Design method of a patella prosthesis

Abstract

The invention discloses a prosthesis design method to satisfy the movement function and biological function of the patella and achieve the purpose of replacing the hemipatella prosthesis. The design method of the prosthesis uses CT or MRI to obtain high-precision three-dimensional original data of the patient's knee joint, and uses reverse engineering to establish a three-dimensional model of the patella; establishes a cutting plane of the three-dimensional model of the patella through the feature points of the patella, and uses the cutting plane to cut the patella. Three-dimensional model Obtain the three-dimensional model A1 of the prosthesis design and the patella retention band A2; design the protrusion A3 on the cutting plane based on A1, and design the groove A4 matching A3 on the same position of the cutting plane based on A2 , to obtain the fixed structure of the half-patella prosthesis; the material of the half-patella prosthesis is polyether ether ketone; the mold of the personalized patella prosthesis is manufactured by additive manufacturing, traditional manufacturing or a combination of the two methods, and high-strength is obtained by injection molding Prosthetic structure and articular surface of the patella prosthesis with high surface finish.

Description

technical field [0001] The invention relates to the manufacture of a prosthesis, in particular to a design method of a patella prosthesis. Background technique [0002] It is well known that the knee joint is composed of the lower end of the femur, the upper end of the tibia, and the patella. It is the largest and most complex joint in the human body. Knee osteoarthritis is the most common musculoskeletal disease and the main cause of disability in middle-aged and elderly people. 85% Total knee replacement is due to knee osteoarthritis, knee replacements include: tibio-femoral arthroplasty and patella-femoral arthroplasty. Among them, tibial-femoral arthroplasty has been relatively mature technology, and the curative effect is relatively good. [0003] The patella is the largest sesamoid bone in the whole body. It is flat and millet-shaped. , down, left, and right movement is also the dynamic fulcrum of knee joint flexion and extension, which bears a lot of stress, usually...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no effective patella-femoral joint replacement prosthesis. The patellar prosthesis is designed to adapt to different anatomical characteristics and mechanical requirements. The innovative prosthesis technology is used to replace only the patella while retaining the complete articular surface of the patient's knee joint and the soft tissue around the joint ( ligaments, cartilage, fat pads, muscles / tendons), not only can fully restore the patient's motor function, but also can realize the complete reconstruction of biological function

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