I guess Payne did have his ligament replaced, but cartiledge is a different thing. As I said I'm not sure that anyone who's had teh cadaver cartiledge put in their leg has recovered enough to play again. (ex cartiledge is the spongy substance between your bones at the joints) The ligament replacement is pretty prevalent I believe. Whereas the cartiledge replacement is a little more rare, and I think its a 'last option' type of procedure. With all this ligament and cartiledge talk I can't help but ask 'Is there a Doctor in the house?'