Design method of kneecap prosthesis

Abstract

The invention discloses a design method of a prosthesis so as to meet motion functions and biological functions of kneecaps, and achieve the purpose of semi-kneecap prosthesis exchange. The design method of the prosthesis comprises the steps of obtaining high-precision three-dimensional raw data of the knee joint of a patient through CT or MRI, and constructing a kneecap three dimensional model bya reverse engineering method; and according to the feature points of the kneecaps, constructing the cutting plane of the kneecap three dimensional model, and by using the cutting plane, cutting the kneecap three dimensional model to obtain a three dimensional model A1 designed according to the prosthesis and a kneecap reserving band A2; and based on A1, designing a protrusion A3 on the cutting plane, and besides, based on A2, designing a groove A4 corresponding to the A3 in the position same as the cutting plane, to obtain a semi-kneecap prosthesis fixing structure. The semi kneecap prosthesis material is polyetheretherketone. A mold adopting a material increasing manufacturing method, a conventional manufacturing method or a combination of the material increasing manufacturing method andthe conventional manufacturing method is adopted for manufacturing the personalised kneecap prosthesis. Through an injection molding method, a high strength prosthesis structure and a high surface finish kneecap prosthesis articular facet are obtained.

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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