Glad he is doing better. I think my great grandmother is high 70's to low 80's and she destroyed her hip in a fall. The doctor said most people in the same situation never walk again. Well, now she waves her cane around in the air as she is walking and says, "This here is my walking stick. I need it to walk" as she is walking around the room. I hope that your father can make a good recovery as my grandmother did.