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Incorporating subject-specific geometry to compare metatarsal stress during running with different foot strike
M A Ellison1, M Kenny1, J Fulford2
1Sport and Health Sciences, University of Exeter, Exeter, UK.
Journal of Biomechanics
|April 25, 2020
Summary
Non-rearfoot strikers experience higher internal second metatarsal stress during early stance compared to rearfoot strikers. However, peak stresses do not differ, highlighting the importance of bone geometry in stress analysis for runners.
Area of Science:
- Biomechanics
- Orthopedics
- Sports Medicine
Background:
- Second metatarsal stress fractures are common in runners.
- Foot strike patterns influence external loading but not internal metatarsal stress.
- Accurate subject-specific models are needed to understand internal bone loading.
Purpose of the Study:
- Compare second metatarsal stress in barefoot runners with rearfoot vs. non-rearfoot strike patterns.
- Utilize a novel subject-specific mathematical model with precise metatarsal geometry.
- Investigate the relationship between external loading and internal bone stress.
Main Methods:
- Collected synchronized force and kinematic data during barefoot overground running from 20 participants.
- Developed subject-specific beam theory models of the second metatarsal.
- Calculated stresses at the plantar and dorsal midshaft periphery.
Main Results:
- Non-rearfoot strikers exhibited greater external loading, bending moments, and compressive forces than rearfoot strikers.
- No significant differences in peak second metatarsal stresses were found between the groups.
- Non-rearfoot strikers showed higher stresses during early stance, but not peak stress.
Conclusions:
- Subject-specific bone geometry is crucial for accurate bone stress estimation.
- External forces are not always representative of internal bone loading.
- Foot strike patterns may influence the timing and distribution of metatarsal stress, not necessarily peak magnitude.
