Posttraumatic cavovarus deformity of the foot

The peroneus longus has long been known as a plantar flexor of the first ra y, which, with muscle imbalance as seen in neurovascular disease, can lead to cavovarus of the foot. This article describes a traumatic laceration of the peroneus brevis that went on to cause cavovarus presumably by its inact ivity as an everter of the foot. This substantiates the need for primary re pair of this major tendon as well as raises interesting biomechanical issue s in foot mechanics.