Volume 7 Supplement 1

4th Congress of the International Foot and Ankle Biomechanics Community

Open Access

Is it possible to predict optimal rocker shoe design using barefoot gait parameters?

  • Jonathan D Chapman1,
  • Stephen J Preece1,
  • Christopher J Nester1Email author,
  • Bjoern Braunstein2,
  • Angela Höhne2 and
  • Gert-Peter Brüggermann2
Journal of Foot and Ankle Research20147(Suppl 1):A65

https://doi.org/10.1186/1757-1146-7-S1-A65

Published: 8 April 2014

Background

Curved rocker shoes are routinely prescribed for people with diabetes in order reduce in-shoe plantar pressures. However, previous research has shown that different individuals may require different rocker outsole geometries in order to optimise pressure reduction [1, 2]. This has led some researchers to suggest that every individual should try a range of possible outsole designs to identify the design which maximises pressure reduction [1]. However, this process may not be feasible in a clinical setting. Given that plantar pressure has been shown to depend on specific gait variables [3], it may be possible to develop an algorithm which could predict an individual’s pressure response to a specific rocker outsole design using an input of gait data. Such an algorithm would remove the need to try on a large number of pairs of rocker shoes.

Objective

To investigate the accuracy of an algorithm developed to predict peak plantar pressure for eight different rocker shoes designs from an input of barefoot gait data.

Methods

The eight rocker shoes designs spanned different combinations of two design features: rocker angle (15° or 20°) and apex position (52%, 57%, 62%, 67% shoe length). A total of n=76 patients were recruited into the study and each participant wore each of the eight shoes whilst foot pressure was measured during walking. A gait assessment was then carried out as the participant walked barefoot and a set of gait and anthropometric variables defined as algorithm inputs. A separate algorithm was then developed to predict peak plantar pressure for each of the eight shoes in three different forefoot regions. In order to develop each algorithm, a regression approach was first used identify a suitable subset of inputs and to estimate the percentage of the variance in peak pressure explained by the inputs. A neural network was then developed and tested to assess predictive power.

Results

The regression analysis showed that it was possible to explain between 21% and 47% of the variance in peak pressure, typically with a set of 3-6 gait/anthropometric variables. However, the predictive power of the neural networks was relatively low, between 24-49%

Conclusion

Although the results demonstrated clear correlations between groups of gait/anthropometric variables and peak pressure, the predictive power of the algorithm was not high enough for routine use in clinical practice. This may be because additional input variables, such as bony geometry are required to improve algorithm accuracy.

Declarations

Acknowledgments

We acknowledge support from the EU framework 7 programme (NMP2-SE-2009-229261).

Authors’ Affiliations

(1)
School of Health, Sport and Rehabilitation Sciences, University of Salford
(2)
Institute of Biomechanics and Orthopaedics, German Sport University

References

  1. Chapman J, Preece S, Braunstein B, et al: Effect of rocker shoe design features on forefoot plantar pressures in people with and without diabetes. Clin Biomech. 2013, 28: 679-85. 10.1016/j.clinbiomech.2013.05.005.View ArticleGoogle Scholar
  2. Morag E, Cavanagh PR: Structural and functional predictors of regional peak pressures under the foot during walking. J Biomech. 1999, 32: 359-370. 10.1016/S0021-9290(98)00188-2.View ArticlePubMedGoogle Scholar
  3. van Schie C, Ulbrecht JS, Becker MB, Cavanagh PR: Design criteria for rigid rocker shoes. Foot & Ankle International. 2000, 21: 833-844.Google Scholar

Copyright

© Chapman et al; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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