Full wrist joint prosthesis with distal radioulnar joint

Abstract

The invention discloses a full wrist joint prosthesis with a distal radioulnar joint, and relates to the field of joint prostheses. According to the full wrist joint prosthesis with the distal radioulnar joint, due to the design that the joint head component in the joint component can rotate and can be contained in the joint nest component in the axial moving mode, accurate simulation of physiological movement of the distal radioulnar joint is achieved; the articular head component is allowed to rotate around multiple axes in the articular fossa component so as to be matched with anterior and posterior rotation actions of the forearm, and is allowed to slightly slide in the axial direction so as to simulate physiological translation of the ulna relative to the radius, so that the internal constraining force between prosthesis components in the forearm rotation process is reduced, and the anterior and posterior rotation of the anterior and posterior rotation of the anterior and posterior rotation of the anterior and posterior rotation of the anterior and posterior rotation of the anterior and posterior rotation is facilitated. A postoperative patient can obtain a rotation function closer to nature, and abnormal stress transmitted to a bone prosthesis interface due to movement mismatching is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of joint prosthesis technology, specifically to a total wrist joint prosthesis with a distal radioulnar joint. Background Technology

[0002] Total wrist joint prostheses are important implants used to treat advanced wrist arthritis, severe post-traumatic wrist injuries, and post-tumor resection reconstruction. Currently, clinically used total wrist joint prostheses are mainly divided into two categories: hinged restraint prostheses and semi-restraint ball-and-socket joint prostheses. Existing technologies mostly focus on reconstructing the radiocarpal joint between the distal radius and the proximal row of carpal bones. The prosthesis is fixed to the medullary canals of the radius and the second and third metacarpals through a prosthesis stem or anchor plate, respectively. The ball-and-socket structure or bearing structure is used to realize the flexion, extension, and radial and ulnar deviation of the wrist joint. These prostheses restore the overall range of motion of the wrist joint to a certain extent and relieve pain.

[0003] However, existing full wrist joint prostheses generally neglect the functional reconstruction of the distal radioulnar joint. Under physiological conditions, the distal radioulnar joint is formed by the annular articular surface of the ulnar head and the ulnar notch of the radius. It plays an important role in load transmission and motion guidance during forearm rotation. When the connection between the distal ulna and distal radius lacks a biomimetic structure, the pronation and supination movements of the forearm are significantly restricted, and abnormal torsional stress concentration occurs inside the prosthesis. Although some existing technologies attempt to simply hinge or rigidly connect the ulnar and radial prostheses, this design cannot simulate the physiological displacement of the ulna relative to the radius during rotation, resulting in a significant increase in shear stress between the prosthesis and the bone interface. Moreover, rigid connections or single hinge structures cannot buffer the axial impact force transmitted along the long axis of the ulna. During long-term use, this can easily cause mechanical fatigue of the prosthesis components or fretting wear of the bone cement interface. In order to address the shortcomings of existing technologies, this invention provides a full wrist joint prosthesis with a distal radioulnar joint to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a total wrist joint prosthesis with a distal radioulnar joint. Through a design where the articular head component is rotatably and axially movable within the glenoid socket component, it achieves precise simulation of the physiological movements of the distal radioulnar joint. Compared to existing hinged or simple ball-and-socket prostheses that only provide a single degree of rotational freedom, the articular head component of this invention allows for multi-axis rotation within the glenoid socket component to accommodate forearm pronation and supination movements, and also allows for slight axial sliding to simulate the physiological translation of the ulna relative to the radius. This reduces the internal constraint forces between prosthetic components during forearm rotation, enabling postoperative patients to achieve more natural rotational function and effectively reducing abnormal stress transmitted to the bone-prosthesis interface due to movement mismatch.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a total wrist joint prosthesis with a distal radioulnar joint, comprising: Radial prosthesis components are used for fixation to the distal radius; Ulnar prosthesis component, used to connect the distal end of the ulna; A joint component, connecting the radial prosthesis component and the ulnar prosthesis component, the joint component including a socket component and a head component, the head component being rotatably and axially movable within the socket component to simulate the movement of the distal radioulnar joint.

