I meant it like it's not a tear ligament. That's why I said or somewhat minor knee injury. That's what I think of when I hear the word "a sprained knee or knee sprain". Torn ACL/PCL/MCL of any kind (whether it's a small tear or totally torn) is usually a major injury. MCL or PCL isn't as bad as ACL. It's like you're arguing that "car accident" and "destroyed engine compartment" are mutually exclusive. Knee sprains cause, among other things, ACL tears.