Manufacturing method and evaluation method of short-stem femur prosthesis formed by 3D printing of metals

Abstract

The invention relates to a manufacturing method and evaluation method of short-stem femur prosthesis formed by 3D printing of metals, in particular to the field of medicines. The manufacturing methodcomprises the steps of S1, obtaining CT images of femurs by scanning; S2, according to the CT images of the femurs, performing modeling to obtain a femur three-dimensional solid model; S3, based on the femur three-dimensional solid model, extracting a femur marrow cavity outline; S4, according to the femur marrow cavity outline and a conical flat stem scheme, obtaining a first prosthesis; S5, enabling the inner side of the upper segment of the first prosthesis to be matched with the arc of the inner side of a femoral calcar; S6, enabling stem outer side shoulders to be in contact with the inner side of greater trochanters; S7, according to a femur physical force line, designing a prosthesis middle axle of the first prosthesis to obtain a second prosthesis of which the cross section is in the wedge shape that the outer part is wide and the inner part is narrow; and S8, performing image fit on the second prosthesis to enable the upper part of the second prosthesis to be in entire interference force fit to a first preset value. The manufacturing method and the evaluation method solve the technical problem that how to improve the properties of the femur prosthesis, and are suitable forhip joint replacement surgery.

Description

technical field [0001] The invention relates to the field of medicine, in particular to a method for manufacturing and evaluating a metal 3D printed short-handle femoral prosthesis. Background technique [0002] Artificial hip replacement is the most effective way to treat end-stage hip joint disease. It can quickly relieve pain, rebuild and restore hip joint function. It is known as the most successful orthopedic surgery since the 20th century. The long-term efficacy of traditional cementless femoral prosthesis has been confirmed, but there are still some common problems. First of all, the traditional prosthesis has obvious stress shielding on the proximal femur, which is an important factor causing aseptic loosening or even revision of the prosthesis. Secondly, as more and more young patients with high demand for exercise undergo total hip replacement due to femoral head necrosis and other reasons, the demand for minimally invasive surgery is increasing, and the tradition...

AI Technical Summary

Problems solved by technology

Because the femoral medullary cavity of each individual is inconsistent, and some shapes are quite different, most of the short-stem prostheses that adopt the design concept of metaphyseal fixation often do not match the femoral medullary cavity, and repeated reaming is required to adapt to the shape of the prosthesis. It is easy to cause periprosthetic fractures due to excessive press-fitting of the prosthesis, and excessive postoperative subsidence of the prosthesis due to insufficient press-fitting of the prosthesis and improper shape

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