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Unhappy Triad of the Knee. The unhappy triad is a severe injury which involves damage to three of the four major ligaments in the knee. The unhappy triad, also known as the terrible triad, or o'donoghues triad is a severe knee injury.
MCL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.The most obvious sypmtom of MCL injury is pain. Following the injury, you will experience pain in the knee, usually along the iside of the joint.CL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.