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An unhappy triad (or terrible triad, or O'Donoghue's triad) is an injury to the knee. It commonly occurs in contact sports (such as American football). The mechanism for this injury occurs when a lateral (outside) force to the knee is received while the foot is fixed on the ground.
Structures in triad
This scenario causes an injury to three knee structures:
The inclusion of the medial meniscus in the triad has been challenged.
The reason that the medial collateral ligament and medial meniscus are injured together is because they are attached to one another in the knee joint.
The term "unhappy triad" was coined by O'Donoghue in 1950. However, since then the terms "unhappy triad" and "terrible triad" have also been used to describe several other combinations of joint injuries, including those of the elbow and shoulder.
The term "terrible triad" is also sometimes used in the popular press to describe conditions relating to pain, or even to refer to the MacDonald triad.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Unhappy_triad". A list of authors is available in Wikipedia.|