Joint replacement surgery is an effective treatment for severe joint diseases, but the postoperative recovery process is complex and lengthy. Preoperative rehabilitation training, as an important part of preoperative preparation, has been proven to significantly improve postoperative recovery outcomes. However, there is currently a lack of systematic research on the optimal protocols and duration of preoperative rehabilitation training and their specific impacts on postoperative recovery. This study aims to evaluate the effects of preoperative rehabilitation training on postoperative recovery after joint replacement through a randomized controlled trial, providing scientific evidence for clinical practice.