Knee joint posture measuring method based on feature point 3D reconstruction

Abstract

The invention relates to a knee joint posture measuring method based on feature point 3D reconstruction. The knee joint posture measuring method based on feature point 3D reconstruction comprises thefollowing steps of establishing a three-dimensional model of a knee joint, and obtaining space position parameters of an X-ray imaging system; respectively extracting position information of projecting points corresponding to six feature points in a left X-ray image and a right X-ray image; estimating position coordinates of each feature point in the three-dimensional space; calculating a quaternion q1 of a distal femur transforming to a projecting posture and a quaternion q2 of a proximal tibia transforming to the projecting posture; and according to the quaternion q1 and the quaternion q2, performing calculation to obtain a knee joint attitude angle, and determining the posture of the knee joint. According to the knee joint posture measuring method based on feature point 3D reconstruction disclosed by the invention, 3D reconstruction is performed on the six feature points in femurs and tibias of the knee joint, so that the influences of a registering process of iteration and artifactof parenchyma are avoided, the process is simple and convenient, the calculation amount is reduced, the calculation efficiency is improved, and the knee joint posture measuring method based on feature point 3D reconstruction has high accuracy.

Description

technical field [0001] The invention relates to the technical field of medical auxiliary equipment, in particular to a knee joint attitude measurement method based on three-dimensional reconstruction of feature points. Background technique [0002] The knee joint is the largest and most complex joint in the human body, and also the joint with the greatest degree of freedom. It participates in most sports in daily life and maintains the dynamic balance of the body. Due to the complex structure of the knee joint and the large amount of movement, the knee joint has a high injury rate in reality. The basic research on the three-dimensional kinematics of the knee joint helps to understand more comprehensively the relationship between the structure of the knee joint and its motor function, and is of great significance to the study of the mechanism of sports injuries, clinical diagnosis and guidance of rehabilitation training. In the stage of rehabilitation treatment, the ability ...

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Problems solved by technology

[0003] At present, it is a common method to use optical tracking measurement equipment to measure the motion posture of the knee joint, but this method has low accuracy due to the influence of soft tissue artifacts

In addition, the in-body measurement technology using 2D-3D registration is also a common method to measure the posture of the knee joint. Although this method is more accurate than the optical tracking system, the process is complicated and the calculation efficiency is relatively low.

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