Unhappy Triad of O'Donoghue
The unhappy triad (O'Donoghue triad) is a combined knee injury involving the ACL, MCL, and medial meniscus, classically caused by a valgus contact force on a planted foot. Modern evidence has revised the original description — the lateral meniscus is now recognised as the more commonly injured meniscus in this injury pattern.
Practised by MCQ
10Which of the following structures is NOT typically involved in the unhappy triad injury?
mcqWhat is the classic mechanism of injury for the unhappy triad?
mcqWhich demographic is most commonly affected by the unhappy triad?
mcqIn acute combined injuries of the ACL and MCL, which meniscus is more likely to be injured?
mcqWhat type of injury is the 'clip' injury commonly associated with?
mcqWhich ligament is the first to fail in the classical mechanism of the unhappy triad?
mcqWhich of the following sports is most commonly associated with the unhappy triad?
mcqWhat role does the medial meniscus play in chronic ACL-deficient knees?
mcqWhat is the consequence of a valgus force combined with external rotation on the knee?
mcqWhat is the significance of the 'snow-plow' injury in skiing?