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The midfoot load shows impaired function after ankle arthrodesis
Arno Frigg1, Juliane Schäfer, Hugh Dougall
1Department of Orthopaedic Surgery, University Hospital Basel, Spitalstrasse 21, CH-4031 Basel, Switzerland. mail@arnofrigg.com
Clinical Biomechanics (Bristol, Avon)
|September 15, 2012
Summary
The midfoot load index effectively distinguishes healthy individuals from those who have undergone ankle or tibiotalocalcaneal arthrodesis. This pedobarographic parameter also correlates with functional outcomes, simplifying foot function assessment post-surgery.
Area of Science:
- Biomechanics
- Orthopedics
- Medical Engineering
Background:
- Pedobarography generates numerous parameters, often requiring specialized interpretation.
- Assessing foot function after arthrodesis presents interpretation challenges due to parameter complexity.
Purpose of the Study:
- To identify key pedobarographic parameters differentiating healthy individuals from patients post-ankle or tibiotalocalcaneal arthrodesis.
- To determine which pedobarographic parameters correlate with the American Orthopaedic Foot and Ankle Society (AOFAS) score.
Main Methods:
- Compared 35 healthy volunteers with 57 ankle and 42 tibiotalocalcaneal arthrodesis patients using dynamic pedobarography and AOFAS scores.
- Reduced 18 basic parameters to two indices (load, rollover) for 9 selected parameters.
- Employed ordinal logistic and multiple linear regression for data analysis.
Main Results:
- The midfoot index of load was the strongest predictor differentiating healthy subjects from arthrodesis patients.
- This index independently predicted AOFAS scores, indicating its clinical relevance.
- Healthy individuals exhibited greater midfoot depression on force/pressure time graphs than arthrodesis patients.
Conclusions:
- Pedobarographic analysis after ankle or tibiotalocalcaneal arthrodesis can be simplified.
- Focusing on the midfoot index of load and force/pressure time graphs aids in interpreting foot function post-surgery.
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