What to do with a shattered elbow with damaged cartilage on a 20 year old?

I was in a terrible car accident on August 20, 2009, which left me with both elbows fractured/shattered. My right elbow is currently fused at a 90degree angle due to excessive bone growing around the elbow; but the main problem is that the cartilage is destroyed and there is no surface for any type of movement. Since I am only 20, my doctor does not recommend a elbow replacement, because it will be worn out quickly; and there is a weight limitation of 20lbs max. Is there any type of surgery that can replace cartilage? I know the injury is really bad and I am not hoping for total recovery for this elbow, but I would love to have some range of motion.