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Descriptive Quantitative Analysis of First Metatarsal Sagittal Plane Motion
Andrew J Meyr1, Christopher Berkelbach2, Christopher Dreikorn2
1Clinical Professor, Department of Podiatric Surgery, Temple University School of Podiatric Medicine, Philadelphia, PA.
Summary
First ray sagittal plane motion, crucial for hallux valgus assessment, is best viewed as a continuous variable. This study quantifies normal motion ranges, aiding in objective clinical decision-making for foot deformities.
Area of Science:
- Orthopedics
- Biomechanics
- Podiatry
Background:
- First ray sagittal plane motion is a key physical exam component for hallux valgus.
- Hypermobility traditionally guides surgical decisions, including first metatarsal-medial cuneiform arthrodesis.
- Objective quantification of first ray motion is needed for accurate assessment.
Purpose of the Study:
- To analyze first ray sagittal plane motion in a large population.
- To determine descriptive quantitative characteristics of first ray motion data.
- To provide objective data for differentiating normal from abnormal motion.
Main Methods:
- Measured first metatarsal sagittal plane motion using a Klaue device.
- Analyzed data from 149 subjects (298 feet).
- Assessed distribution, skewness, kurtosis, and compared motion between sides, sexes, and age.
Main Results:
- Mean total first metatarsal sagittal plane motion was 9.37 ± 2.39 mm.
- Data exhibited characteristics of a normal distribution.
- No significant differences in motion were found between right/left feet, males/females, or with age.
Conclusions:
- First ray sagittal plane motion should be considered a continuous variable.
- This approach can help objectify the distinction between normal and abnormal motion.
- Findings support a more nuanced understanding of first ray biomechanics in hallux valgus.
