Patient: Since 1995, severe stabbing pains occurred when riding a bicycle with a little force. X-rays and Tibetan plasters were taken, but to no avail. The condition has been deteriorating year by year. The doctor diagnosed that the joint was aging. Ge Jinghua, Department of Orthopedics, Shanghai Longhua Hospital: According to the symptoms you described, the disease you are suffering from should belong to osteoarthritis, which is a sterile inflammation of joints caused by degeneration of joint cartilage. The disease starts in middle age and worsens progressively until the joint space is narrowed and walking is difficult. The disease can be treated early with medications, including oral and topical medications, intra-articular injections, etc. When the joint cavity is severely degenerated, the joint space is narrowed, and the knee joint is deformed in flexion and inversion, surgery is indicated.