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Rheumatology (Oxford). 2018 Oct 1;57(10):1735-1742. doi: 10.1093/rheumatology/key162.

The immediate effect of a soft knee brace on dynamic knee instability in persons with knee osteoarthritis.

Author information

1
Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam Movement Sciences, Academic Medical Center, Amsterdam, The Netherlands.
2
Amsterdam Rehabilitation Research Center, Academic Medical Center, Amsterdam, The Netherlands.
3
Department of Radiology and Nuclear Medicine, Musculoskeletal Imaging Quantification Center, Academic Medical Center, Amsterdam, The Netherlands.
4
Centre for Health, Exercise and Sports Medicine, Department of Physiotherapy, University of Melbourne, Melbourne, Victoria, Australia.
5
Jan van Breemen Research Institute, VU University Medical Center, Amsterdam.
6
Amsterdam Rheumatology & Immunology Centre, Amsterdam Medical Center, Reade, VU University Medical Center, Amsterdam.
7
Delft University of Technology, Delft, The Netherlands.
8
Department of Psychiatry, VU University Medical Center, Amsterdam, The Netherlands.

Abstract

Objectives:

Wearing a soft knee brace has been shown to reduce self-reported knee instability in persons with knee OA. There is a need to assess whether a soft knee brace has a beneficial effect on objectively assessed dynamic knee instability as well. The aims of the study were to evaluate the effect of a soft knee brace on objectively assessed dynamic knee instability and to assess the difference in effect between a non-tight and a tight soft knee brace in persons with knee OA.

Methods:

Thirty-eight persons with knee OA and self-reported knee instability participated in a laboratory study. A within-subject design was used comparing no brace vs brace and comparing a non-tight vs a tight brace. The primary outcome measure was dynamic knee instability, expressed by the perturbation response (PR). The PR reflects deviation in the mean knee varus-valgus angle during level walking after a controlled mechanical perturbation. Linear mixed-effect model analysis was used to evaluate the effect of a brace on dynamic knee instability.

Results:

Wearing a brace significantly reduced the PR compared with not wearing a brace (B = -0.16, P = 0.01). There was no difference between a non-tight and a tight brace (B = -0.03, P = 0.60).

Conclusion:

This study is the first to report that wearing a soft knee brace reduces objectively assessed dynamic knee instability in persons with knee OA. Wearing a soft brace results in an objective improvement of knee instability beyond subjectively reported improvement.

Trial registration:

Nederlands Trial register (trialregister.nl) NTR6363.

PMID:
29931372
DOI:
10.1093/rheumatology/key162
[Indexed for MEDLINE]

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