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Arch Phys Med Rehabil. 2016 Jul;97(7):1107-14. doi: 10.1016/j.apmr.2015.12.007. Epub 2015 Dec 23.

Upright Magnetic Resonance Imaging Tasks in the Knee Osteoarthritis Population: Relationships Between Knee Flexion Angle, Self-Reported Pain, and Performance.

Author information

1
Human Performance and Engineering Research, Kessler Foundation, West Orange, NJ.
2
Kessler Institute for Rehabilitation, West Orange, NJ; Department of Physical Medicine and Rehabilitation, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ.
3
Human Performance and Engineering Research, Kessler Foundation, West Orange, NJ; Department of Physical Medicine and Rehabilitation, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ. Electronic address: pbarrance@kesslerfoundation.org.

Abstract

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.

KEYWORDS:

Knee; Magnetic resonance imaging; Osteoarthritis; Rehabilitation

PMID:
26723855
DOI:
10.1016/j.apmr.2015.12.007
[Indexed for MEDLINE]

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