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Abstract
Background: Total knee replacement (TKR) has evolved to a successful operation with acceptable longevity. Post-operative rehabilitation is very important to compensate functional deficits post-operatively. Aim of the study: to measure the mechanical changes of screw home mechanism (knee locking mechanism) of the knee joint after TKR, in addition to assess if there is a correlation between screw home mechanism and patient lower limb function. Study design and Methodology: Pre-test post-test study design with control group. The material included thirty consecutive patients with knee osteoarthritis who were candidate for unilateral total knee replacement as experimental group; another thirty normal subjects were included in this study as a control group. Both groups were matching in age, weight, height and body mass index. Helft{u2019}s test , Knee Society Scoring System (KSS) and the Lower Extremity Functional Scale (LEFS) were studied preoperatively and six months postoperatively in experimental group, at the beginning of the study and after six months in control group