The anterior cruciate ligament reconstructed (ACL-R) knees suffer from a higher risk for osteoarthritis (OA) which is the major leading cause of disability[1]. In order to understand the mechanism of knee injury and the development of OA, precise 3-D knee joint motion is often determined by invasive, or radioactive approaches[2]. For studying daily activities like walking which has larger range of motion (ROM), the skin marker-based technique remains the only feasible way[3].

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