Gait and balance of transfemoral amputees using passive mechanical and microprocessor-controlled prosthetic knees

K. R. Kaufman, J. A. Levine, R. H. Brey, B. K. Iverson, S. K. McCrady, D. J. Padgett, M. J. Joyner

Research output: Contribution to journalArticlepeer-review

116 Scopus citations

Abstract

Background: Microprocessor-controlled knee joints appeared on the market a decade ago. These joints are more sophisticated and more expensive than mechanical ones. The literature is contradictory regarding changes in gait and balance when using these sophisticated devices. Methods: This study employed a crossover design to assess the comparative performance of a passive mechanical knee prosthesis compared to a microprocessor-controlled knee joint in 15 subjects with an above-knee amputation. Objective measurements of gait and balance were obtained. Results: Subjects demonstrated significantly improved gait characteristics after receiving the microprocessor-controlled prosthetic knee joint (p < 0.01). Improvements in gait were a transition from a hyperextended knee to a flexed knee during loading response which resulted in a change from an internal knee flexor moment to a knee extensor moment. The participants' balance also improved (p < 0.01). All conditions of the Sensory Organization Test (SOT) demonstrated improvements in equilibrium score. The composite score also increased. Conclusions: Transfemoral amputees using a microprocessor-controlled knee have significant improvements in gait and balance.

Original languageEnglish (US)
Pages (from-to)489-493
Number of pages5
JournalGait and Posture
Volume26
Issue number4
DOIs
StatePublished - Oct 1 2007

Keywords

  • Amputees
  • Gait
  • Leg prosthesis
  • Postural balance

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

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