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Kinematic MR imaging of the shoulder: normal patterns
N Sans1, G Richardi, J J Railhac
1Service Central d'Imagerie Médicale, Centre Hospitalien Universitaire, Purgan, Toulouse, France.
AJR. American Journal of Roentgenology
|December 1, 1996
Summary
Kinematic MR imaging reveals normal glenohumeral joint motion, showing anterior labrum mobility and posterior labrum stability in healthy volunteers. This dynamic evaluation aids in understanding shoulder instability components.
Area of Science:
- Orthopedics
- Radiology
- Biomechanics
Background:
- Shoulder instability is a common clinical problem.
- Understanding normal glenohumeral joint mechanics is crucial for diagnosis.
- Kinematic magnetic resonance (MR) imaging offers dynamic assessment capabilities.
Purpose of the Study:
- To define the normal kinematic patterns of the glenohumeral joint using MR imaging in healthy volunteers.
- To evaluate the dynamic behavior of the anterior and posterior labrum and the anterior joint capsule during rotation.
Main Methods:
- Twenty healthy volunteers (39 shoulders) underwent MR imaging using a 1.5-T imager.
- Successive fast low-angle shot images were acquired in the axial plane from full internal to full external rotation.
- Imaging covered superior, middle, and inferior glenoid levels.
Main Results:
- The anterior labrum showed slight mobility and shape/signal intensity changes in 54% of cases during internal rotation.
- The posterior labrum remained motionless in 97% of cases with no observed changes.
- The anterior joint capsule exhibited slack (51%) or folded (14%) patterns during rotation.
Conclusions:
- Kinematic MR imaging allows dynamic evaluation of glenohumeral joint structures.
- It provides insights into the labrocapsular ligamentous complex, aiding in the assessment of shoulder instability.