[0006] Preferably, the articular socket component is fixed to the radial prosthesis component, and its inner surface forms an arc-shaped concave surface to accommodate the articular head component.

[0007] Preferably, the articulated head component includes: The ball head is slidably accommodated within the arc-shaped concave surface; The rod body has one end connected to the ball head and the other end connected to the ulna prosthesis component.

[0008] Preferably, the rod body includes a multi-segment structure, including at least a first segment and a second segment. The first segment is slidably connected to the ball head, and an axial buffer is provided between the second segment and the first segment to absorb axial impact force.

[0009] Preferably, the ball head has a through arc-shaped channel inside, the rod body passes through the arc-shaped channel, the rod body has axial movement freedom within the arc-shaped channel, and the curvature of the arc-shaped channel guides the rod body to generate angular deflection during rotation, simulating multi-axis motion under physiological conditions.

[0010] Preferably, the inner wall of the arc-shaped channel is provided with a damping layer, which contacts the outer wall of the rod body to provide adjustable frictional resistance during axial movement and rotation.

[0011] Preferably, the radial prosthesis component includes an arc-shaped plate with multiple anchor pins for fixing to the distal radius bone. The arc-shaped plate is integrally formed with or detachably connected to the radial prosthesis component.

[0012] Preferably, an elastic sealing sleeve is fitted onto the rod body, one end of which is sealed to the ball head and the other end is sealed to the ulnar prosthesis component, so as to cover at least a portion of the rod body and prevent soft tissue from growing in.

[0013] Preferably, the ulna prosthesis component includes a screw for connecting to a threaded interface at the distal end of the ulna.

[0014] Preferably, the articular socket component is made of high molecular weight polyethylene material, and the articular head component is made of cobalt-chromium-molybdenum alloy or ceramic material.

[0015] The technical effects and advantages of this invention are as follows: 1. This total wrist joint prosthesis with distal radioulnar joint achieves precise simulation of the physiological movement of the distal radioulnar joint through the design of the articular head component being rotatably and axially movable within the articular socket component. Compared with existing hinged or simple ball-and-socket prostheses that only provide a single degree of rotational freedom, the articular head component of this invention allows for multi-axis rotation within the articular socket component to adapt to the pronation and supination movements of the forearm, and also allows for slight axial sliding to simulate the physiological translation of the ulna relative to the radius. This reduces the internal constraint force between the prosthesis components during forearm rotation, enabling postoperative patients to obtain more natural rotational function and effectively reducing abnormal stress transmitted to the bone prosthesis interface due to movement mismatch.

[0016] 2. This total wrist joint prosthesis with distal radioulnar joint has a multi-segment structure in the rod section, with an axial buffer between the first and second rod segments. Through the above structural design, the axial impact energy is buffered and dissipated. In daily activities, lifting or supporting actions generate instantaneous impact loads transmitted along the long axis of the ulna. When this load is transmitted to the rod section through the ulnar prosthesis component, the axial buffer absorbs the impact energy through elastic deformation, avoiding the direct action of rigid impacts on the contact interface between the ball head and the articular socket component, as well as the fixation interface of the radial prosthesis component. This reduces the risk of long-term mechanical loosening and articular surface wear of the prosthesis, and extends the in vivo service life of the prosthesis.

[0017] 3. This full wrist joint prosthesis with distal radioulnar joint features a structural design with a through-hole arc-shaped channel inside the ball head and a damping layer on the inner wall of the arc-shaped channel. This design enables precise guidance and dynamic stability of the multi-axis motion trajectory of the distal radioulnar joint. When the rod body undergoes axial displacement within the arc-shaped channel, the preset curvature of the channel guides the rod body to produce a synchronous angular deflection. This allows the ulnar prosthesis component to reproduce the dorsal translation during supination and the palmar translation during pronation under physiological conditions. At the same time, the continuous contact between the damping layer and the outer wall of the rod provides adjustable frictional resistance. This resistance simulates the passive stability provided by the original distal radioulnar joint ligament and joint capsule, preventing unnecessary wobbling of the prosthesis during rapid movements while preserving its flexibility. This enhances the bionic performance of the prosthesis and the patient's experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the planar structure of the present invention; Figure 3 This is a cross-sectional view of the joint component of the present invention; Figure 4 For the present invention Figure 3 Enlarged sectional view of the joint components in section A; Figure 5 This is a schematic diagram showing the overall structure of the present invention disassembled.

