Bone marrow edema is not synovitis. Bone marrow edema is the bone marrow area due to traumatic arthritis or osteoarthritis and other stimuli and edema, usually can not see, can not feel, mainly for magnetic resonance imaging to see the bone marrow at the edema-like changes. Generally need sufficient rest, reduce the amount of exercise, hot compresses, promote local blood circulation to reduce edema. Synovitis is trauma, obesity, overwork and other stimulation of the synovial membrane so that the synovial membrane inflammatory changes. Generally also need to rest, reduce the activities of the joint parts; but not hot compresses, hot compresses will aggravate congestion, edema, and make synovitis aggravated. Joint lesions should be timely to the regular hospital, the doctor according to the symptoms, signs and auxiliary examination to determine the specific cause of the disease, to give the correct treatment for the cause of the disease.