“…There has been increased emphasis on the use of functional measures for outcome assessment, particularly in the area of medical rehabilitation (1)(2)(3)(4)(5). Because there are an estimated 300,000 elective total hip and knee arthroplasty procedures performed each year in the United States, the development of objective criteria that evaluate progress during rehabilitation would be extremely useful to the orthopedic surgeons, rheumatologists, physiatrists, physical therapists, occupational therapists, and nurses who care for these patients.…”