The majority of patients undergoing total knee arthroplasty are elderly individuals with low functional demands, aiming to alleviate pain. However, there exists a subgroup of younger patients, under the age of 65, with higher functional demands. The purpose of this study is to evaluate the return to sports activities in this patient group following a non-cemented total knee arthroplasty procedure and a specific rehabilitation protocol. The investigators expect that with the use of non-cemented prostheses and a specific rehabilitation protocol, many of these patients will safely resume sports activities.