Hey Paula,
I have had slipped capital femoral epiphysis too on both hip. Left when I was 11 and right when I was 13. I had only one option though. My ortho said he can't do the resurfacing because with the slipped capital femoral epiphysis it has left my neck and head deformed. He told me that he would not recommend resurfacing because of this issue. He told me they only way to correct my hip is with a THR. My right leg is really turned out. I can almost turn my feet totally backwards. He said if he did the resurfacing it will dislocate and that would mean that I would have to have the THR instead. I really didn't get alot of opinions because this totally makes since to me. The resurfacing is just going to help with the arthritis pain and not going to correct the anatomy of the hip. I really don't have a length issue because both of my hips went with the slipped capital femoral epiphysis. If it is, it is un-noticible. I am scared to go through all of this but I can't stand the pain anymore.