You will be asked to sit in a chair, stand, walk about 10 feet, turn around, return to the chair, and sit down. During another test, you will be asked to walk a certain distance (about 30 feet) while a physical therapist watches your steps. You will be asked to walk around the room in certain ways, and step over lines on the floor. You will also fill out a survey about your physical and emotional health as well as your pain. At the end of the study, you will be asked to fill out another questionnaire regarding the study. Both the physical tests and the surveys should take about 15 minutes to complete. In addition, at the end of the study, you will be asked to fill out a questionnaire about the study.