The indication for joint replacement surgery is when you can no longer live with the pain. If non-surgical treatment options such as anti-inflammatory medication, injections and physical therapy are no longer effective, then hip replacement surgery is likely indicated. . The technology for hip replacement implants has advanced considerably, meaning there is a lower risk that a hip revision surgery would be necessary down the road.
Less invasive approaches, including an anterior approach, seem to decrease the risk of post-operative hip dislocations and allow for more rapid rehabilitation and less post-operative pain. However, the most important consideration during surgery is proper visualization to make certain the components are put in as perfect a position as possible, which will aid in longevity of the prosthesis. In some patients this may require a larger incision or more invasive approach. Some orthopedic surgeons are using a robotic approach, which is less invasive and offers more precise hip positioning. However, studies are still being done to determine if this advantage is more theoretical or truly a better approach.
I recommend you return to your orthopedic surgeon to determine what type of prosthesis and what operative approach is best for you. If you are still unsure, you may want to seek a second orthopedic opinion from an additional orthopedic hip specialist.