Location method of instantaneous central axis and instantaneous central surface of human knee joint extension and flexion

Abstract

The invention discloses a human knee joint extension and flexion movement instantaneous center axis and instantaneous center curved surface positioning method which includes the step of acquiring image of human knee joint and the process of positioning the knee joint extension and flexion movement instantaneous center according to the image of the human knee joint. In the human knee joint extension and flexion movement instantaneous center axis and instantaneous center curved surface positioning method, according to the image data of the human knee joint bony structure acquired by a computer and the curvature change of the human knee joint femoral condyle articular surface, instantaneous center axis and instantaneous center curved surface data in the human knee joint extension and flexion movement are calculated so as to facilitate design of knee joint artificial prosthesis, orthopedic braces and rehabilitation assistant devices and functional evaluation on the human knee joint pathology.

Description

technical field [0001] The invention relates to a positioning method, in particular to a positioning method for an instantaneous central axis and an instantaneous central curved surface of human knee joint extension and flexion. Background technique [0002] The knee joint is one of the most complicated joints in the human body. The femoral condyle is not perfectly circular, but flat in the middle with a larger radius of curvature, and the posterior and anterior parts are approximately circular with a smaller radius of curvature. The curvature of the articular surface of the two condyles is also different. The extension and flexion of the knee is carried out on the sagittal plane around the transverse axis, and its central axis of rotation is not on the knee joint line, but runs through the posterior and superior sides of the two femoral condyles. The displacement constitutes the center surface of revolution. Therefore, the extension and flexion of the knee has kinematic s...

AI Technical Summary

Problems solved by technology

It is the complex nature of the knee joint kinematics that requires the design and manufacture of an artificial knee prosthesis with a femoral condyle component with a non-uniform curvature radius and a matching joint spacer component; Rehabilitation aids only use a single rotation axis design, which does not match the anatomical extension and flexion of the knee joint, and cannot adapt to the kinematic needs of the human knee joint, which affects the treatment and rehabilitation of knee joint diseases; in addition, due to the human knee joint Due to the existence of individual differences in anatomical structure, there is an individualized precision medical demand for knee prosthesis design, orthopedic braces and rehabilitation aids

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