Assembled artificial radial head revision prosthesis

Abstract

The invention relates to the technical field of artificial joint replacement, and discloses an assembled artificial radial head revision prosthesis which comprises a radial head, a radial neck and a radial handle, the radial head is provided with a joint face, the radial head and the radial neck are in taper connection, the radial neck and the radial handle are in taper connection, and the joint face is provided with a joint face. The radius head and the radius neck are turned outwards by 10 degrees to 15 degrees, and ligament suture holes are formed in the two sides of the coronal position of the radius neck. Double fixation of soft tissue and hard tissue can be achieved, so that the prosthesis has a firmer fixing effect.

Description

Technical Field

[0001] The present application relates to the technical field of artificial joint replacement, and in particular to a modular artificial radial head revision prosthesis. Background Art

[0002] At present, with the increasing maturity of medical level and surgical technology of artificial joint replacement, the number of artificial radial head replacement operations is also increasing. In clinical practice, artificial radial head replacement has achieved good therapeutic effects for severe comminuted radial head fractures caused by trauma, elbow instability, elbow valgus deformity, humeroradial arthritis and other diseases.

[0003] However, as the initial replacement prosthesis serves longer in the body, various clinical problems such as prosthesis failure or complications may occur, such as periprosthetic fractures, abnormal prosthesis force lines, radial shaft perforation by the stem, prosthesis loosening, metal nano-ion toxicity, loose prosthesis causing limited forearm rotation function, and combined elbow instability. At this time, the only treatment effect can be achieved through revision surgery.

[0004] Most of the existing prostheses are straight and integrated, and there are also radial prosthesis components, which include a radial head and a radial stem, the radial head includes a connection hole, and the radial stem includes a connector, and the connector and the connection hole are adapted to connect the radial head and the radial stem together. When the prosthesis is installed, the radial head and the ulna cooperate, and the radial stem is fixed by bone cement. The fixation reliability of the prosthesis in the human body needs to be improved. Summary of the invention

[0005] In order to further improve the fixation effect of the prosthesis, the present application provides a modular artificial radial head revision prosthesis.

[0006] The present application provides a modular artificial radial head revision prosthesis, which adopts the following technical solution: A modular artificial radial head revision prosthesis comprises three sections: a radial head, a radial neck and a radial stem. The radial head is provided with an articular surface. The radial head and the radial neck are taper-connected. The radial neck and the radial stem are taper-connected. The radial head and neck form 10° to 15° eversion. Ligament suture holes are provided on both sides of the coronal position of the radial neck.

[0007] By adopting the above technical scheme, the radial head, radial neck and radial stem are connected by a taper, which can be combined and installed flexibly during surgery, and various renovation problems can be easily dealt with. When all the components of the prosthesis are assembled and installed in the human body, the radial head articular surface of the prosthesis cooperates with the ulna joint, and the radial stem of the prosthesis is fixedly connected to the human body's own radius. Under normal circumstances, the human elbow joint will have a moving valgus angle, which helps to disperse the pressure when the upper arm is raised at noon. Generally speaking, the valgus angle is normal between 10° and 15°. After the prosthesis and tissue are fixed and installed, the soft tissue is reconstructed by suture fixation, and the radial tuberosity biceps tendon is reconstructed and sutured in the ligament suture holes on both sides of the coronal position of the radial neck, so as to achieve dual fixation of soft tissue and hard tissue, so that the prosthesis has a more reliable fixation effect.

[0008] Optionally, a first cone is fixedly mounted on the radial neck, a first conical inner hole is formed in the radial head, the first cone and the first conical inner hole are coaxially connected, the radial neck and the radial stem are connected via a second cone, the second cone is fixedly mounted on the radial stem, a second conical inner hole is formed in the radial neck, the second cone and the second conical inner hole are coaxially fixedly connected, and an angle of 10° to 15° is formed between a central axis of the first cone and a central axis of the second conical inner hole.

[0009] By adopting the above technical solution, the radial head and neck form 10° to 15° eversion, which is in line with the principles of biomechanics. Therefore, the radial neck of the prosthesis is directly fixed between the radial head and the radial stem, becoming an important part of the radius. The radial neck has important functions such as transmitting force, flexing and rotating the limbs. It is also one of the most vulnerable parts and is prone to fractures. When the installed prosthesis needs to be revised, it can be replaced according to the actual specific situation.

[0010] Optionally, a first radial force line marking line is provided on the outer surface of the radial head, and the first radial force line marking line and the central axis of the first cone inner tapered hole are parallel to each other; a second radial force line marking line and a third radial force line marking line are provided on the outer surface of the radial neck, and the second radial force line marking line and the central axis of the first cone inner tapered hole are parallel to each other.

