A test used to determine stability of the distal tibiofibular syndesmosis and rotatory instability of the ankle mortise. With the patient sitting with the knee flexed over the table’s edge, the examiner stabilizes the patient’s lower leg, slightly dorsiflexes the ankle, and externally rotates the foot. Pain along the lateral ankle indicates a sprain of the distal tibiofibular syndesmosis. Medial ankle pain or a palpable subluxation of the talus within the ankle mortise is indicative of ankle rotatory instability.