Unhappy Triad

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The "Unhappy Triad" is an injury to the knee. The unhappy triad injury 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. This scenario causes an injury to three knee structures: the anterior cruciate ligament, medial collateral ligament, and the medial meniscus. 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.

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