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Unhappy Triad of the Knee
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Unhappy Triad of the Knee

Unhappy Triad of the Knee: Aka, O'Donoghue's triad of the knee joint.
  • Rupture of the tibial collateral ligament
  • Tearing of the ACL
  • Injury to the medial meniscus
Most commonly occurs during sports (football, rugby, etc.) when a lateral force is exerted on the knee of a fixed leg, with forced abduction and external rotation of the knee.
Image credits: Hellerhoff / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)

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