O'Donoghue's 1950 classic describes the knee injury from abduction and external rotation of the tibia — the 'unhappy triad' of MCL, medial meniscus, and ACL damage. It lays out how to diagnose these injuries at the moment they occur and argues for early surgical repair of all damaged structures.
This is the paper that named the injury you will be asked about on the OITE: the O'Donoghue unhappy triad of MCL, medial meniscus, and ACL from a valgus and external rotation force. The enduring clinical lesson is the exam, not the operation. O'Donoghue insisted the best time to diagnose a knee ligament injury is at the moment it happens, before muscle spasm and hemarthrosis mask instability.
Learn his four early signs: lateral instability, focal tenderness, a positive drawer, and early loss of extension pointing to meniscal damage. The anatomic pearl still tested today is that the deep MCL layer carries the meniscal attachment, which is why deep tears displace the meniscus and why these injuries travel together.
Modern practice has moved away from acute repair of all structures toward reconstruction and selective meniscal preservation, so read his surgical algorithm as historical context rather than current technique.
O'Donoghue's 1950 classic describes the knee injury from abduction and external rotation of the tibia — the 'unhappy triad' of MCL, medial meniscus, and ACL damage. It lays out how to diagnose these injuries at the moment they occur and argues for early surgical repair of all damaged structures.
This is the paper that named the injury you will be asked about on the OITE: the O'Donoghue unhappy triad of MCL, medial meniscus, and ACL from a valgus and external rotation force. The enduring clinical lesson is the exam, not the operation. O'Donoghue insisted the best time to diagnose a knee ligament injury is at the moment it happens, before muscle spasm and hemarthrosis mask instability.
Learn his four early signs: lateral instability, focal tenderness, a positive drawer, and early loss of extension pointing to meniscal damage. The anatomic pearl still tested today is that the deep MCL layer carries the meniscal attachment, which is why deep tears displace the meniscus and why these injuries travel together.
Modern practice has moved away from acute repair of all structures toward reconstruction and selective meniscal preservation, so read his surgical algorithm as historical context rather than current technique.