[0020] In the diagram: 100, radius prosthesis component; 110, arc-shaped plate; 200, ulna prosthesis component; 210, screw; 300, joint component; 310, articular socket component; 311, arc-shaped concave surface; 320, articular head component; 321, ball head; 322, rod body; 323, axial buffer; 324, arc-shaped channel; 325, damping layer; 3221, first rod segment; 3222, second rod segment. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention addresses the problem that existing designs cannot simulate the physiological displacement of the ulna relative to the radius during rotation, leading to a significant increase in shear stress between the prosthesis and bone interface. Furthermore, rigid connections or single hinge structures cannot buffer the axial impact force transmitted along the long axis of the ulna, easily causing mechanical fatigue of the prosthesis components or fretting wear of the bone cement interface during long-term use. Compared with existing hinged or simple ball-and-socket prostheses that only provide a single degree of rotational freedom, the articular head component of this invention allows for multi-axis rotation within the articular socket component to adapt to forearm pronation and supination movements, and also allows for slight axial sliding to simulate the physiological translation of the ulna relative to the radius. This reduces the internal constraint force between prosthesis components during forearm rotation, enabling postoperative patients to obtain more natural rotational function and effectively reducing abnormal stress transmitted to the bone prosthesis interface due to movement mismatch.

[0023] This embodiment discloses a total wrist joint prosthesis with distal radioulnar joint, according to the appendix. Figure 1 To be continued Figure 5 As shown, it includes a radial prosthesis component 100 for fixing to the distal radius, an ulnar prosthesis component 200 for connecting to the distal ulna, and a joint component 300 connecting the radial prosthesis component 100 and the ulnar prosthesis component 200. The joint component 300 simulates the structure of the original distal radioulnar joint. The joint component 300 includes a socket component 310 and a head component 320. The head component 320 is not only rotatably accommodated in the socket component 310, but also has a degree of freedom of axial movement, thereby precisely simulating the combined rotational and translational movements of the distal radioulnar joint under physiological conditions.

[0024] According to the appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, further, in order to optimize stress distribution and simplify the surgical installation process, the articular socket component 310 is preferably fixed to the radial prosthesis component 100. The inner surface of the articular socket component 310 forms a smooth arcuate concave surface 311. The radius of curvature of the arcuate concave surface 311 matches the curvature of the outer surface of the articular head component 320 housed therein, forming a low-friction articular pair. This ball-and-socket or near-ball-and-socket contact method provides a structural basis for multi-directional rotation.

[0025] According to the appendix Figure 3 and attached Figure 4As shown, further, to achieve complex three-dimensional motion, the articular head component 320 is designed as a composite structure, specifically including: a ball head 321 and a rod body 322. The outer diameter of the ball head 321 is slightly smaller than the inner diameter of the arc-shaped concave surface 311, so that it can be slidably accommodated in the arc-shaped concave surface 311 to achieve universal rotation. One end of the rod body 322 is connected to the ball head 321, and the other end extends along the ulnar axis and is fixedly connected to the ulnar prosthesis component 200. This design transmits the load from the ulna to the articular socket component 310 on the radial side through the rod body 322 and the ball head 321.

[0026] According to the appendix Figure 3 As shown, furthermore, in order to cope with the axial impact force generated during human physiological activities, such as the axial load when clenching a fist or lifting objects, and to prevent the prosthesis from loosening or being damaged due to rigid impact, the rod part 322 adopts a multi-segment structure design. The rod part 322 includes at least a first rod segment 3221 and a second rod segment 3222. The first rod segment 3221 is slidably connected to the ball head 321. An axial buffer 323 is provided between the second rod segment 3222 and the first rod segment 3221. The axial buffer 323 can be made of medical-grade ultra-high molecular weight polyethylene or polyetheretherketone elastomer. When the axial load increases, the gap between the first rod segment 3221 and the second rod segment 3222 decreases, compressing the axial buffer 323, thereby absorbing the impact energy. After the load disappears, the axial buffer 323 restores its deformation, pushes the rod segment to reset, and maintains the joint gap.

