Ribbing disease is a rare disease that causes bony growths to develop on the long bones. These bony growths most commonly affect the long bones of the lower legs, such as the thigh bone (femur) and shin bone (tibia) but can also affect the long bones of the arms. Symptoms of the disease may include pain and muscle weakness in the areas where the bone growths are occurring. The bone growths typically occur only on one side of the body or in different bones on both sides of the body. Ribbing disease has similar signs and symptoms to another disease called Camurati-Engelmann disease (CED). However, symptoms of CED typically begin at a younger age and may affect more bones on both sides of the body than Ribbing disease does. The exact cause of Ribbing disease is currently unknown. Diagnosis of Ribbing disease is based on observing symptoms of the disease such as bone pain, especially in the bones of the legs. The diagnosis may be confirmed by imaging procedures