Patient: Description of condition (onset, main symptoms, hospital visited, etc.): The left leg is stiff and cannot be bent. My father was in a car accident six or seven years ago and suffered a comminuted fracture, now his left leg is stiff and cannot be bent, is there any treatment? He was treated in the hospital after the accident! Doctor: The stiffness of the leg after the fracture should occur more commonly in the femur on the crush fracture, mainly caused by the adhesion of the knee extension device, if the intra-articular cartilage is okay and the force line of the lower limb is close to normal, arthroscopic release of the knee can be considered, if the adhesion is serious and the knee extension device contracture is severe, open surgery may be required to release, if the knee bone damage is serious, the possibility of joint replacement is not ruled out. Please upload X-rays.