it's still probably due to basketball, where ACL tears are one of the most common injuries (after ankle sprains of course). many tendon and ligaments can't easi

it's still probably due to basketball, where ACL tears are one of the most common injuries (after ankle sprains of course). many tendon and ligaments can't easily repair themselves (and where they can, it's slow), so the tears accumulate over time. the ACL is absolutely crucial (ha!) to stabilizing the knee (especially front-back motion on the horizontal plane) and keeping it from falling apart (hyperextending along the tibiofemoral axis). (took a dissection class in grad school, where we cut an ACL to see how it affects motion and stability.)