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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.

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|July 22, 2017
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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.

Keywords:
Biomechanicsballeten pointejoint rotation

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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.