An unusual presentation of acute isolated spring ligament injury in an adolescent: A case report.

Spring ligament is an important stabilizing soft tissue structure on the plantar aspect of calcaneo-navicular joint. It is principal stabilizing structure to maintain the medial longitudinal arch during weight bearing. Attenuation of spring ligament along with tibialis posterior tendon deficiency usually results in adult acquired flat foot. However, cases of isolated injury to spring ligament are rare in the literature. A case of neglected spring ligament injury in a 15 years old girl with an unusual and dramatic presentation is described. Head of talus used to dislocate medially and plantarwards on every step of walking. This was treated successfully with talonavicular fusion. Level of clinical evidence: Level IV.