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A Comparative Study on the Biomechanics of the Native Human Knee Joint and Total Knee Arthroplasty

Functional outcome after total knee arthroplasty is determined by strength, stability and range of motion. Flexion in the replaced knee is suboptimal for many patients and kinematics after total knee arthroplasty is abnormal. The relation between kinematics of the replaced knee and postoperative exion is analysed and compared to normal knee kinematics. Specic characteristics that relate to better exion are dened: posterior condylar offset, femoral rollback and external femoral rotation during exion relate to a better post-operative range of motion. A rationale for a guided motion knee arthroplasty is developed and positioned within the current state of the art knowledge on total knee arthroplasty.