True, often a valgus hyperextension non contact injury and if you feel a pop, a large effusion (knee fills up with
blood) within 6 hours And you can’t continue playing with that history 80% will have torn their ACL. And a good initial exam is better than an MRI to assess if the ACL is torn completely and is unstable or not. MRI Is obviously better to determine where and how extensive the collaterals are torn—MCL and LCL The meniscus, and the cartilage