[0027] According to the appendix Figure 4 As shown, further, in order to achieve more biomimetic multi-axis motion within a limited space, including pronation, supination, and the accompanying slight ulnar oscillation, a through arc-shaped channel 324 is provided inside the ball head 321. The rod part 322 passes through the arc-shaped channel 324 and is not completely fixed, but is allowed to have a certain degree of axial movement freedom within the arc-shaped channel 324. More importantly, since the arc-shaped channel 324 itself has a certain curvature, when the rod part 322 moves or rotates within the arc-shaped channel 324, the inner wall of the channel will guide the rod part 322 to produce an angular deflection relative to the central axis of the ball head 321, thereby simulating the multi-axis motion trajectory guided by the radioulnar joint ligament under physiological conditions.

[0028] According to the appendix Figure 4As shown, furthermore, in order to control stability during movement, prevent unnecessary swaying of the articular head component 320, and simulate the resistance provided by soft tissue, the inner wall of the arc-shaped channel 324 is provided with a damping layer 325. The damping layer 325 can be made of medical silicone rubber with a high coefficient of friction or a wear-resistant coating. When the rod part 322 moves or rotates axially within the arc-shaped channel 324, the outer wall of the rod part 322 always remains in contact with the damping layer 325, thereby providing adjustable frictional resistance. By adjusting the material hardness or surface roughness of the damping layer 325, the tightness of the joint can be adjusted before or during surgery to achieve individualized stability.

[0029] According to the appendix Figure 1 and attached Figure 5 As shown, the radial prosthesis component 100 is not just a simple handle. The distal end of the radial prosthesis component 100 is provided with an arc-shaped plate 110. The curvature of the arc-shaped plate 110 matches the anatomical curvature of the palmar or dorsal side of the distal radius. The arc-shaped plate 110 has multiple screw holes and is equipped with multiple anchor screws. During surgery, the arc-shaped plate 110 is first attached to the radial surface, and then the multiple anchor screws are screwed into the distal radius bone to achieve initial stable fixation. The arc-shaped plate 110 can be integrally forged with the radial prosthesis component 100, or it can be designed as a separate piece, which can be detachably connected by dovetail grooves or screws, so that the installation position can be flexibly adjusted according to the osteotomy situation during surgery.

[0030] According to the appendix Figure 3 and attached Figure 5 As shown, in order to prevent postoperative fibrous tissue or scar tissue from growing into the active area of ​​the rod portion 322, leading to joint adhesion or dysfunction, an elastic sealing sleeve is fitted on the rod portion 322. This elastic sealing sleeve is made of biocompatible silicone rubber or polyurethane material and has elasticity. After installation, one end of the elastic sealing sleeve is sealed to the root of the ball head 321 through sutures or a retaining ring, and the other end is sealed to the proximal end of the ulnar prosthesis component 200. The elastic sealing sleeve completely covers the exposed rod portion 322, forming a physical barrier to prevent soft tissue ingrowth, while allowing the rod portion 322 to slide freely inside the elastic sealing sleeve.

[0031] According to the appendix Figure 5 As shown, it is particularly important to emphasize that the ulnar prosthesis component 200 is designed with a screw 210 to adapt to the medullary canal morphology of the distal ulna. The screw 210 has a precision thread on its surface, which is used to achieve a screw-in connection with the threaded interface pre-taped at the distal ulna. This threaded connection method can provide axial and rotational stability and prevent the prosthesis from micromoving or sinking in the ulna. Depending on the different diameters of the ulnar medullary canal, the screw 210 can be designed in a series of specifications with different diameters and lengths for selection during surgery.

[0032] According to the appendix Figure 3 As shown, it is particularly important to emphasize that, in order to reduce the wear rate of the articular surfaces and extend the service life of the prosthesis, the joint component 300 adopts a combination of materials with a low coefficient of friction. The articular socket component 310 is made of high molecular weight polyethylene with excellent wear resistance. This material has a certain degree of toughness and can accommodate metal or ceramic ball heads well. In contrast, the articular head component 320 is made of high hardness, high smoothness cobalt-chromium-molybdenum alloy or bioceramic material, such as zirconium oxide toughened high-purity alumina-based composite material. This combination of metal / ceramic and polyethylene is a commonly used combination in the field of artificial joints, which reduces the friction of the prosthetic joint movement position.

