The common causes of ankle joint rattling after a broken foot are ligament rupture, fracture, degenerative osteoarthritis and so on. 1. Ligament rupture: Ankle sprain after breaking the foot may cause ligament rupture and soft tissue damage, at this time there is a rattling sound. 2. Fracture: after breaking the foot, if the bone is more serious, it will cause fracture and rattle in the ankle joint. 3. Degenerative osteoarthritis: Trauma can lead to degenerative osteoarthritis in the ankle, which makes the ankle joint rattle when it is flexed or extended. There may be other reasons for the rattling of the ankle joint after breaking the ankle, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.