title: Pilot testing of a variable stiffness transverse plane adapter for lower limb amputees.
abstract: Amputees often experience soft tissue breakdown and discomfort from the high transverse plane shear stresses between the residual limb and prosthesis. To evaluate the effects of varying the transverse plane stiffness, a small sample population of lower limb amputees wore a novel variable stiffness torsion adapter (VSTA). Peak transverse plane moments were evaluated for three fixed stiffness levels (compliant: 0.30Nm/°, intermediate: 0.57Nm/°, stiff: 0.91Nm/°) while participants traversed five tasks of daily living that emphasize transverse plane motion including: straight walking for reference, 90° turns, 180° turns, a static reach test, and the L-Test of functional mobility. Results indicated that activities requiring high levels of transverse plane motion (90° and 180° turns) had significantly reduced peak transverse plane moments when walking with the compliant transverse plane stiffness as compared to the stiff setting. Additionally, use of the VSTA resulted in no measurable loss of mobility at self-selected walking speeds between the three settings. These preliminary results indicate that a transverse rotation adapter with variable stiffness capability could be useful for a lower limb amputee to help reduce stresses at the socket-limb interface that result in soft tissue breakdown and discomfort.
authors.affiliation: Department of Veterans Affairs Center for Limb Loss Prevention and Prosthetic Engineering,1660 S. Columbian Way, Seattle, WA 98108, United States; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, United States. Electronic address: coreypew@u.washington.edu.
authors.forename: Corey
authors.initials: C
authors.lastname: Pew
authors.affiliation: Department of Veterans Affairs Center for Limb Loss Prevention and Prosthetic Engineering,1660 S. Columbian Way, Seattle, WA 98108, United States; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, United States. Electronic address: gklute@u.washington.edu.
authors.forename: Glenn K
authors.initials: GK
authors.lastname: Klute
mesh_terms: D000328:Adult; D000368:Aged; D000674:Amputees / Q000534:rehabilitation*; D001186:Artificial Limbs; D001696:Biomechanical Phenomena; D005684:Gait; D006801:Humans; D035002:Lower Extremity; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D016138:Walking
keywords: Amputee mobility; Lower limb amputee; Prosthesis; Torsion adapter; Turning gait; Variable stiffness