Estimation of in-vivo joint contact forces and muscle forces during walking is important in order to protect the knee joint from injury or provide adequate rehabilitation and exercise protocols [1]. Assessment of muscle forces can help to understand the neuro-muscular coordination related on neurological problems [2]. Accurate quantification of joint contact forces can help to characterize the contact phenomena of articular cartilage at the joint related on osteoarthritis and to improve the implant design for the longevity of joint arthroplasty [3].

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