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Validity and repeatability of three in-shoe pressure measurement systems

Price, C; Parker, DJ; Nester, CJ

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Authors

CJ Nester



Abstract

In-shoe pressure measurement devices are used in research and clinic to quantify plantar foot pressures. Various devices are available, differing in size, sensor number and type; therefore accuracy and repeatability. Three devices (Medilogic, Tekscan and Pedar) were examined in a 2 day×3 trial design, quantifying insole response to regional and whole insole loading. The whole insole protocol applied an even pressure (50-600kPa) to the insole surface for 0-30s in the Novel TruBlue™ device. The regional protocol utilised cylinders with contact surfaces of 3.14 and 15.9cm(2) to apply pressures of 50 and 200kPa. The validity (% difference and Root Mean Square Error: RMSE) and repeatability (Intra-Class Correlation Coefficient: ICC) of the applied pressures (whole insole) and contact area (regional) were outcome variables. Validity of the Pedar system was highest (RMSE 2.6kPa; difference 3.9%), with the Medilogic (RMSE 27.0kPa; difference 13.4%) and Tekscan (RMSE 27.0kPa; difference 5.9%) systems displaying reduced validity. The average and peak pressures demonstrated high between-day repeatability for all three systems and each insole size (ICC≥0.859). The regional contact area % difference ranged from -97 to +249%, but the ICC demonstrated medium to high between-day repeatability (ICC≥0.797). Due to the varying responses of the systems, the choice of an appropriate pressure measurement device must be based on the loading characteristics and the outcome variables sought. Medilogic and Tekscan were most effective between 200 and 300kPa; Pedar performed well across all pressures. Contact area was less precise, but relatively repeatable for all systems.

Citation

Price, C., Parker, D., & Nester, C. (2016). Validity and repeatability of three in-shoe pressure measurement systems. Gait & Posture, 46, 69-74. https://doi.org/10.1016/j.gaitpost.2016.01.026

Journal Article Type Article
Acceptance Date Jan 27, 2016
Online Publication Date Feb 28, 2016
Publication Date May 1, 2016
Deposit Date May 6, 2016
Publicly Available Date Feb 28, 2017
Journal Gait & Posture
Print ISSN 0966-6362
Publisher Elsevier
Volume 46
Pages 69-74
DOI https://doi.org/10.1016/j.gaitpost.2016.01.026
Publisher URL http://dx.doi.org/10.1016/j.gaitpost.2016.01.026
Related Public URLs http://www.journals.elsevier.com/gait-and-posture/

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