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Predicting talocalcaneal joint orientations from talocalcaneal/talocrural joint orientations
J R Engsberg1, S K Grimston, J H Wackwitz
1Department of Sports Sciences and Physical Education, University of Denver, Colorado.
Summary
Predicting talocalcaneal (TC) joint orientation from talocrural joint movements is complex due to individual morphology. Abduction-adduction of the combined joint significantly influences TC orientation, suggesting broader monitoring for better pronation-supination prediction.
Area of Science:
- Biomechanics
- Orthopedics
- Human Movement Science
Background:
- The talocalcaneal (TC) and talocrural joints are critical for foot and ankle function.
- Understanding the relationship between these joints is essential for diagnosing and treating foot pathologies.
- Existing models may oversimplify the complex interactions influencing joint orientation.
Purpose of the Study:
- To assess the predictive capacity of talocalcaneal/talocrural joint orientations for talocalcaneal (TC) joint orientations.
- To investigate the influence of combined joint movements on TC joint positioning.
- To explore the potential for developing foot typologies based on joint morphology for improved predictive accuracy.
Main Methods:
- Utilized a custom orientation-loading fixture with six degrees of freedom for calcaneus and shank positioning.
- Applied loads in three orthogonal directions to simulate physiological conditions.
- Mounted reference pins on calcaneus, talus, and shank segments to capture position data across 243 test situations.
- Employed statistical models and analysis of variance to analyze test data and assess predictive capabilities.
Main Results:
- Observed significant between- and within-specimen variation in joint orientations, attributed to individual joint morphology.
- Found that eversion-inversion orientations of the TC/talocrural joint were not consistently accurate predictors of TC joint orientations.
- Identified abduction-adduction orientations of the combined joint as having the most substantial influence on TC orientations.
Conclusions:
- Eversion-inversion and abduction-adduction monitoring of the combined talocalcaneal/talocrural joint offers greater predictive value for pronation-supination than monitoring eversion-inversion alone.
- Individual joint morphology significantly impacts orientation predictability, necessitating a move beyond average prediction values.
- Development of foot categories based on TC and TC/talocrural joint morphology is recommended for more accurate specimen foot orientation prediction.