Article

Cumulative knee adductor load reflects repetitive exposures to medial knee
loading that are encountered during daily activity. The purpose of this proof of
principle study was to investigate whether cumulative knee adductor load
distinguished between adults with and without knee osteoarthritis (OA).
Thirty-one adults with radiographic knee OA (53.2+/-6.1 years old) and 30 healthy
adults (33.5+/-8.0 years old) participated. A non-normalized knee adduction
moment waveform was calculated from gait data collected using a motion analysis
system with synchronized force plate. The peak and impulse from knee adduction
moment was calculated. Cumulative knee adductor load was the product of the knee
adduction moment impulse during stance and the mean number of steps taken per
day, measured with a uni-dimensional accelerometer. One thousand bootstrap
t-tests determined whether cumulative knee adductor load was at least as good as
the peak knee adduction moment in discriminating between the healthy and OA
groups. Cumulative knee adductor load was nearly two times larger in the knee OA
compared to the healthy group (p=0.001). Cumulative knee adductor load was better
than the peak knee adduction moment at discriminating between groups (p=0.04).
This work provides evidence of validity for cumulative knee adductor load. In the
calculation of cumulative loads, non-normalization of the adduction moment
impulse to magnitude or time emphasized the importance of the total loads borne
through the medial knee compartment during each step.
CI - Crown Copyright (c) 2012. Published by Elsevier B.V. All rights reserved.

Langue : ANGLAIS