Abstract
Background and aim: Inexpensive methods for characterizing lower-limb prosthetic gait allow clinicians to monitor gait quality. This study assessed an established method for estimating step length using a low-cost accelerometer to estimate distance walked in lower-limb prosthesis users and explore the use of subject-specific correction factors. Technique: A three-axis accelerometer was attached to participants using straps. Validity and test-retest reliability of step length was assessed in able-bodied individuals using a motion capture system. Validity of distance walked was assessed with lower-limb prosthesis users. A regression equation was developed for prosthesis users to estimate a correction factor that minimized error. Discussion: The system demonstrated excellent reliability and minimal mean error for both participant groups, but subject-specific correction factors did not provide substantial benefit. Estimate variability was high, suggesting the need for further refinement. Estimating distance walked and step length from low-cost accelerometers may be a valid, clinically accessible method for characterizing prosthetic gait. Clinical relevance The use of a low-cost accelerometer may provide valid means for estimating step length and distance walked of lower-limb prosthesis users in a clinical environment for monitoring patient outcomes.
Original language | English (US) |
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Pages (from-to) | 643-648 |
Number of pages | 6 |
Journal | Prosthetics and orthotics international |
Volume | 40 |
Issue number | 5 |
DOIs | |
State | Published - Oct 1 2016 |
Funding
This work was supported by the National Institutes of Health (grant number 3UL1RR025741), National Institute on Disability and Rehabilitation Research (grant numbers H133P110013 and H133E080009), and the David Rubin, MD, Enrichment Fund. The opinions contained in this article are those of the authors and do not necessarily reflect those of the US Department of Education or Health and Human Services.
Keywords
- Gait analysis
- evaluation studies
- gait
- prosthetic feet
- prosthetics
- rehabilitation
- rehabilitation of prostheses users
- study design
ASJC Scopus subject areas
- Health Professions (miscellaneous)
- Rehabilitation