Symptoms of excessive wear and tear of the knee joint mainly include pain, swelling, and limitation of activities. 1. Pain: Early excessive wear and tear of the knee joint is usually characterized by intermittent pain, such as pain when going up and down stairs or climbing mountains, which can be relieved after rest. With the further aggravation of wear and tear, the pain symptoms persist and even night pain occurs. 2. Swelling: When the knee joint is excessively worn, the ligaments and tendons in the joint will become edematous and increase in exudation, while the synovial membrane will proliferate, resulting in fluid accumulation in the joint and swelling of the joint. 3. Restriction of activities: after the knee is worn out, there will be cartilage destruction, bone cumbersome, synovial membrane hyperplasia, etc., resulting in narrowing of the joint space in the knee joint, contracture of tendons, ligaments and other soft tissues, which will result in the restriction of knee flexion and extension functions and decrease of joint activities. If the patient has the above symptoms, it is recommended to go to the hospital in time for early and regular treatment.