👉 Navicularia is a rare, inherited bone disorder characterized by an abnormal growth pattern in the bones of the lower leg and foot. It affects about 1 in every 200,000 people worldwide and can present with symptoms such as pain, swelling, or deformities. The exact cause of navicularia remains unknown but is thought to be associated with a genetic mutation affecting the protein called cartilage glycoprotein IIB (CIGIIB) in the bone cells that