[0033] Example 1: This example uses a standard total wrist arthroplasty for degenerative wrist arthritis as an example, combined with the appendix... Figure 1 To be continued Figure 5 The assembly and workflow are explained in detail below: The surgery begins with a distal radius osteotomy, followed by medullary reaming and implantation of a radial prosthesis component 100. This component is then securely fixed to the radius using an arc-shaped plate 110 and anchor pins. Next, the distal ulna is osteotomized and tapped. The screw 210 of the ulnar prosthesis component 200 is then screwed into the ulnar medullary cavity. Subsequently, the joint component 300 is assembled: the rod portion 322 of the articular head component 320 is inserted into the arc-shaped channel 324 of the ball head 321. After confirming that the damping layer 325 provides appropriate friction, the assembled joint is then... The ball head 321 of the head component 320 is aligned with and pressed into the arcuate concave surface 311 of the articular socket component 310 to form a complete joint. Finally, the end of the rod body 322 is locked to the connection end of the ulnar prosthesis component 200. After the operation, when the patient rotates the forearm, the ball head 321 rotates in the arcuate concave surface 311, while the rod body 322 slides slightly axially in the arcuate channel 324 according to the rotation requirements and is accompanied by angular deflection, perfectly simulating the function of the normal radioulnar joint.

[0034] Example 2: This example uses a manual laborer with severe osteoporosis or a high expected axial load as an example, combined with the attached... Figure 3 To be continued Figure 5 The working principle and workflow of its buffer are explained in detail below: The implantation process is the same as in Example 1. When the patient lifts a heavy object after recovery, the axial impact force is transmitted from the hand through the wrist bone to the ulnar prosthesis component 200. The impact force is transmitted proximally along the rod portion 322. At this time, since the rod portion 322 adopts a multi-segment structure, the impact force first acts on the second rod segment 3222. The second rod segment 3222 then presses the axial buffer 323 proximally. The axial buffer 323 undergoes elastic deformation, converting the instantaneous rigid impact into slowly released elastic potential energy, reducing the peak stress transmitted to the ball head 321 and the articular socket component 310. When the heavy object is put down and the load disappears, the axial buffer 323 elastically recovers, pushing the second rod segment 3222 and the first rod segment 3221 back into place, maintaining the normal tension of the joint, thereby effectively protecting the prosthesis fixation interface and preventing long-term loosening.

[0035] Example 3: This example uses a young patient requiring highly biomimetic motor function as an example, combined with... Figure 4 The multi-axis motion guidance principle and workflow are explained in detail below: After implantation, when patients perform daily activities such as forearm supination (i.e., turning the palm upward), the distal ulna relative to the distal radius not only needs to rotate but also undergoes a complex dorsal translation. In this prosthesis, when the ulnar prosthesis component 200 moves the rod portion 322, the ball head 321 is constrained within the articular socket component 310, forcing the rod portion 322 to move along the arcuate channel 324 inside the ball head 321. Since the curvature of the arcuate channel 324 is pre-designed based on physiological data, when the rod portion 322 moves axially, the guiding effect of the channel wall forces the rod portion 322 to undergo a corresponding angular deflection while moving, thereby causing the ulnar prosthesis component 200 to perform dorsal translation and rotation consistent with physiological movements, achieving biomimetic kinematic performance that surpasses simple hinge or ball joint structures.

[0036] Example 4: This example uses a case of revision surgery or severe bone defect requiring enhanced fixation as an example, combined with the attached... Figure 1 and attached Figure 5 The assembly and workflow are explained in detail below: For patients with poor bone quality, the fixation of standard prostheses may not be secure enough. In this embodiment, the radial prosthesis component 100 adopts a split design. During the operation, the arc-shaped plate 110 with a porous trabecular bone structure is first fixed to the relatively healthy cortical bone of the radius with multiple long screws. The arc-shaped plate 110 provides mechanical stability, and its porous surface is conducive to long-term bone ingrowth. Then, the radial prosthesis body connected with the articular socket component 310 is precisely docked and locked to the arc-shaped plate 110 that has been fixed to the radius through a locking mechanism. This modular design allows doctors to prioritize the most difficult fixation problem before installing the articular surface part, which greatly reduces the difficulty of the operation and improves the initial stability and long-term survival rate. The assembly and movement of the remaining joint components 300 are the same as in Embodiment 1.

