The symptoms of osteochondritis of the knee joint include the following: 1. Knee joint pain. The main manifestation is pain during activity, which can be reduced when resting and is sore, and will be more obvious when cold, and can be significantly reduced after local heat. 2. knee edema. After synovitis of the knee joint, due to the existence of aseptic inflammation, resulting in local inflammatory reaction, will lead to knee joint effusion edema, edema can be obvious floating patella test positive. 3, local skin temperature increase. Due to the presence of aseptic inflammation, the metabolism will be strengthened and the skin temperature of the knee joint will be significantly increased. 4. Restriction of knee extension and flexion. When the inflammation is obvious and edema, the knee joint extension and flexion activities will be affected by the pain, and the activities will aggravate the pain caused by the compression of the synovial membrane, so it will affect the normal activities.