Partial replacement trapezium prosthesis and manufacturing method thereof

Abstract

The invention discloses a partial replacement trapezium prosthesis and a manufacturing method thereof. The partial replacement trapezium prosthesis comprises a prosthesis body, wherein arc-shaped connecting holes are formed in the palm side, the back side and the radial side of the prosthesis body; the arc-shaped connecting holes are obliquely formed relative to the bottom face of the prosthesis body; and a connecting column integrally formed with the prosthesis body is arranged at the near end of a central shaft of the prosthesis body. The palm side of the body has an arc surface matched withfirst metacarpal bone. The manufacturing method comprises the steps that wrist CT scanning is carried out on a healthy volunteer and a patient respectively, three-dimensional reconstruction is carried out through medical software, simulation cutting is carried out on a reconstructed trapezium model, equal-ratio scaling is carried out on the remaining trapezium model after the healthy volunteer iscut off, so that the remaining trapezium model is matched with the base joint surface of the first metacarpal bone of the patient in terms of size and curved surface, and the trapezium prosthesis isobtained through 3D printing. According to the method, part of the trapezium in the hand osteoarthritis can be partially replaced, the stability of the wrist joint structure can be well kept, the first metacarpal bone is prevented from settling, joint pain is relieved, joint movement is increased, and high clinical prospects are realized.

Description

technical field [0001] The invention relates to the field of medical supplies, in particular to a partially replaced trapezoid bone prosthesis and a manufacturing method thereof. Background technique [0002] Osteoarthritis is one of the common diseases in middle-aged and elderly people. The most common site of hand osteoarthritis is the first carpometacarpal joint. According to statistics, up to 8% of men and 25% of women over the age of 50 suffer from degenerative arthritis of the thumb carpometacarpal (CMC) joint. The imaging manifestations of CMC arthritis are mainly narrow joint space, marginal bone sclerosis and osteophyte; the main clinical manifestations are pain and fatigue in the first carpometacarpal joint, and in severe cases, joint subluxation, decreased range of motion or stiffness may occur, resulting in Decreased thumb mobility, especially grip and pinch strength. [0003] For the above-mentioned CMC diseases, when drug treatment is ineffective, surgical i...

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Problems solved by technology

[0004] However, the above-mentioned surgical methods have their own disadvantages: the use of silicone prosthesis filling technology, postoperative complications such as periarticular synovitis, prosthesis falling off, etc.

The gap left after the resection of the trapezium brings potential hidden dangers to the subsidence of the first metacarpal, further affecting the stability of the postoperative joint structure

Another study showed that trapezoidectomy can cause distal scaphoid instability, which in turn leads to secondary non-dissociated dorsal insertion wrist instability

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