since she is a potential client at this point in time, I would educate myself about the different types of hip replacements so that you will know what questions to ask. As you could see from the answers above, there are different options. If I was a potential client, I would be impressed with a trainer who knows the differences. With double hip and knee replacements, you’ll need a physician’s okay in any case. I would then ask the client to bring copies of all the PT exercises she ever got.