You could say the same about Brock Lesnar, the only difference is that HHH always gets injured work-wise with quad tears, bloor clots and what not. And Brock, well, fucked up shit, just always seems to happen to him (broken rib, botched SSP, car accident, boat accident).
Hell, HHH would probably have it surgergically (sp?) placed back on and would still want to get back into the ring. And if this was a Marvel-like realm, Trips's probably grow his leg back out like he was a lizard or a starfish or some shit.