Knee joint biomechanical characteristic measuring device and measuring method based on body surface images

Abstract

The invention discloses a knee joint biomechanical characteristic measuring device and measuring method based on body surface images. The measuring device comprises a track, a transmission gear, a movable sliding block, a movable clamp, a fixed clamp, a camera and the like, wherein the transmission gear drives the movable sliding block to reciprocate along the track; and the movable sliding block can be respectively provided with a movable rod or pedal with the movable clamp to drive an in-vitro or in-vivo knee joint to make a flexion movement. The measuring method comprises the following steps: fixing a knee joint to be tested by using the measuring device, making a mark point array on a body surface test zone, shooting to record the time sequence images of the mark point array along the flexion movement of the knee joint, and extracting the relative movement of each point of the mark point array by using the image technology, thereby obtaining the strain distribution information, flexion information and relationship of the corresponding zone of the knee joint. The invention can be used for measuring the knee joint movement and the corresponding tissue strain in real time in a noninvasive, harmless, non-contact, quick, accurate and simple way without complex three-dimensional computation, ray scanning and the like, and offers greater degree of freedom to the test motion.

Description

technical field [0001] The invention relates to the field of research on biomechanical characteristics, in particular to a device and method for measuring biomechanical characteristics of knee joints based on body surface images. Background technique [0002] Human joints have always been one of the hotspots and difficulties in subject research, and the knee joint is the largest joint in the human body, involving femur, tibia, patella, etc. At the same time, the motion mechanism of the knee joint is extremely complicated; even for daily walking, the rotation axis of the knee joint It is not fixed on a single plane, but a comprehensive result of rotation, translation and other movements, and its force during movement will be very complicated and violent. Because of these factors, the knee joint is also one of the most vulnerable areas in the human body; it can be seen that the measurement and research of the biomechanical properties of the knee joint are of great significance...

AI Technical Summary

Problems solved by technology

The three-dimensional finite element numerical simulation method of the knee joint requires continuous CT scanning of the knee joint of the subject to establish a three-dimensional reconstruction model, and then obtains the biomechanical characteristics of the knee joint through simulation analysis. For the test samples of multiple testers, It has the disadvantages of long time consumption, high investment, high cost, many models but small sample size of a single model, which is not convenient for statistical analysis. The measurement error is large, and for in vivo testing, the subjects will have concerns about health hazards; based on the strain gauge direct paste measurement method, the strain gauge is directly pasted on the tissue area to be studied, and the deformation of the strain gauge is used to study the tissue. Biomechanical properties, but in the measurement process, the strain range of the strain gauge often does not reach the strain scale of the soft tissue, and only one-dimensional strain information along the direction of the strain gauge can be measured

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