The medial collateral ligament, while not heard about as much as the ACL, has an injury incidence of 24 per 100,000 in athletes.
Occurrence of MCL injury is most common in those ages 16-19 with males having a higher incidence of injury (7.3 per 1,000 exposures) than females (5.6 per 1,000 exposures).
Most do not know that injury to the ACL can be accompanied by injury to the MCL (2 per 1,000 exposures).
Activities in which the most injuries occurred were skiing, football, soccer and ice hockey.
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Roach, C., Haley, C., Cameron, K., Pallis, M., Svoboda, S., & Owens, B. (2014). The Epidemiology of Medial Collateral Ligament Sprains in Young Athletes. The American Journal of Sports Medicine, 42(5), 1103–1109. doi:10.1177/0363546514524524
Silvis, M. (2014). Common Musculoskeletal Problems in the Ambulatory Setting, An Issue of Medical Clinics, E-Book (Vol. 98, No. 4). Elsevier Health Sciences.