1, lead to knee joint pain: knee arthritis in the early stage can be manifested as pain when the activity, a long time walking, physical labor, up and down the building, squat up and down when the pain is obvious, rest can reduce the pain symptoms. Wait until the disease develops to a certain degree, may come out of the ground pain, even when the rest of the pain. This severely restricts the normal life and labor of patients and affects the quality of life of patients.

2. Knee joint deformity: in the middle and late stages of knee joint lesions, the bone, line of force, joint space and surrounding soft tissues of the joint have undergone structural changes due to the long-term pathological process. Common knee joint deformity include knee flexion contracture, inversion deformity, knee joint subluxation, etc. At this point, the knee joint has partially or completely lost the function of movement, and joint deformity directly affects the appearance and gait.

3. Restricted knee joint activity: in the early stage, due to knee joint pain, patients dare not move or are unwilling to move, so the knee joint will be in a state of "idle" for a long time; With the progress of the disease, the soft tissues around the joints are bonded and contracture. The patient suffers severe pain and cannot move normally. What is more, the knee joint is fixed in a certain position for a long time, resulting in joint stiffness, until joint bone fusion.