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Three-dimensional motion analysis for validation of shoulder internal rotation
Michael W Maier1, Sarah Erhard1, Mirjam Niklasch1
1Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, 69118, Heidelberg, Germany.
Archives of Orthopaedic and Trauma Surgery
|April 6, 2017
Summary
The Constant-Murley score
Area of Science:
- Orthopedics
- Biomechanics
- Shoulder Kinematics
Background:
- The Constant-Murley score (CMS) allocates 10% of points to internal rotation (IR) capacity.
- Current assessment methods lack detailed 3D validation for reaching specific landmarks.
Purpose of the Study:
- To validate the Constant-Murley score's internal rotation measurement.
- To quantify the 3D degree of internal rotation required for specific landmarks.
Main Methods:
- Sixteen healthy volunteers underwent 3D motion analysis.
- Internal rotation was measured using thumb and hand dorsum to reach six defined anatomical landmarks.
Main Results:
- Significant increases in internal rotation were observed as landmarks progressed from thigh to interscapular.
- Both thumb and hand dorsum methods showed significant IR increases between all positions.
- A notable difference in IR was found between positions 1 (thigh) and 2 (buttock).
Conclusions:
- The CMS method for measuring internal rotation is suitable.
- Small IR gains (10°) between positions 3-5 may pose challenges for standard goniometer measurement.