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[Cine-MRI of the shoulder. Normal aspects]
N Sans1, G Richardi, D Fourcade
1Service Central d'Imagerie Médicale, CHU Purpan, Toulouse.
Journal De Radiologie
|February 1, 1996
Summary
Kinematic MR imaging reveals normal glenohumeral joint motion in asymptomatic volunteers. This dynamic assessment provides insights into labro-capsular structures, crucial for understanding shoulder instability.
Area of Science:
- Orthopedics
- Radiology
- Biomechanics
Context:
- Shoulder instability is a common clinical problem.
- Understanding normal glenohumeral joint dynamics is essential for diagnosis.
- Previous studies have primarily used static imaging techniques.
Purpose:
- To define the normal kinematic patterns of the glenohumeral joint using magnetic resonance (MR) imaging in asymptomatic volunteers.
- To assess the dynamic behavior of the labro-capsular complex during rotation.
Summary:
- Twenty asymptomatic volunteers (39 shoulders) underwent 1.5 Tesla MR imaging with successive Flash acquisitions at varying degrees of internal to external rotation.
- The anterior labrum showed slight mobility at its free edge but immobility at its base, with shape and signal intensity changes in internal rotation.
- The posterior labrum remained largely immobile, and the inferior labro-capsular ligamentous complex was consistently visualized. The anterior capsular joint demonstrated tautness in external rotation and laxity or folding in internal rotation.
Impact:
- Kinematic MR imaging enables dynamic assessment of anatomical structures involved in shoulder instability.
- This technique provides valuable information regarding the labro-capsular ligamentous complex.
- Findings contribute to a better understanding of normal glenohumeral joint mechanics and can aid in diagnosing shoulder instability.