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.
Which of the following structures is NOT typically involved in the unhappy triad injury?
What is the classic mechanism of injury for the unhappy triad?
Which demographic is most commonly affected by the unhappy triad?
In acute combined injuries of the ACL and MCL, which meniscus is more likely to be injured?
What type of injury is the 'clip' injury commonly associated with?
Which ligament is the first to fail in the classical mechanism of the unhappy triad?
Which of the following sports is most commonly associated with the unhappy triad?
What role does the medial meniscus play in chronic ACL-deficient knees?
What is the consequence of a valgus force combined with external rotation on the knee?
What is the significance of the 'snow-plow' injury in skiing?
