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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Does calibration pose improve scapular kinematic repeatability in functional tasks?

Angelica E Lang1

  • 1Canadian Centre for Rural and Agricultural Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|October 6, 2023
PubMed
Summary
This summary is machine-generated.

Accurate scapular motion tracking is difficult. This study found that using a maximum elevation double calibration for scapular kinematics is repeatable for most functional tasks, with minimal detectable changes around 10 degrees.

Keywords:
Arm elevationDigitizerDouble calibrationLocatorShoulder

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Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Orthopedics

Background:

  • Scapular kinematics are crucial for shoulder function.
  • Accurate measurement of scapular motion during functional tasks remains a challenge.
  • Standardized calibration procedures are needed for reliable scapular motion analysis.

Purpose of the Study:

  • To compare the repeatability of scapular kinematics during functional tasks using different calibration procedures.
  • To determine if specific calibration poses enhance measurement reliability.
  • To establish best practices for scapular motion measurement in clinical and research settings.

Main Methods:

  • Optical motion capture tracked the torso, humerus, and scapula in ten participants across two sessions.
  • Scapular calibrations were performed using five distinct poses.
  • Scapular angles were calculated for eight functional tasks at 30° humeral elevation increments.
  • Repeatability was assessed using mean difference, limits of agreement, intraclass correlations, and minimal detectable change (MDC).

Main Results:

  • The maximum elevation double calibration procedure demonstrated good repeatability for most functional tasks.
  • Alternative calibration poses did not significantly improve outcomes compared to the maximum elevation method.
  • Median minimal detectable changes were approximately 10.0° for upward rotation, 13.7° for internal rotation, and 9.8° for tilt.

Conclusions:

  • The maximum elevation double calibration is a reliable method for measuring scapular kinematics in functional tasks.
  • Further research may refine calibration techniques for specific multi-planar movements.
  • Established minimal detectable changes provide benchmarks for interpreting scapular motion alterations.