The metatarsal bone rattling three times down the stairs is not necessarily a fracture, it may be due to physiological rattling, or it may be due to arthritis and joint free body and other reasons. 1. Physiological rattling: Generally, when you are moving, the two cartilages rub against each other or the cartilage rubs against the joint capsule, which will lead to rattling, which is a normal physiological phenomenon. 2. Arthritis: Rattling may be caused by arthritis. Usually, if there is inflammation within the joint, localized adhesion may occur, thus the internal cartilage friction, resulting in the symptom of rattling when moving. 3. Joint free body: If the patient has a history of fracture, there may be small fragments of bone remaining in the joint cavity after the fracture, and the small fragments of bone will collide with each other when moving, which will lead to rattling. In addition to the above reasons, musculoskeletal inflammation may also be a cause of rattling. If the metatarsal bone rattles three times down the stairs and you are not sure of the cause, you should go to the hospital in time to get a clear picture of the disease and follow the doctor’s instructions.