@aastha0993 My nephew had this in both hips, and had successful replacements two years apart.
Here is what I know, both from being a hip patient myself, and from his experiences. First, not every orthopedic surgeon handles these cases, so you will need to find one who does. Mayo would definitely be a good place to start your search.
Second, complex surgeries often require the posterior approach, as they give the surgeon a better field of view when determining how much bone is affected, and in putting the stem into the femur.
Finally, I know many believe the anterior approach is "better" but each method has its own place in the world of orthopedics.
Have you contacted Mayo yet to get an appointment? Here is a link you can use:
http://mayocl.in/1mtmR63
Sue