[0011] By adopting the above technical solution, when the radial head and radial neck are installed, the first radial force line marking line and the second radial force line marking line are on a straight line, so that the radial head and radial neck are assembled and aligned, and the radial head and neck form a certain angle of the stem-neck angle intuitively.

[0012] Optionally, a fourth radial force line marking line is provided on the outer surface of the radial stem, and the fourth radial force line marking line and the central axis of the second cone are parallel to each other.

[0013] By adopting the above technical solution, it can be determined whether the radial neck and the radial stem are aligned and assembled according to whether the third radial force line marking line and the fourth radial force line marking line are on a straight line.

[0014] Optionally, the proximal surface of the radial stem is sprayed with Ti, Ta or HA.

[0015] By adopting the above technical solution and through biological fixation, the bone-binding interface and the bionic design of the morphology can achieve good mid- and long-term fixation and bone ingrowth effects.

[0016] Optionally, the distal crown of the radial stem is fixed with sagittal locking screws.

[0017] By adopting the above technical solution, the coronal plane and the sagittal plane are different planes, and interlocking screws are installed on different planes to make the prosthesis have a more secure fixation effect.

[0018] Optionally, the radial handle surface is provided with a distal arc groove By adopting the above technical solution, the distal arc groove can increase the anti-rotation ability of the radial stem body, and increase the contact area and friction between the radial stem body and the surrounding bone tissue.

[0019] Optionally, the radial stem has a transverse bone cement groove and a longitudinal anti-rotation groove.

[0020] By adopting the above technical scheme, in fracture and joint replacement surgery, it is crucial to prevent the rotation of implants or fracture fragments to ensure the stability of fractures and joints. If the radial stem is fixed with bone cement, a radial stem with a bone cement groove is used. The bone cement groove is used to accommodate and fix the bone cement. The transverse bone cement groove may help to evenly distribute and fix the bone cement in the radial stem body. The setting of the longitudinal anti-rotation flat groove can increase the anti-rotation ability of the radial stem body and increase the contact area and friction between the radial stem body and the surrounding bone tissue.

[0021] Optionally, the radial neck surface is provided with a smooth surface or a sandblasted surface.

[0022] By adopting the above technical solutions, more options are provided for clinicians to make the prosthesis more suitable for patients.

[0023] In summary, the present application includes at least one of the following beneficial effects: 1. The prosthesis adopts a modular structure, which consists of three parts: radial head, radial neck and radial stem. Each part is connected by a taper, which can be freely combined and flexibly installed during surgery, easily coping with various revision problems; 2. Provide different fixation methods, including bone cement fixation and biological fixation. Doctors can reasonably choose bone cement fixation or biological fixation according to the patient's condition and bone quality; 3. Provide a variety of optional bone-integration interface designs: spraying the proximal radius surface (Ti or Ta or HA), achieving good mid- and long-term fixation and bone ingrowth effects through the bone-integration interface and morphological bionic design; 4. The distal crown of the radial stem and the interlocking screw fixation of the scapula make the prosthesis more secure and evenly fixed; 5. Suture fixation of reconstructed soft tissue: The radial tuberosity biceps tendon reconstruction is sutured into the suture holes on both sides of the coronal position of the radial neck to achieve dual fixation of soft tissue and hard tissue, making the prosthesis have a more secure fixation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the relationship between the radial head, radial neck and radial stem of an embodiment of the present application; Figure 2 This is a schematic diagram of the specific structure of the radial neck embodied in an embodiment of the present application; Figure 3 This is a schematic diagram of the radial force line marking line design of the prosthesis in an embodiment of the present application; Figure 4 It is a schematic diagram of an embodiment of the present application showing that the radial handle has a surface spray coating or a cancellous bone-like porous structure layer; Figure 5 is a schematic diagram of the embodiment of the present application showing the cooperation between the radial stem and the locking screw; Figure 6 It is a front view of an embodiment of the present application showing that a radial handle is provided with a bone cement groove; Figure 7 This is an overall structural diagram of an embodiment of the present application showing that a radial handle is provided with a bone cement groove.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. radial head; 11. articular surface; 12. tapered hole in the first cone; 13. first radial force line marking line; 2. radial neck; 21. first cone; 22. ligament suture hole; 23. second radial force line marking line; 24. third radial force line marking line; 25. tapered hole in the second cone; 3. radial handle; 31. second cone; 32. fourth radial force line marking line; 331. surface spray coating; 332. cancellous bone-like porous structure layer; 34. distal arc groove; 35. coronal plane interlocking nail hole; 36. sagittal plane interlocking nail hole; 37. bone cement groove; 38. anti-rotation flat groove; 39. bullet head; 4. interlocking screw. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-7 This application is described in further detail.

