Treatment options for a twelve year old boy who has suffered an injury to the subtalar navicular bone include conservative treatment, surgery, and more. Injury or even displacement of the paravalvular bone of the foot is not uncommon in clinical practice. The paravalvular bone is a congenital variant of the second ossification center of the navicular tuberosity. According to statistics, about 14% of normal people have this variant. Late diagnosis of this disease is easier, early due to acute ankle sprain, often covered by the lateral ankle ligament injury, and in the ligament symptoms to reduce or disappear only to find that there has been damage to the paravalvular bone. Acute patients may have pain, swelling, subcutaneous bruising and worsening of symptoms when walking, etc. X-ray presentation: the paravalvular bone is triangular or rounded. In the acute stage, patients should rest in bed, local medication and fixation with plaster cast, and rest for 2 to 4 weeks. When conservative treatment is ineffective, surgery is feasible to remove the displaced or necrotic degeneration, cystic degeneration of the paravalvular bone.