Peroneal dislocation can occur following an ankle injury and often occurs as a result of forceful passive dorsiflexion (which means foot and toes up towards the shin). This situation results in the tendons tearing away from the supporting sheath on the side of the ankle near the lateral malleolus (lateral ankle bone). The tendons often relocate but can be dislocated again during passive plantarflexion (toes and foot pointed). This situation results in a need for surgical repair of the supporting sheath.