[0027] The present application embodiment discloses a modular artificial radial head revision prosthesis. Figure 1A modular artificial radial head revision prosthesis includes a radial head 1, a radial neck 2 and a radial stem 3. The radial head 1 and the radial stem 3 are connected by a taper, and the radial neck 2 and the radial stem 3 are also connected by a taper. The taper connection means that the end of the handle (or similar component) and the end of the insertion hole are respectively designed to be tapered, and the taper angles of the two must be consistent so as to achieve a safe and stable connection through the contact pressure of the tapered surface.

[0028] Reference Figure 1 The radial head 1 is provided with an articular surface 11 for contacting the ulna and a first conical inner hole 12. The radial neck 2 is integrally formed with a first cone 21. When the first cone 21 is inserted into the first conical inner hole 12, the first cone 21 and the first conical inner hole 12 are coaxially connected. The radial neck 2 is provided with a second conical inner hole 25. One end of the radial stem 3 is integrally formed with a second cone 31. The second cone 31 and the second cone inner hole 25 are coaxially connected. It can be freely combined and flexibly installed during surgery, easily coping with various renovation problems.

[0029] Ligament suture holes 22 are arranged on both sides of the coronal position of the radial neck 2, and there are two ligament suture holes 22 on each side. After the prosthesis is installed, the suture fixation of the reconstructed soft tissue is performed, and the radial tuberosity biceps tendon is reconstructed and sutured into the ligament suture holes 22 on both sides of the coronal position of the radial neck 2, so as to achieve dual fixation of soft tissue and hard tissue, so that the prosthesis has a more reliable fixation effect.

[0030] Reference Figure 2 , there is an angle θ of 10° to 15° between the central axis of the first cone 21 of the radial neck 2 and the central axis of the second cone inner tapered hole 25. When the prosthesis is assembled, a valgus (dry neck angle) of 10° to 15° is formed between the radial head 1 and the neck. In the embodiment of the present application, preferably, a valgus (dry neck angle) of 15° is formed between the radial head 1 and the neck. The radial head 1, radial neck 2 and radial stem 3 of the radial head 1 prosthesis are all designed bionics, conform to the principles of biomechanics, and have bionic functions and morphologies.

[0031] Reference Figure 3 The outer surface of the radial head 1 is provided with a first radial force line marking line 13, and the first radial force line marking line 13 and the central axis of the first cone inner tapered hole 12 are parallel to each other. The outer surface of the radial neck 2 is provided with a second radial force line marking line 23 and a third radial force line marking line 24, and the second radial force line marking line 23 is parallel to the central axis of the first cone 21, and the third radial force line marking line 24 is parallel to the central axis of the second cone inner tapered hole 25, so the first radial force line marking line 13 and the third radial force line marking line 24 can intuitively reflect the formation of a dry neck angle between the radial head 1 and the neck. When installing the radial head 1 and the radial neck 2, when the first radial force line marking line 13 and the second radial force line marking line 23 are on the same straight line, the radial head 1 and the radial neck 2 are installed in alignment.

[0032] The outer surface of the radial stem 3 is provided with a fourth radial force line marking line 32, and the fourth radial force line marking line 32 is parallel to the central axis of the second cone 31. When the radial neck 2 and the radial stem 3 are assembled, when the third radial force line marking line 24 and the fourth radial force line marking line 32 are in a straight line, the radial neck 2 and the radial stem 3 are assembled and installed in alignment.

[0033] Artificial radial head 1 revision prosthesis provides multiple options of biological fixation and bone cement fixation to meet the clinical needs of different patient populations.

[0034] Reference Figure 4 If biological fixation is selected, the proximal surface of the radial stem 3 can be sprayed with (Ti or Ta or HA) to form a surface spray layer 331, or a porous structure layer 332 of cancellous bone can be printed by 3D printing with a titanium alloy or tantalum with good biocompatibility, so as to achieve good mid- and long-term fixation and bone ingrowth effects through the bionic design of the bone-binding interface and morphology. The outer surface of the radial stem 3 is also provided with a distal arc groove 34, which can play an anti-rotation role for the radial stem 3.

[0035] Reference Figure 5 The coronal plane of the radial neck 2 is provided with a coronal plane interlocking nail hole 35, and the sagittal plane of the radial neck 2 is provided with a sagittal plane interlocking nail hole 36. The coronal plane and the sagittal plane of the radial neck 2 are fixed with interlocking screws 4, so that the prosthesis has a more reliable fixing effect.

[0036] Reference Figure 6 If bone cement fixation is selected, a transverse bone cement groove 37 and a longitudinal anti-rotation flat groove 38 can be set on the radial stem 3, and the surface of the radial stem 3 can also be provided with a variety of methods such as smooth surface or sandblasted surface for clinical selection.

