Ankylosis of the knee is a condition that can have a significant impact on the function of the patient. Ankylosis is a condition in which the knee joint does not move at all, as if the bearings are completely rusted; stiffness is a condition in which the knee joint has some flexion and extension, but much less function than a normal knee joint. Think about it, if a person’s lower limb is a straight leg, he will definitely walk with a limp, and it will have a huge impact on daily life, such as not being able to ride a bicycle, having difficulty sitting in a chair, not being able to squat and poop, etc. Therefore, it is very important to prevent knee stiffness and stiffness. Trauma around the knee joint is the most likely cause of knee stiffness. Most of the causes of knee stiffness are due to soft tissue factors, both intra-articular and extra-articular, and extra-articular causes include muscle-bone adhesions and muscle contractures. Intra-articular adhesions are like a bearing with a long rusty interior, thus rusting its moving parts together and affecting the activities of the bearing; muscle contracture is like wearing a pair of very thin pants, and when we bend our legs, the tight pants restrict our activities; in addition, one of the activities of our knee joint is the patella (that is, the kneecap) sliding on the femoral condyles that expand at the lower end of the thigh, and This sliding is caused by the pulling of the quadriceps tendon, and if the quadriceps tendon sticks to the thigh bone, then it loses its role in pulling the patella to cause sliding, which also limits the movement of the knee joint, and this is the factor of muscle adhesions around the knee joint. In fact, when surgery is done for joint release, several of these factors are often present at the same time, and the most serious is usually adhesions of the quadriceps tendon. The cause of knee stiffness has been identified, so how can it be prevented? In fact, the best way to prevent it is early exercise in knee flexion and extension, which in turn requires good fixation of the fracture around the knee in order to create good conditions for knee motion. The more aggressive physicians now require knee flexion and extension exercises immediately after fracture surgery, even if the fracture end does not grow, because the function of the joint is more important than the fracture. Prevention is more important than cure in the prevention and treatment of joint stiffness! The Department of Orthopedics of the Ninth Hospital is the Shanghai Clinical Medical Center of Joint Surgery, a national key discipline, with the Department of Rehabilitation, and the rehabilitation work is done by the intervention of the Department of Rehabilitation Medicine. Whether it is fracture patients in the trauma ward or joint replacement and arthroscopic patients in the joint ward, they receive safe, standardized, scientific and effective rehabilitation treatment in the early postoperative period, and the bedside functional exercises promote the recovery of joint and limb functions to the greatest extent, while avoiding the occurrence of joint stiffness to the greatest extent. Unfortunately, such a model of perioperative rehabilitation in orthopedic wards is far from popular in China. For joint stiffness that has already occurred, early stage patients can go to the rehabilitation clinic to receive conservative rehabilitation treatment. The Department of Rehabilitation Medicine of the Ninth Hospital has developed a set of effective rehabilitation treatment programs, including soft tissue release, joint release and SPS brace stretching. As a department featuring orthopedic rehabilitation, years of practice have allowed them to accumulate a wealth of experience in dealing with joint stiffness. For joint stiffness simple rough pressure, breaking is not desirable, because such a method not only can not solve the whole problem will also bring new injuries and complications such as heterotopic ossification, or even cause fractures such serious consequences, causing the joint function to snowball. Therefore, it is recommended that patients go to rehabilitation medicine to receive more specialized rehabilitation treatment, especially arthroplasty. Of course, nowadays, the rehabilitation medicine departments are mainly focused on neurological rehabilitation (stroke hemiplegia), so patients should still choose a specialized rehabilitation featuring orthopedic rehabilitation. For patients in advanced stages, rehabilitation doctors either refer them directly to orthopedics for minimally invasive release surgery and follow up rehabilitation in a timely manner after surgery (many patients often obtain unexpected results after such systematic treatment), or decide whether to operate after a period of rehabilitation treatment based on the response to the efficacy. The Department of Orthopaedics and the Department of Rehabilitation of the Ninth Hospital have joined forces in the prevention and treatment of joint stiffness, bringing a boon to patients with orthopaedic injuries. Perioperative rehabilitation plays a vital role in the prevention of joint stiffness; it greatly reduces the disability rate of bone and joint diseases. The conservative rehabilitation of joint stiffness and the combination of rehabilitation after minimally invasive release surgery have brought hope to those patients who have already caused functional impairment.