Hey people there is a procedure out there thats called Arthrosurface Hemi-cap system. Depending on how severe the damage is they can now replace only the specific areas of damage. I had a 35mm implant on my patella and a 33mm implant on my femur right in the troclear groove. I am now two month post op and doing great. Full range of motion was around 18 days. The strength is coming around now. Full recovery is expected at six months.