[0037] Specifically, refer to Figure 6 and Figure 7 The transverse bone cement grooves 37 are arranged at intervals along the length direction of the radial handle 3, which helps to evenly distribute and fix the bone cement in the radial handle 3. Three anti-rotation flat grooves 38 are evenly arranged along the circumference of the radial handle 3 to increase the contact area and friction between the radial handle 3 and the surrounding bone tissue. The design of the bullet head 39 at the distal end of the radial handle is conducive to the connection with the human radius.

[0038] In addition, the biological revision radial stem 3 is designed with stem shape and size specifications based on Chinese anatomical data, providing a series of diameters and lengths for clinical selection. The bionic radial head 1 can provide multiple specifications such as φ16-22mm, and the bionic radial neck 2 can provide different neck lengths such as 10-14mm.

[0039] The working principle of a modular artificial radial head revision prosthesis in the embodiment of the present application is: According to the preoperative plan for revision surgery, the primary replacement prosthesis is removed, and a special osteotomy tool is used to complete the radial neck osteotomy and the medullary cavity processing of the radial bone is completed using a medullary expansion tool. The appropriate size specification for the patient is determined through a trial mold (consistent with the prosthesis size). Next, the radial head 1, radial neck 2, and radial stem 3 of the selected specifications are assembled for the conical interface, and the correct alignment and installation and implantation of the prosthesis are completed through the force line marking line of the prosthesis. Subsequently, the interlocking screw 4 is fixed through a special interlocking nail guide. After the installation of the bone hard tissue is completed, the radial tuberosity biceps tendon reconstruction is sutured into the ligament suture holes 22 on both sides of the coronal position of the radial neck 2, and finally the fixation and revision replacement of the radial prosthesis are completed, so that the prosthesis has a more reliable fixation effect.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A modular artificial radial head revision prosthesis, characterized in that: The invention comprises three sections, namely a radial head (1), a radial neck (2) and a radial stem (3), wherein the radial head (1) is provided with an articular surface (11), the radial head (1) and the radial neck (2) are connected by a taper, the radial neck (2) and the radial stem (3) are connected by a taper, the neck of the radial head (1) forms a 10° to 15° eversion, and ligament suture holes (22) are provided on both sides of the coronal position of the radial neck (2).

2. The modular artificial radial head revision prosthesis according to claim 1, characterized in that: A first cone (21) is fixedly mounted on the radial neck (2), a first cone inner tapered hole (12) is formed on the radial head (1), the first cone (21) and the first cone inner tapered hole (12) are coaxially connected, the radial neck (2) and the radial stem (3) are connected via a second cone (31), the second cone (31) is fixedly mounted on the radial stem (3), the radial neck (2) is formed with a second cone inner tapered hole (25), the second cone (31) and the second cone inner tapered hole (25) are coaxially fixedly connected, and an angle of 10° to 15° is formed between a central axis of the first cone (21) and a central axis of the second cone inner tapered hole (25).

3. The modular artificial radial head revision prosthesis according to claim 2, characterized in that: The outer surface of the radial head (1) is provided with a first radial force line marking line (13), the first radial force line marking line (13) and the central axis of the first cone inner tapered hole (12) are parallel to each other, the outer surface of the radial neck (2) is provided with a second radial force line marking line (23) and a third radial force line marking line (24), the second radial force line marking line (23) and the central axis of the first cone (21), and the third radial force line marking line (24) and the central axis of the second cone inner tapered hole (25) are parallel to each other.

4. The modular artificial radial head revision prosthesis according to claim 3, characterized in that: The outer surface of the radial stem (3) is provided with a fourth radial force line marking line (32), and the fourth radial force line marking line (32) and the central axis of the second cone (31) are parallel to each other.

5. The modular artificial radial head revision prosthesis according to claim 1, characterized in that: The proximal surface of the radial stem (3) is sprayed with Ti, Ta or HA.

6. The modular artificial radial head revision prosthesis according to claim 5, characterized in that: The distal crown and the serrated surface of the radial stem (3) are fixed with interlocking screws (4).

7. The modular artificial radial head revision prosthesis according to claim 5, characterized in that: The surface of the radial handle (3) is provided with a distal arc groove (34).

8. The modular artificial radial head revision prosthesis according to claim 1, characterized in that: The radial stem (3) is provided with a transverse bone cement groove (37) and a longitudinal anti-rotation groove (38).

9. The modular artificial radial head revision prosthesis according to claim 8, characterized in that: The surface of the radial stem (3) is provided with a smooth surface or a sandblasted surface.

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