[quote=@Kho]
here's hoping that modern medicine leaps forward soon and makes fixing knee cartilage and ligament damage possible
[/quote]

Some doctors actually use plasma in order to heal bones and ligaments back to their original state. Problem is, it's expensive as all hell and only reserved for people who have absolutely torn their meniscus or stuff like that xD 

So basically pro MMA fighters and that one rich dude who tried to ride an ATV backwards and had it flip over.