Is it possible to regain muscle tone on back hip &thigh after thr for avn (2011) if so, what exercises.incision - 6" on side, dents in, rt back droops?

Absolutely : yes, absolutely you should be able to regain muscle tone. You need to work on core strengthening of the abdominal hip flexors and Buttock muscles. need to work on muscle group called the abductor muscles. The exercises specific for the abductor muscles would've been taught to you in rehab. These would be the exercises that include scissoring your operative leg away from midline, use ankle weights