- See: Operative Treatment of Posterior Malleolar Fractures
- involves frxs of medial malleolus & fibula, along w/ frx of posterior lip of articular surface of tibia is frxed & displaced, allowing posterior & lateral displacement and external rotation w/ supination of the foot;
- medial malleolus may remain intact with a tear of the deltoid ligament occuring instead of malleolar fracture;
- same indications for ORIF apply to trimalleolar fx as bimalleolar frx;
Instability of the distal tibiofibular syndesmosis after bimalleolar and trimalleolar ankle fractures.