DR. K. msk cases

Calcaneonavicular Coalition

Coalition (tarsal) is an abnormal bony, cartilaginous, or fibrous union between two or more bones (hind- and midfoot). It is a fairly common condition, generally estimated to affect up to 1% of the population. Talocalcaneal and calcaneonavicular coalitions account for approximately 90% of the cases of tarsal coalition. Calcaneonavicular coalition occurs in between the anterolateral process of the calcaneus and dorsolateral margin of the navicular bone. In patients with fibrous and cartilaginous coalitions, irregularity and narrowing of bone interfaces may occur in addition to sclerosis and eburnation. A solid bony bar forms a bridge if an osseous coalition is present. Calcaneonavicular coalition is viewed best on a 45° internal oblique radiograph.

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