Article

Gait measures are used to evaluate change in patients with knee osteoarthritis
(OA), but reliability has not been fully established in this population. This
study examined test-retest reliability of knee angle and moment gait waveform
characteristics captured using discrete parameters and principal component
analysis (PCA) in individuals with moderate knee OA. Participants (n=20)
underwent three-dimensional gait analysis on two occasions. Motion and force data
were captured using two camera banks, infrared light emitting diodes and force
plate during self-selected walking. Knee angle and moment waveforms were
calculated and analyzed using discrete parameters and by identifying waveform
characteristics using PCA. Intraclass correlation coefficients (ICC2,k) examined
test-retest reliability of discrete parameters and PCA derived scores
(PC-scores). ICC2,k values ranged from 0.57 to 0.93 for discrete parameters,
0.52-0.86 for knee angle PC-scores and 0.30-0.94 for the knee moment PC-scores.
However, 10 of 13 discrete parameters, six of nine knee angle PC-scores and seven
of nine knee moment PC-scores had ICC2,k values greater than or equal to 0.70.
Discrete parameters and PC-scores from flexion angles and adduction moments had
the highest ICC2,k values while adduction angles, rotation angles, and rotation
moments had the lowest. Most knee angle and moment waveform characteristics
demonstrated ICC2,k values that could be interpreted as acceptable. Caution
should be used when examining adduction and rotation angle magnitudes and
early/mid-stance rotation moment magnitudes due to lower ICC2,k values.
CI - Copyright (c) 2013 Elsevier B.V. All rights reserved.

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