The possible reasons for the growth of an extra bone at the broken end of the right ankle bone after healing include malunion of fracture, osteophyte, bone cyst, etc. 1. Malunion of fracture: If displacement occurs during the healing process of right ankle bone, malunion of fracture will be formed, and the phenomenon of growing a bone at the broken end may occur. 2. Osteomalacia: the fracture of the right ankle bone may cause joint degeneration and osteomalacia, and there is hyperplasia in the fracture site, which manifests as bony prominence, and the local pressure is a hard lump, and there is the phenomenon that the fracture site of the right ankle bone grows a bone after the fracture is healed. 3. Bone cyst: the right ankle bone may be traumatized, bleeding after the formation of traumatic hematoma, local resorption of ossification, resulting in the occurrence of bone cysts, appearing after the healing of the right ankle bone at the broken end of the site of the phenomenon of growing a bone. The right ankle bone healing broken end part of the long a bone may also have other reasons, it is recommended to go to the regular hospital in a timely manner, improve the relevant examination, clear cause, under the guidance of the doctor for targeted treatment or treatment.