The Journal of Bone and Joint Surgery, Vol 65, Issue 5 605-613, Copyright © 1983 by Journal of Bone and Joint Surgery, Inc
Quantitative gait analysis after total knee arthroplasty for monarticular degenerative arthritis
SR Simon, HW Trieshmann, RG Burdett, FC Ewald and CB Sledge
By quantitative gait analysis, we characterized the functional results of
total knee arthroplasty in a group of twelve elderly patients with isolated
degenerative arthritis of one knee. All patients had had a standard
replacement arthroplasty performed at least two years before the study. In
the gait analysis we used high-speed movie cameras synchronized with force
platforms and electromyograms to provide kinetic and kinematic data. The
data were compared with those obtained from an age-matched control group.
In the patients most of the measurements of gait had been restored to
normal levels. These measurements included: velocity; stride length; arcs
of motion of the hip, knee, and ankle bilaterally; phasic muscle activity;
and the amount of mechanical work performed. There were three patterns of
external torque across the implants and in the control knee which were
comparable in magnitude but varied in relative frequency between the two
groups. As compared with the controls, the patients spent approximately 30
per cent more time in double-limb stance and had prolonged cycle times.
These findings may have been the result of muscle weakness, neural
impairment, or habit, but the cause could not be determined by this study.
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