the central axis of the second concave curved surface 381 and the vertical axis can be set to 130°, 140°, or 150°. Furthermore, the neck-shaft angle of the reverse shoulder joint replacement prosthesis has three angles to choose from: 150°, 140°, and 130° respectively. The humeral neck-shaft angle can be adjusted by selecting a corresponding humeral head prosthesis.

[0043] The installation of the reverse shoulder joint replacement prosthesis follows the following steps: 1. Fixation of the humeral end: During the operation, the diseased humeral head is removed. After confirming the installation position of the cross-section prosthesis, the humeral stem prosthesis is installed on the proximal humeral stem prosthesis, and then inserted into the humeral medullary cavity for fixation; 2. Fixation of the scapular end: During the operation, the glenoid cavity of the scapula is removed. After confirming the installation position of the cross-section prosthesis, the reverse shoulder humeral head base is installed on the scapular joint end with bone screws; 3. Use the joint trial mold to check the joint alignment and movement. After determining the alignment position, the reverse shoulder joint spacer can be installed on the proximal humeral stem prosthesis, and the reverse shoulder humeral head prosthesis can be installed on the reverse shoulder humeral head base to complete the replacement surgery of the shoulder joint prosthesis.

[0044] As can be seen from the above two embodiments, the overall prosthesis module 3 adopts a modular design. According to the needs of different complications of patients, the orthograde shoulder replacement prosthesis or the reverse shoulder replacement prosthesis of this design can be selected to complete the surgery. The design intention of this product is to reduce the load of the traditional shoulder joint prosthesis on the human joint, provide solutions for various shoulder joint replacement surgeries, simplify the surgical operation process during the surgery, avoid the operation of repeated trial molds during the surgery, and can adapt to the shoulder joint structure of patients through modular design. It can also be applied to semi-shoulder replacement on the basis of total shoulder replacement.

[0045] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular reverse shoulder joint replacement prosthesis, characterized in that, It includes a humeral stem prosthesis (31), and a proximal humeral stem prosthesis (32) is detachably arranged at the end of the humeral stem prosthesis (31). A base is arranged at the end of the proximal humeral stem prosthesis (32) away from the humeral stem prosthesis (31). A humeral head prosthesis and an intermediate member are connected between the proximal humeral stem prosthesis (32) and the base. The humeral head prosthesis and the intermediate member are provided with mutually adapted concave and convex structures, and the humeral head prosthesis is attached to the intermediate member. The base is connected to the scapula (2) by bone screws (36), and the humeral stem prosthesis (31) is inserted and installed in the humerus (1).

2. The modular reverse shoulder joint replacement prosthesis according to claim 1, characterized in that, The proximal humeral stem prosthesis (32) is arranged as a curved hollow structure, and a screw rod (321) is arranged at the bottom of the proximal humeral stem prosthesis (32). At the same time, a slot (322) is arranged on the top surface of the proximal humeral stem prosthesis (32).

3. The modular reverse shoulder joint replacement prosthesis according to claim 2, characterized in that, The top size of the humeral stem prosthesis (31) is larger than the bottom size, and a groove (311) is arranged on the side wall of the humeral stem prosthesis (31). At the same time, a threaded groove (312) is arranged on the top of the humeral stem prosthesis (31), and the screw rod (321) is threadedly inserted into the threaded groove (312).

4. The modular prosthetic replacement for anteroposterior shoulder joint according to claim 3, characterized in that, The humeral head prosthesis is arranged as a normal shoulder humeral head prosthesis (33), and the intermediate member is arranged as a glenoid prosthesis (34). The side walls of the normal shoulder humeral head prosthesis (33) and the glenoid prosthesis (34) that are in contact are respectively arranged as a convex surface and a first concave curved surface (341). The included angle between the central axis of the convex surface of the normal shoulder humeral head prosthesis (33) and the vertical axis can be set to 130°, 140° or 150°.

5. A modular reverse shoulder joint replacement prosthesis according to claim 4, wherein, One side of the normal shoulder humeral head prosthesis (33) away from the glenoid prosthesis (34) is arranged as a plane, and a plurality of first plug rods (331) are arranged on the plane. The first plug rods (331) are inserted into the slot (322).

6. The modular reverse shoulder joint replacement prosthesis according to claim 5, characterized in that, The base is arranged as a glenoid prosthesis base (35). A plurality of first counterbores (351) facing different directions are arranged on the side wall of the glenoid prosthesis base (35). A bone screw (36) is penetrated through each of the first counterbores (351). A sleeve groove (342) is arranged on the side wall of the glenoid prosthesis (34) away from the first concave curved surface (341). The glenoid prosthesis base (35) is located in the sleeve groove (342).

7. A modular reverse shoulder joint replacement prosthesis according to claim 3, characterized in that, The humeral head prosthesis is arranged as a reverse shoulder humeral head prosthesis (39), and the intermediate member is arranged as a reverse shoulder joint spacer (38). The side walls of the reverse shoulder humeral head prosthesis (39) and the reverse shoulder joint spacer (38) that are in contact are respectively arranged as a convex surface and a second concave curved surface (381). The included angle between the central axis of the second concave curved surface (381) and the vertical axis can be set to 130°, 140° or 150°.

8. A modular reverse shoulder joint replacement prosthesis according to claim 7, characterized in that, A plurality of second plug rods (382) are fixedly arranged on the side wall of the reverse shoulder joint spacer (38) away from the second concave curved surface (381). The second plug rods (382) are inserted into the slot (322).

9. A modular reverse shoulder joint replacement prosthesis according to claim 7, characterized in that, The base is set as a reverse shoulder humeral head base (37), and a plurality of second counterbores (371) with different orientations are provided on the reverse shoulder humeral head base (37), and bone screws (36) are penetrated through at each of the second counterbores (371).

10. The modular reverse shoulder joint replacement prosthesis according to claim 9, characterized in that, An installation groove (391) is provided at the planar wall of the reverse shoulder humeral head prosthesis (39), and the reverse shoulder humeral head base (37) is arranged at the installation groove (391).

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