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Marker cluster rigidity in a multi-segment foot model
Po-Hsiang Chan1, Julie Stebbins2, Amy B Zavatsky1
1Department of Engineering Science, University of Oxford, Oxford, UK.
Journal of Biomechanics
|January 23, 2019
Summary
The rigid body assumption in multi-segment foot models (MSFM) may be inappropriate, especially for the forefoot. This study quantified marker cluster deformation during gait, revealing significant forefoot and tibia movement.
Area of Science:
- Biomechanics
- Orthopedics
- Gait Analysis
Background:
- Multi-segment foot models (MSFM) are crucial for diagnosing and treating foot deformities.
- These models simplify the leg and foot into rigid segments, a simplification potentially problematic for the flexible forefoot.
Purpose of the Study:
- To investigate the validity of the rigid body assumption for marker clusters in a common MSFM.
- To quantify the deformation of tibia, hindfoot, and forefoot marker clusters during a gait cycle.
Main Methods:
- Calculated the rigid body error (σRBE) for marker clusters in 64 healthy adults during gait analysis.
- Analyzed deformation patterns of tibia, hindfoot, and forefoot clusters across the gait cycle.
Main Results:
- The hindfoot cluster showed minimal deformation.
- The forefoot cluster exhibited significant deformation, particularly at the stance phase's beginning and end.
- The tibia cluster deformed throughout the gait cycle, mirroring knee flexion patterns.
Conclusions:
- The rigid body assumption in MSFMs warrants re-evaluation, especially concerning the forefoot.
- Findings suggest current MSFM simplifications may not accurately represent foot biomechanics during gait.
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