Dynamic loading platform for in-vitro knee joint, and application method thereof

Abstract

The invention discloses a dynamic loading platform for an in-vitro knee joint, and an application method thereof. The dynamic loading platform comprises an experiment table, a mechanical arm system, amotion capture system, a non-contact full-field strain measurement system and an industrial personal computer; the motion capture system establishes a three-dimensional space coordinate system of a knee joint sample by setting mark points, and acquires space position data of the mark points in real time when the knee joint sample performs continuous functional motion; the non-contact full-field strain measurement system obtains displacement data and strain distribution of speckles on the surface of a knee joint sample by using a digital image correlation technology based on a binocular visionprinciple; MATLAB software is arranged in the industrial personal computer, and the tail end of a mechanical arm is controlled to drive the knee joint sample to perform functional action; spatial position data of the mark points are received, and a stability evaluation report of the knee joint sample is obtained; and speckle displacement data are received, and a strain analysis report is obtainedthrough a digital image related technology. According to the invention, mechanical test and motion function test requirements are met, the experiment time cost and learning cost are reduced, and theexperiment efficiency is improved.

Description

technical field [0001] The invention relates to the field of biomechanical experiments of isolated knee joints, in particular to a dynamic loading platform of isolated knee joints and an application method thereof. Background technique [0002] The knee joint is a synovial joint composed of femur, tibia, fibula, patella, and numerous muscles, ligaments, cartilage and other soft tissues ( synovial joint ), is the largest and most complex joint in the human body, and it is also the joint most vulnerable to injury. Ligaments, especially the anterior cruciate ligament (ALL), are important structures to maintain the stability of the knee joint. Studies have shown that 80% of knee ligament injuries involve ACL injuries, and the incidence of the latter is as high as 2 million cases worldwide every year. Therefore, it is a very important topic for the stability assessment and motor function test of the knee joint. However, the postoperative satisfaction rate of patients with exist...

AI Technical Summary

Problems solved by technology

[0008] 2) The force measurement feedback loop is complex or lacks function

[0009] 3) Fast and flexible 6 degrees of freedom control cannot be realized for sample driving

[0010] 4) The function is single, and the stability test of the knee joint cannot be completed;

[0011] 5) The strain distribution of core soft tissues such as ligaments / artificial ligaments cannot be observed

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