Abstract: The present study introduced a new motion analysis method for total hip arthroplasty (THA). A motion simulation module of THA was designed and developed, which can simulate the THA’s implantation condition and motion and detect the theoretic range of motion (ROM) before the prosthetic component impingement happens. The impingement risk of THA should be investigated through comparing the analysis data of module with the realistic kinematics obtained from hip motion measurement. Furthermore, in order to demonstrate how to use this module, the kinematic data of the hip were recorded by measuring the lower limbs motion of general population in six activities of daily living (ADLs), i.e., kneeling, squatting, ascending stair, descending stair, walking, and jogging. Analysis results showed that the possibilities of impingement and dislocation were larger during the squatting activity. It is reasonable to believe that the motion simulation module of THA in the present study is helpful for clinical medicine engineering, and hip implant design and optimization.

Key words: Hip, Impingement, Dislocation, Activity of daily living (ADL), Total hip arthroplasty (THA), Motion simulation

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