Associated talocalcaneal and calcaneonavicular coalitions in the same foot.

Tarsal coalition represents abnormal fusion among two or more tarsal bones and is a frequent cause of foot and ankle pain. The coexistence of calcaneonavicular and talocalcaneal coalitions in the same foot has been rarely cited in the literature. We report three cases of rigid flatfoot associated to a double coalition in the same foot. Routine computed tomography (CT) scan helped to delineate the joint space narrowing and bony bridges for preoperative planning. All cases were treated surgically with lateral and medial approach, bar resection, and extensor digitorum brevis interposition. Resection of such coalitions produced variable clinical and radiographic results. The authors discuss the frequency of multiple tarsal bars and the importance of CT in preoperative planning. Multiple tarsal coalitions in the same foot are probably not rare. Surgical outcomes can be jeopardized if they are not recognized in advance. The detection, localization, and characterization of this entity with routine CT scan are mandatory in patients undergoing surgery.IV.