1. Harborview Medical Center, The Prosthetics Research Study, and the Seattle VA Medical Center, Seattle, Washington.
2. Assistant Professor of Orthopaedic Surgery, University of Washington, 325 Ninth Ave, ZA-48, Seattle, Washington 98102.
3. Associate Professor of Orthopaedic Surgery, University of Washington.
4. Professor of Orthopaedic Surgery, University of Washington.
5. Clinical Professor of Orthopaedic Surgery, University of Washington, and Principal Investigator of the Prosthetics Research Study.