Study title:~Functional evaluation of a standard and a high-flexion knee prosthesis using thigh-calf contact force measurements.~Objective:~The objective of this study is to investigate whether subjects receiving a high flexion knee prosthesis (Sigma RP-F, J&J, UK) show a better knee function than patients receiving a standard knee prosthesis (Sigma FB, J&J, UK).~Study Design:~Prospective double blind randomized study.~Study population:~Subjects who will receive total knee arthroplasty (TKA) because of invalidating gonarthritis based on primary osteoarthritis or rheumatic disorders or trauma.~Intervention:~28 subjects will receive the standard Sigma FB knee prosthesis.~28 subjects will receive the high flexion Sigma RP-F knee prosthesis.
The purpose of this study is to investigate whether subjects receiving a high-flexion knee prosthesis show a better knee function than patients receiving a standard knee prosthesis. Thigh-calf contact force measurements are used to quantify knee function. The investigators' hypothesis is that high-flexion knees show a better knee function.