Accelerometer-based determination of gait variability in older adults with knee osteoarthritis |
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| Affiliation: | 1. Department of Sport Science, Otto von Guericke University Magdeburg, Zschokkestr. 32, 39104 Magdeburg, Germany;2. Institute for Biomechanics, ETH Zürich, Vladimir-Prelog-Weg 3-4, 8093 Zurich, Switzerland;1. Department of Women''s and Children''s Health, Karolinska Institutet, MotorikLab, Q2:07, Karolinska University Hospital, 171 76 Stockholm, Sweden;2. Department of Physical Therapy, Movement & Rehabilitation Sciences, Bouve College of Health Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;3. Division of Rheumatology, Immunology, and Allergy, Brigham and Women''s Hospital, Harvard Medical School, Boston, MA, USA;4. Gillette Children''s Specialty Healthcare, 200 University Avenue East, St Paul, MN 55101, USA;5. Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA;6. Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, MN, USA;7. Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden;8. Department of Orthopedics, Karolinska University Hospital, 141 86 Stockholm, Sweden;9. Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, 901 87 Umeå, Sweden |
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| Abstract: | Knee osteoarthritis (KOA) can affect the spatiotemporal (ST) aspects of gait as well as the variability of select ST parameters based on standard linear measures of variability (e.g., standard deviation (SD) and coefficient of variation). Non-linear measures (e.g., fractal scaling index (FSI) and sample entropy) can be more sensitive to changes in gait variability, and have been used to quantify differences in the stride patterns of patients with Parkinson’s disease and the motion of ACL-deficient knees. However, the effect of KOA on the dynamic complexity of the stride pattern has not been investigated. Therefore, the purpose of this study was to investigate the effect of KOA on gait variability (linear and non-linear measures) in a group of older adults, and to compare these results to a healthy control group. Participants walked for 10 min with a tri-axial accelerometer placed at the lower back. Mean and SDs of stride time and step time as well as the FSI for the entire series of stride times were calculated for each participant. Participants with KOA had significantly greater mean stride time (p = 0.031) and step time (p = 0.024) than control group participants. While stride and step time variability (SD) were greater in the KOA group, the differences were not significant, nor was the difference in the FSI. Low statistical power (β = 0.40 and 0.30 for stride and step time SD, respectively) combined with the confounding effects of walking speed and heterogeneous KOA severity likely prevented significant differences from being found. |
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| Keywords: | Knee osteoarthritis Gait variability Fractal dynamics Accelerometry |
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