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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
Published on: March 12, 2021
Humeroscapular positions in a shoulder range-of-motion-examination.
M L Pearl1, S Jackins, S B Lippitt
1From the University of Washington, Department of Orthopaedics, Seattle, Wash.
Journal of Shoulder and Elbow Surgery
|September 11, 2012
Summary
This study introduces a new clinical method to measure humeroscapular positions, crucial for understanding shoulder joint mechanics and improving treatment for shoulder pathology.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- Traditional arm position descriptions focus on the thorax, neglecting the glenohumeral joint.
- Assessing relative humerus-scapula motion is challenging due to a lack of standardized clinical methods.
Purpose of the Study:
- To propose and validate a clinical method for describing and measuring humeroscapular positions.
- To establish a baseline of normal humeroscapular motion relative to the scapular plane.
Main Methods:
- Defined the scapular plane using four palpable anatomic landmarks.
- Developed a method to measure humeroscapular positions using a goniometer and a custom device.
- Recorded humeroscapular positions in 75 healthy subjects during standard shoulder range-of-motion tests.
Main Results:
- Maximal arm elevation occurred with the humerus slightly posterior to the scapular plane at 90° humeroscapular elevation.
- Cross-body adduction involved significant scapulothoracic motion, with the humerus positioned anterior to the scapular plane.
- External rotation at 90° elevation placed the humerus posterior to the scapular plane.
Conclusions:
- The proposed method provides a reliable way to describe humeroscapular motion.
- Understanding humeroscapular positioning is vital for accurate diagnosis and effective treatment of shoulder conditions.
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