What is ankle arthritis? Ankle arthritis develops when the ankle joint looses cartilage. The ankle joint space narrows with worsening pain and loss of range of motion.  What causes ankle arthritis? Most common cause of ankle is post-traumatic arthritis and other causes are primary osteoarthritis, rheumatoid arthritis, osteonecrosis, septic joint, gout, and hemophilia.  What are the signs of ankle arthritis? …