Knee joint defect cushion block and manufacture method therefor

Abstract

The invention relates to a knee joint defect cushion block and a manufacture method therefor. The method comprises the following steps: obtaining a tibia model, and exporting the tibia model into Magics software; rebuilding a knee joint prosthesis model and exporting the knee joint prosthesis model into the Magics software; completing matching of the tibia model and the knee joint prosthesis model, fabricating a medial bone defect of a tibia plateau, completing implantation of a cushion block and conducting meshing; applying working conditions and constraints on an overall model which is constituted of the heterogeneous tibia model and the knee joint prosthesis model in Hypermesh software and conducting finite element analysis; and carrying out topological optimization analysis, wherein ifthe optimized gradient-meshed cushion block satisfies preset changing indexes, additive manufacturing is carried out to obtain the knee joint defect cushion block. The knee joint defect cushion blockhas a mesh architecture as a whole, so that elastic modulus is further reduced, stress shielding is reduced, osseointegration between the cushion block and a tibia under the cushion block can be promoted, and stability of a knee joint prosthesis is enhanced.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a knee joint defect pad and a manufacturing method thereof. Background technique [0002] Total knee arthroplasty (TKA) can effectively relieve pain and restore function in patients with advanced arthritis. In patients with severe knee osteoarthritis, varus deformity of the knee joint and bone defect of the tibial plateau are common, and when the bone defect is severe and noncontained (eg, figure 1 As shown), the conventional knee prosthesis is difficult to maintain stability. At this time, it is necessary to use a defect block to effectively fill the defect and maintain the stability of the prosthesis to ensure the therapeutic effect of total knee arthroplasty (such as figure 2 shown). [0003] However, at present, the materials used for knee prosthesis are mostly stainless steel, titanium and its alloys, and cobalt-chromium-molybdenum alloy. The elastic modulus of th...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a knee joint defect pad and its manufacturing method for the problems of increased stress shielding phenomenon and inability to complete osseointegration with the lower tibia existing in the existing total knee arthroplasty.

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