Details Osteochondritis dissecans is a disorder that can affect the talus bone of the ankle or other bones such as the femur in the knee and the capitellum in the elbow. It is not completely understood but it can have a profound effect on joint function if it is severe. Usually a flap of surface cartilage breaks down because it is not supported by the underlying bone in this disorder. If osteochondritis is not treated early, arthritis and significant pain can occur. Causes The cause of osteochondritis dissecans of the talus is controversial.
Some physicians believe it is the result of an injury or trauma to the ankle.
Others contend that the cause is poor blood supply to the bone and that the disorder can occur without any injury. The diagnosis of osteochondritis dissecans of the talus is made by a history of pain around the ankle that is sometimes associated with clicking or catching. It can be a dull toothache like pain or a sharp stabbing pain. The patient may or may not describe a history of an injury to the ankle. X-rays are used to initially evaluate the talus bone of the ankle.