Case history
Case history
A 21-year-old rugby player was tackled on the lateral side of his left lower thigh. During the course of the tackle, the player felt a tearing sensation on the medial part of his knee that was associated with excruciating pain. Immediately after the play, he was unable to get up or walk. On physical examination, there is significant tenderness of the adductor tubercle and joint line. Valgus stress testing (abduction stress test) demonstrates some medial instability at 30 degrees of knee flexion, but with a firm endpoint (i.e., resistance is felt). Anterior drawer test and Lachman's test are negative.[Figure caption and citation for the preceding image starts]: The abduction (valgus) stress testFrom the collection of Sanjeev Bhatia, MD; used with permission [Citation ends].
[Figure caption and citation for the preceding image starts]: The anterior drawer testFrom the collection of Sanjeev Bhatia, MD; used with permission [Citation ends].
[Figure caption and citation for the preceding image starts]: The Lachman's testFrom the collection of Sanjeev Bhatia, MD; used with permission [Citation ends].
Other presentations
Although rare, it is possible for a patient who has had an acute MCL injury to develop chronic valgus (twisting outwards away from the mid-line) instability. Chronic MCL injury is usually defined as symptoms that persist for 3 months or longer after injury.[4] By this point, injured ligament tissue is beyond its capacity to heal, and anatomical restoration is usually no longer possible due to scar tissue formation and contractures of ligament ends. When combined with anterior cruciate ligament deficiency, chronic MCL injury has been shown to seriously compromise joint stability, and these patients frequently experience symptoms of their knees giving way.[5][6][7]
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