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Model variations for tracking the trunk during sports testing in a motion capture lab.

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  • 1Orthopedic and Sports Medicine Center, Scottish Rite for Children, Dallas, TX, United States.

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Summary

Adjusting sternum marker placement improves trunk motion tracking for athletes. The Mid-Sternum model offers excellent agreement for gait and drop vertical jump (DVJ) analysis, ensuring consistent athlete monitoring.

Keywords:
biomechanicskneemotion analysisreturn-to-sporttrunk

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Area of Science:

  • Biomechanics
  • Sports Science
  • Motion Capture Technology

Background:

  • Motion capture is increasingly used for athlete monitoring and return-to-play protocols.
  • Standardized trunk kinematics modeling is crucial for consistent data interpretation.

Purpose of the Study:

  • To evaluate the influence of adjusted sternum marker placement and removal of potentially occluded markers on trunk kinematics.
  • To compare different trunk marker set variations against a definition model during gait and drop vertical jump (DVJ).

Main Methods:

  • Eighteen participants performed gait and DVJ tasks.
  • Trunk kinematics were calculated using a definition model and three variations (Mid-Sternum, No-Thorax).
  • Intraclass correlation coefficients assessed model agreement.

Main Results:

  • The Mid-Sternum model, with a marker placed at the midpoint between the xiphoid process and jugular notch, showed the least discrepancies and excellent agreement.
  • The No-Thorax model (omitting the thorax marker) demonstrated the largest kinematic differences during the DVJ.

Conclusions:

  • Marker placement consistency is vital for reliable trunk motion tracking in dynamic activities.
  • Adjusting the xiphoid process marker superiorly is recommended before data collection.
  • A recommended trunk marker set includes jugular notch, mid-sternum, and T1/T10 spinous processes.