Tearing various tendons in my groin when I was around 16 was probably my worst injury. Thankfully, the only lasting effects of the injury is that my ligaments and the like will sometimes make audible popping sounds while moving in certain ways.

I have been under severe pain several times in my life, but in every situation, there was nothing broken, sprained, torn, or otherwise seriously injured. Incidents ranging from falling from two stories to jumping ten feet and having my shins land full-fledged against a metal bar or having 1.5 tons of freight land on my finger... and yet I have yet to have any lasting damage besides the pain...

My body, apparently, is strangely hardy.