Knee flexion limitation can be treated by flexion functional exercise and ligament release in the early stage, and if the flexion limitation caused by osteoarthritis in the late stage, it needs surgical treatment. 1. Early treatment: Early treatment is mainly through functional exercises to improve, such as knee trauma or surgery caused by bending disorder, mainly due to insufficient functional exercises of the knee joint leading to bending limitation. Therefore, according to the bending restriction situation, under the guidance of the doctor, functional exercises can be carried out to restore the mobility of the knee joint. If the functional exercise still can’t improve, we can consider knee ligament release surgery under local anesthesia or general anesthesia. 2. Late treatment: such as osteoarthritis of the knee, rheumatoid arthritis, traumatic arthritis, osteoarthritis and other diseases in the late stage of the joints due to severe degeneration of the knee joint bending limitation, at this time, generally have to carry out knee replacement, in order to restore the function of the knee joint extension and flexion. Restricted knee bending requires hospitalization and appropriate treatment.