Mr. Wang was involved in a car accident three years ago and fractured his knee. At that time, the doctor gave him a plate fixation. One year later, the fracture healed, but there was pain when walking and a “clacking” sound when extending and flexing. At first, he thought the plate was the reason. However, after the plate was removed, the pain did not ease when walking and increased when walking up and down stairs, especially when it rained, when the weather became cold and humid, and when the air conditioner was blowing, the pain became more obvious and painful. When he came to the hospital, the doctor recommended that he have an MRI, which revealed meniscal damage and wear and tear of the articular cartilage. After arthroscopic surgery, the pain was significantly better. Arthritis caused by traumatic fractures is common, and tends to occur in intra-articular fractures. Examples include knee, ankle, shoulder, elbow and wrist joints. After the fracture is repositioned, plaster or plate screw fixation is performed. Even if the X-rays show a good fracture and healing, it does not mean that the joint function will be fully restored. Bone injury is accompanied by damage to cartilage, meniscus, synovium, ligaments, and fascia, which cannot be shown on X-rays; the healing time is also very long, and some cannot be repaired. If not treated properly, it can affect the function and accelerate the development of arthritis. If you still have pain after more than three months of functional joint activity after the fracture has healed, you can have an X-ray radiograph and MRI. If meniscal damage is found, arthroscopic surgery can be performed; if asymmetry of the joint gap is found, the walking posture should be corrected, and in severe cases, surgical osteotomy should be performed to correct the problem. For older patients with severe cartilage wear and joint space narrowing, joint replacement is required. Patients usually need to keep warm. For severe periarthritis, the shoulder can be closed. Intra-articular injection of artificial joint fluid can also be used to increase the lubrication of the joint, slowing down the process of joint degeneration and delaying joint replacement. Patients can use anti-inflammatory and analgesic drugs that are less irritating to the gastrointestinal tract to relieve pain. Chinese herbal fumigation can also be used. At the same time, muscle exercises of the limbs are performed to build muscle strength. Therefore, comprehensive treatment and rehabilitation exercises are needed for arthritis caused by fracture.