Knee joint motion analysis method and system

By directly reconstructing the spatial coordinate system of the bone from the feature points of the double-plane image, the high computational complexity and applicability of traditional knee motion analysis methods are solved, and fast and low-cost knee kinematic analysis is achieved.

CN116172590BActive Publication Date: 2025-08-22SHANGHAI TAOIMAGE MEDICAL TECH CO LTD
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Patent Information

Application Number
CN202310045742.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-30
Publication Date
2025-08-22
Estimated Expiration
2043-01-30

AI Technical Summary

Technical Problem

Traditional knee motion analysis methods rely on two-dimensional-three-dimensional registration and statistical shape models, have high computational complexity and cannot be effectively applied to subjects with skeletal deformities, requiring manual intervention and high computational costs.

Method used

By directly reconstructing the spatial coordinate system of the bone from the feature points of the two-plane image, X-ray equipment is used to take X-ray images at multiple different moments, marking two-dimensional anatomical feature points, establishing a local coordinate system, and calculating the rotation matrix and displacement vectors to obtain knee kinematic parameters.

Benefits of technology

Fast kinematic analysis of knee joints without three-dimensional model reconstruction is realized, reducing computational complexity, increasing the generalization level of subjects with skeletal deformity, and reducing manual intervention.

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Abstract

The present invention relates to the field of motion analysis technology and provides a knee joint motion analysis method, comprising: S1: placing the knee joint in two X-ray devices and continuously taking X-ray images at different times; S2: marking two-dimensional anatomical feature points on the two X-ray images taken at the same time; S3: connecting the virtual X-ray light sources of the two X-ray devices with the two-dimensional anatomical feature points on the images, and using the intersection of the two connecting lines or the midpoint of the line segment with the closest distance between the two connecting lines as a three-dimensional anatomical feature point; S4: repeating step S3 to obtain a set of three-dimensional anatomical feature points of the knee joint; S5: establishing a local coordinate system including the femur, tibia, and patella based on the three-dimensional anatomical feature points in the set, and for any two coordinate systems, calculating the rotation matrix and displacement vector of one coordinate system relative to the other coordinate system to obtain the kinematic parameters of the patellofemoral and tibiofemoral joints. The spatial coordinate system of the bone is directly reconstructed from the feature points of the biplane images, thereby achieving rapid knee joint kinematic analysis.
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