[Dorsomedial talocalcaneal coalition: a rare condition].

Talocalcaneal coalitions are rare but a posterior facet talocalcaneal coalition is even rarer. There are three different types: fibrous, cartilaginous and osseous coalitions. Besides conventional x-rays computed tomography is essential for assessment of the subtarsal joint. In the absence of concomitant coalitions and foot deformity resection of the coalition is advocated due to good clinical results when there is an adequate size of the talocalcaneal joint (>50%) and without osteoarthrosis. A case of a rare posterior facet talocalcaneal coalition is reported.