Energy-efficient knee-ankle-foot orthosis: A case study

Kenton R. Kaufman, S. E. Irby, J. W. Mathewson, B. W. Wirta, D. H. Sutherland

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


The energy required to walk using a newly designed knee-ankle-foot orthosis (KAFO) has been evaluated. The new KAFO locks the knee during stance and allows free-knee motion during the swing phase of gait. The energy required for gait on level ground and on a slope with a 5-percent incline was evaluated in a postpolio subject. Comparisons were made between the standard locked-knee KAFO and the free-knee (unlocked) configuration. The oxygen consumption rate (ml/kg/ min) and energy cost (ml/kg/m) were significantly lower during free-knee gait. The results of the study show that a KAFO design that allows free-knee motion during swing is effective in lowering the energy required for walking.

Original languageEnglish (US)
Pages (from-to)79-85
Number of pages7
JournalJournal of Prosthetics and Orthotics
Issue number3
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Biomedical Engineering
  • Orthopedics and Sports Medicine
  • Rehabilitation


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