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Kinematic repeatability of a multi-segment foot model for dance
Sarah L Carter1,2, Nahoko Sato3, Luke S Hopper2
1a Podiatric Medicine and Surgery Division, Faculty of Health & Medical Sciences, School of Allied Health , The University of Western Australia , Perth , Australia.
Sports Biomechanics
|July 22, 2017
Summary
This study assessed the reliability of a 3D foot model for ballet dancers. The model showed excellent repeatability for some foot movements, aiding in identifying technical errors in dancers.
Area of Science:
- Biomechanics
- Dance Science
- Sports Medicine
Background:
- Ballet dancers require precise foot control.
- Assessing foot kinematics is crucial for injury prevention and performance enhancement.
- Existing models may not fully capture the complexity of dance-specific foot movements.
Purpose of the Study:
- To evaluate the intra- and inter-assessor repeatability of a modified Rizzoli Foot Model for analyzing ballet dancers' foot kinematics.
- To determine the reliability of specific kinematic measures within the model.
- To identify reliable measures for detecting technical errors and biomechanical abnormalities in dancers' foot motion.
Main Methods:
- Six university-level ballet dancers participated.
- A modified Rizzoli Foot Model was used with reflective markers to capture 3D foot and lower leg kinematics.
- Dancers performed standardized movements including plié, turnout, and flex-point-flex.
- Intra- and inter-assessor reliability were assessed using intraclass correlation coefficients (ICC).
Main Results:
- Excellent intra-assessor reliability (ICC ≥ 0.75) was found for the first metatarsophalangeal joint in the sagittal plane.
- Excellent intra-assessor reliability was observed during flex-point-flex for most inter-segmental angles.
- Inter-assessor repeatability varied (0.5 > ICC ≥ 0.75) for 3D segment rotations, with tibia-foot dorsiflexion/plantar flexion being most repeatable.
- Hindfoot-midfoot adduction/abduction showed the least repeatability, potentially due to marker placement inconsistencies.
Conclusions:
- The 3D dance-specific multi-segment foot model demonstrates good to excellent reliability for specific kinematic measures in ballet dancers.
- The model can reliably assess sagittal plane motion of the first metatarsophalangeal joint and overall tibia-foot dorsiflexion/plantar flexion.
- Variability in inter-assessor results highlights the importance of consistent marker placement for accurate kinematic analysis in dancers.
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