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The Benefit of a Flexible Ankle-Foot Orthosis on Balance and Walking Ability in Persons With Late Effects of Polio

A Mixed-Methods Study

Brogårdh, Christina, RPT, PhD; Espelund, Christina, RPT, MSc; Lexell, Jan, MD, PhD, DPhilhc

JPO: Journal of Prosthetics and Orthotics: April 2019 - Volume 31 - Issue 2 - p 95–103
doi: 10.1097/JPO.0000000000000249
ORIGINAL RESEARCH ARTICLES
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Introduction Many persons with late effects of polio (LEoP) have muscle weakness in the lower limbs, which affects their balance and walking ability. Although an ankle-foot orthosis (AFO) is commonly prescribed for these persons, there is limited knowledge if an AFO improves their balance and walking ability in terms of speed, distance, and perceived safety. The aims of this study were 1) to assess if a flexible AFO improves dynamic balance as well as indoor and outdoor walking in persons with mild to moderate LEoP and 2) to describe the participants' own perceptions of walking ability and safety, as well as advantages and disadvantages with an AFO.

Materials and Methods A mixed-methods, repeated-measures, crossover design was used. Nineteen participants were assessed at two test occasions, with and without an AFO, with a 1-week interval. Dynamic balance was evaluated with the timed up and go (TUG) test and walking ability by the 10-m fast gait speed (FGS) tests, the 6-minute walk test (6MWT), and timed walking over a 340-m-long pathway outdoors. The Borg Rating of Perceived Exertion (RPE) scale was used to assess perceived exertion. The participants' perceptions of their walking ability and safety as well as advantages and disadvantages with an AFO were evaluated with questionnaires.

Results The AFO significantly improved (P < 0.05) gait speed, outdoor walking, and reduced perceived exertion at one of the test occasions, but had no effect on dynamic balance (P > 0.6). A majority perceived significantly improved walking ability (P < 0.05) and increased walking safety (P < 0.01) with the AFO. Perceived advantages of the AFO were feelings of increased stability and walking distance and reduced risk of falling. Disadvantages were that it could be difficult to put on and uncomfortable to wear.

Conclusions A flexible AFO marginally improves walking ability in persons with LEoP, as assessed quantitatively, but the subjective benefit of walking ability and safety suggests that a flexible AFO can be useful to improve daily functioning. In the future, the design of the AFOs needs to be more user-friendly.

CHRISTINA BROGÅRDH, RPT, PhD; and JAN LEXELL, MD, PhD, DPhilhc, are affiliated with the Department of Health Sciences, Lund University, Lund, Sweden.

CHRISTINA BROGÅRDH, RPT, PhD; and CHRISTINA ESPELUND, RPT, MSc, are affiliated with the Department of Neurology and Rehabilitation Medicine, Skåne University Hospital, Lund, Sweden.

JAN LEXELL, MD, PhD, DPhilhc, is affiliated with the Department of Neuroscience, Rehabilitation Medicine, Uppsala University, Uppsala, Sweden.

Disclosure: The study was supported by grants from Stiftelsen för bistånd till rörelsehindrade i Skåne and the Faculty of Medicine at Lund University, Lund, Sweden.

Correspondence to: Christina Brogårdh, RPT, PhD, Department of Health Sciences, Physiotherapy Research Group, Lund University, 221 00 Lund, Sweden; email: christina.brogardh@med.lu.se

© 2019 by the American Academy of Orthotists and Prosthetists.