[1] VA Puget Sound Hlth Care Syst, Dept Vet Affairs, RR&D Ctr Excellence Limb Loss Prevent & Prosthet, Seattle, WA USA
[2] Univ Washington, Dept Mech Engn, Seattle, WA 98195 USA
[3] Univ Washington, Dept Radiol, Seattle, WA 98195 USA
[4] Univ Washington, Dept Orthopaed & Sports Med, Seattle, WA 98195 USA