The purpose of the study is to explore the long term functional status of people who have had both a spinal fusion procedure and a total hip replacement. Studies have found that those who have received spinal fusion may have worse outcomes following a total hip replacement than those who have not received a spinal fusion. The information obtained from this study will allow surgeons and researchers to better understand why some who've had a spine fusion have more complications post total hip replacement compared to those who did not have spinal fusion surgery.