Article

OBJECTIVE: To characterize the ability of patients with symptomatic knee
osteoarthritis (OA) to perform a weight-bearing activity compatible with upright
magnetic resonance imaging (MRI) scanning and how this ability is affected by
knee pain symptoms and flexion angles. DESIGN:
Cross-sectional observational
study assessing effects of knee flexion angle, pain level, and study sequence on
accuracy and duration of performing a task used in weight-bearing MRI evaluation.
Visual feedback of knee position from an MRI compatible sensor was provided. Pain
levels were self-reported on a standardized scale. SETTING: Simulated MRI setup
in a research laboratory. PARTICIPANTS: Convenience sample of individuals (N=14;
9 women, 5 men; mean, 69+/-14y) with symptomatic knee OA. INTERVENTIONS: Not
applicable. MAIN OUTCOME MEASURES: Averaged absolute and signed angle error from
target knee flexion for each minute of trial and duration tolerance (the duration
that subjects maintained position within a prescribed error threshold). RESULTS:
Absolute targeting error increased at longer trial durations (P<.001). Duration
tolerance decreased with increasing pain (mean +/- SE, no pain: 3min 19s+/-11s;
severe pain: 1min 49s+/-23s; P=.008). Study sequence affected duration tolerance
(first knee: 3min 5s+/-9.1s; second knee: 2min 19s+/-9.7s; P=.015). CONCLUSIONS:
The study provided evidence that weight-bearing MRI evaluations based on imaging
protocols in the range of 2 to 3 minutes are compatible with patients reporting
mild to moderate knee OA-related pain.
CI - Copyright (c) 2016 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS