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The Journal of Bone and Joint Surgery, Vol 70, Issue 7 1032-1037, Copyright © 1988 by Journal of Bone and Joint Surgery, Inc
Comparable energy expenditure after arthrodesis of the hip and ankle
RL Waters, G Barnes, T Husserl, L Silver and R Liss
Rancho Los Amigos Medical Center, Downey, California 90242.
The energy expenditure and gait characteristics of eleven subjects who had
a unilateral arthrodesis of the hip and ten subjects who had a unilateral
arthrodesis of the ankle were measured during a twenty-minute walking
trial. Oxygen consumption was determined and heart rate, respiratory rate,
and step frequency were monitored. The average walking speed for both
groups was sixty-seven meters per minute, which is 84 per cent of normal
gait velocity. After an arthrodesis of the ankle, the average rate of
oxygen consumption was 12.0 milliliters per kilogram of body weight per
meter, which is 3 per cent more than normal. The oxygen cost averaged 0.166
milliliter per kilogram per meter, resulting in a gait efficiency of 90 per
cent. After arthrodesis of the hip, the mean rate of oxygen consumption was
14.9 milliliters per kilogram of body weight per meter, which is 32 per
cent greater than normal. The oxygen cost, 0.223 milliliter per kilogram
per meter, represented a gait efficiency of 53 per cent. The physiological
energy expenditure by the subject after an arthrodesis of the hip was found
to be significantly greater than after an arthrodesis of the ankle and was
more than that reported previously after a total hip arthroplasty for
unilateral degenerative disease.
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