Patients with knee synovitis are often accompanied by osteoarthritis, so most of the knee rustling in synovitis is caused by strenuous exercise, osteophytes, joint cavity effusion and other reasons. 1. Excessive exercise: due to excessive exercise to make the cartilage wear and tear, the soft bone surface of the knee joint is not flat, when walking or flexing and extending the knee joint, it will produce a friction rustling sound. 2. Osteophytes: Due to some acute and chronic injuries, long-term stimulation leads to the formation of osteophytes in the knee joint, which may rub against each other when flexing and extending the knee joint, resulting in a rustling sound when walking. 3. Joint cavity effusion: synovial membrane due to pathological reasons lead to synovial membrane swelling, oozing, produce effusion, in the knee joint flexion and extension activities after the friction and impact will produce a seizure sound. Synovitis knee rustling symptoms, it is recommended that patients go to the hospital in a timely manner, in accordance with the doctor’s instructions for standardized treatment, to avoid delaying the condition.