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Biomechanical Effects of Variable Stiffness Shoes in Normal Walking After 60-minute Adaptation

  • Jaeyeon Wee
  • Jee Chin Teoh
  • Taeyong LeeEmail author
Regular Paper
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Abstract

The use of variable stiffness shoes (VSS) has been found to be conducive to reducing external knee adduction moment (EKAM). However, it is still unknown whether the claimed biomechanical effects of VSS remain after the subjects have adapted to the footwear. The objective of the study is to examine the effects of VSS immediately upon usage, as well as its effects after 60 min of adaptation. It is hypothesized that the lowering of EKAM is not just the short term biomechanical response due to the immediate use of VSS. Twenty subjects were instructed to walk in three shod conditions which are walking in control shoes, walking in VSS, and walking in VSS after 60-min of adaptation. All of the dynamic exercises were recorded simultaneously by VICON Motion Systems (Oxford Metric, UK). The results showed that EKAM was significantly reduced with the immediate use of VSS (8.43%, p < 0.05), as compared to the control shoes. The reduction remained significant, even after the given 60-min adaptation time. The effect of VSS on the reduction of EKAM is found to be consistent, even after familiarization. The use of VSS is postulated to be helpful in alleviating the loading across the medial compartment of the knee joint.

Keywords

Knee osteoarthritis (OA) Variable stiffness shoe (VSS) External knee adduction moment (EKAM) 

Notes

Acknowledgements

This study was supported by National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (NRF-2019R1F1A1058182).

Compliance with ethical standards

Conflict of interest

The authors declared that they have no conflict of interest.

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Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  1. 1.Division of Mechanical and Biomedical Engineering, ELTEC College of EngineeringEwha Womans UniversitySeoulRepublic of Korea

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