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Clin Biomech (Bristol, Avon). 2007 Jul;22(6):665-73. Epub 2007 Apr 2.

Kinetics of transfemoral amputees with osseointegrated fixation performing common activities of daily living.

Author information

  • 1School of Engineering Systems, Queensland University of Technology, Brisbane, Australia. wc.lee@qut.edu.au <wc.lee@qut.edu.au>

Abstract

BACKGROUND:

Direct anchorage of a lower-limb prosthesis to the bone through an implanted fixation (osseointegration) has been suggested as an excellent alternative for amputees experiencing complications from use of a conventional socket-type prosthesis. However, an attempt needs to be made to optimize the mechanical design of the fixation and refine the rehabilitation program. Understanding the load applied on the fixation is a crucial step towards this goal.

METHODS:

The load applied on the osseointegrated fixation of nine transfemoral amputees was measured using a load transducer, when the amputees performed activities which included straight-line level walking, ascending and descending stairs and a ramp as well as walking around a circle. Force and moment patterns along each gait cycle, magnitudes and time of occurrence of the local extrema of the load, as well as impulses were analysed.

FINDINGS:

Managing a ramp and stairs, and walking around a circle did not produce a significant increase (P>0.05) in load compared to straight-line level walking. The patterns of the moment about the medio-lateral axis were different among the six activities which may reflect the different strategies used in controlling the prosthetic knee joint.

INTERPRETATIONS:

This study increases the understanding of biomechanics of bone-anchored osseointegrated prostheses. The loading data provided will be useful in designing the osseointegrated fixation to increase the fatigue life and to refine the rehabilitation protocol.

PMID:
17400346
[PubMed - indexed for MEDLINE]
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