Chipped bone or Osteochondritis dissecans (OCD) is a problem that causes pain and stiffness of the ankle joint.Most cases of OCD usually follow a twisting injury to the ankle and are actually fractures of the joint surface
The cause of most cases of OCD are thought to be actual chip-type fractures. These fractures occur with severe ankle sprains.
Nonsurgical treatment includes immobilization in a cast for six weeks to see if the bone injury heals. If your pain is fine then healing process is good,still if you feel the pain then you should see a orthopedic surgeon.