[0037] In summary, this invention achieves precise simulation of the physiological movements of the distal radioulnar joint by arranging the articular head component within the articular socket component in a design that allows for rotation and axial movement. Compared to existing hinged or simple ball-and-socket prostheses that only provide a single degree of rotational freedom, the articular head component of this invention allows for multi-axis rotation within the articular socket component to accommodate forearm pronation and supination movements, and also allows for slight axial sliding to simulate the physiological translation of the ulna relative to the radius. This reduces the internal constraint forces between prosthetic components during forearm rotation, enabling postoperative patients to achieve more natural rotational function and effectively reducing abnormal stress transmitted to the bone-prosthesis interface due to movement mismatch.

[0038] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A total wrist joint prosthesis with distal radioulnar joint, characterized in that, include: Radial prosthesis component (100) for fixation to the distal radius; Ulnar prosthesis component (200) for connecting the distal end of the ulna; A joint component (300) is connected between the radial prosthesis component (100) and the ulnar prosthesis component (200). The joint component (300) includes a socket component (310) and a head component (320). The head component (320) is rotatably and axially movable within the socket component (310) to simulate the movement of the distal radioulnar joint.

2. The total wrist joint prosthesis with distal radioulnar joint as described in claim 1, characterized in that, The articular socket component (310) is fixed to the radial prosthesis component (100), and its inner surface forms an arc-shaped concave surface (311) for accommodating the articular head component (320).

3. The total wrist joint prosthesis with distal radioulnar joint as described in claim 2, characterized in that, The articular head component (320) includes: The ball head (321) is slidably accommodated within the arcuate concave surface (311); The rod body (322) is connected at one end to the ball head (321) and at the other end to the ulnar prosthesis component (200).

4. The total wrist joint prosthesis with distal radioulnar joint as described in claim 3, characterized in that, The rod body (322) includes a multi-segment structure, including at least a first rod segment (3221) and a second rod segment (3222). The first rod segment (3221) is slidably connected to the ball head (321), and an axial buffer (323) is provided between the second rod segment (3222) and the first rod segment (3221) to absorb axial impact force.

5. The total wrist joint prosthesis with distal radioulnar joint as described in claim 3, characterized in that, The ball head (321) has a through arc-shaped channel (324) inside, the rod body (322) passes through the arc-shaped channel (324), the rod body (322) has axial movement freedom in the arc-shaped channel (324), and the curvature of the arc-shaped channel (324) guides the rod body (322) to generate angular deflection during rotation, simulating multi-axis motion under physiological conditions.

6. The total wrist joint prosthesis with distal radioulnar joint according to claim 5, characterized in that, The inner wall of the arc-shaped channel (324) is provided with a damping layer (325), which contacts the outer wall of the rod body (322) to provide adjustable frictional resistance during axial movement and rotation.

7. The total wrist joint prosthesis with distal radioulnar joint as described in claim 1, characterized in that, The radial prosthesis component (100) includes an arc-shaped plate (110) with multiple anchor pins for fixing to the distal radius bone. The arc-shaped plate (110) and the radial prosthesis component (100) are integrally formed or detachably connected.

8. The total wrist joint prosthesis with distal radioulnar joint as described in claim 3, characterized in that, An elastic sealing sleeve is fitted on the rod body (322). One end of the elastic sealing sleeve is sealed to the ball head (321), and the other end is sealed to the ulnar prosthesis component (200) to cover at least a portion of the rod body (322) and prevent soft tissue from growing in.

9. The total wrist joint prosthesis with distal radioulnar joint according to claim 1, characterized in that, The ulna prosthesis component (200) includes a screw (210) for connection to a threaded interface at the distal end of the ulna.

10. The total wrist joint prosthesis with distal radioulnar joint according to claim 1, characterized in that, The socket component (310) is made of high molecular weight polyethylene material, and the head component (320) is made of cobalt chromium molybdenum alloy or ceramic material.

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