Posttraumatic cavovarus deformity of the foot

The peroneus longus has long been known as a plantar flexor of the first ray, 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 inactivity as an everter of the foot. This substantiates the need for primary repair of this major tendon as well as raises interesting biomechanical issues in foot mechanics.