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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
Published on: February 10, 2015
Dynamic tracking of the scapula using skin-mounted markers
B Lovern1, L A Stroud, R O Evans
1Institute of Medical Engineering and Medical Physics, Cardiff School of Engineering, Cardiff University, Cardiff, UK. lovernb@Cardiff.ac.uk
Summary
This study assessed skin-mounted markers for shoulder movement analysis. While glenohumeral motion was accurate, scapulothoracic lateral rotation showed discrepancies, suggesting potential for predictive modeling.
Area of Science:
- Biomechanics
- Orthopedics
- Kinesiology
Background:
- The shoulder complex's high mobility predisposes it to injuries.
- Current clinical assessments rely on observation and physical exams.
- Accurate kinematic analysis, especially of the scapula, is challenging with non-invasive methods due to tissue interference.
Purpose of the Study:
- To determine the viability of using skin-mounted markers for dynamic scapula movement measurement.
- To compare skin-mounted marker kinematics with the established scapula locator standard.
- To explore the potential for developing predictive models for scapular kinematics.
Main Methods:
- Ten healthy shoulders underwent complete kinematic description using skin-mounted markers.
- Measurements were compared against the gold standard scapula locator.
- Analysis focused on glenohumeral joint elevation and scapulothoracic articulation, specifically lateral rotation.
Main Results:
- Glenohumeral joint elevations measured by skin markers closely matched the scapula locator.
- Significant underestimation of scapulothoracic lateral rotation (over 50 degrees) was observed with skin markers at maximum elevation.
- A correlation greater than 0.7 was found between the two measurement techniques.
Conclusions:
- Skin-mounted markers are suitable for functional glenohumeral kinematic data acquisition.
- Further research is warranted to develop linear regression models for accurate prediction of dynamic scapulothoracic lateral rotation using skin markers.
- This approach may offer a more accessible method for shoulder kinematic analysis in clinical settings.
