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Transformation between different local coordinate systems of the scapula
1Liberty Mutual Research Institute for Safety, Hopkinton, MA 01748, USA. Xu.Xu@libertymutual.com
Journal of Biomechanics
|September 4, 2012
Summary
This study developed transformation matrices to standardize scapula coordinate systems, enabling consistent comparison of shoulder kinematics across research. This facilitates building accurate biomechanical models using the International Society of Biomechanics standard.
Area of Science:
- Biomechanics
- Orthopedics
- Anatomy
Background:
- Comparing scapular kinematics across studies is challenging due to multiple local coordinate systems (LCSs).
- A standardized method is needed to reconcile data from different scapular LCSs.
Purpose of the Study:
- To derive transformation matrices between various scapular LCSs.
- To express scapular muscle and ligament coordinates relative to the International Society of Biomechanics (ISB)-recommended LCS.
Main Methods:
- Digitized bony landmarks on 13 CT-scanned scapulae to construct LCSs.
- Calculated transformation equations based on these LCSs.
- Applied transformation equations to determine coordinates of 28 scapular muscles and ligaments.
Main Results:
- Successfully generated transformation matrices between different scapular LCSs.
- Provided coordinates for 28 scapular muscles and ligaments in the ISB-recommended LCS.
Conclusions:
- The derived transformation matrices facilitate consistent comparison of scapular kinematics data.
- This work supports the development of scapular biomechanical models aligned with the ISB-recommended LCS.
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