Description: This is a rare disease that happens when there is a temporary or permanent loss of the blood supply to the Navicular (a bone above the inner arch of the foot). Without the blood supply the bone gradually dies (necrosis). It is noticeable when the child walks with a limp using the outside edge of the foot to prevent pain. Other symptoms are swellings and redness in the inner side of the ankle area.

Treatment: Orthoses can help alleviate pain while walking. If the disease has progressed, the foot must be immobilised in a plaster cast for some six weeks. Prognosis is very good.