I have seen it to bro ,was at the gym one day ,one of the biggest guys in our gym tore his knee out of place on the squat rack ,dont rember the exact weight but it was way up there ,didnt have his knee wraped but had torn it out twice in col,
we all came running over there and was a sick site his schin was almost touching his hip !!!!!!!!!!! one of the guys even threw up,peeps need to think before they lift .