Article

Hip joint centre (HJC) regression equation error during paediatric gait has
recently been shown to have clinical significance. In relation to adult gait, it
has been inferred that comparable errors with children in absolute HJC position
may in fact result in less significant kinematic and kinetic error. This study
investigated the clinical agreement of three commonly used regression equation
sets (Bell et al., Davis et al. and Orthotrak) for adult subjects against the
equations of Harrington et al. The relationship between HJC position error and
subject size was also investigated for the Davis et al. set. Full 3-dimensional
gait analysis was performed on 12 healthy adult subjects with data for each set
compared to Harrington et al. The Gait Profile Score, Gait Variable Score and
GDI-kinetic were used to assess clinical significance while differences in HJC
position between the Davis and Harrington sets were compared to leg length and
subject height using regression analysis. A number of statistically significant
differences were present in absolute HJC position. However, all sets fell below
the clinically significant thresholds (GPS <1.6 degrees , GDI-Kinetic <3.6
points). Linear regression revealed a statistically significant relationship for
both increasing leg length and increasing subject height with decreasing error in
anterior/posterior and superior/inferior directions. Results confirm a negligible
clinical error for adult subjects suggesting that any of the examined sets could
be used interchangeably. Decreasing error with both increasing leg length and
increasing subject height suggests that the Davis set should be used cautiously
on smaller subjects.
CI - Copyright (c) 2016 Elsevier B.V. All rights reserved.

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