Rotator cuff tears: association with acromion angulation on MRI

Abstract Objective Using magnetic resonance imaging (MRI), evaluate the correlation of acromion angulation with thickening of the coracoacromial ligament (CAL) and narrowing of the subacromial space resulting in impingement upon the rotator cuff tendons. Materials and methods Eighty-nine shoulder MR...

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Bibliographic Details
Published in:Clinical imaging 2012-11, Vol.36 (6), p.791-796
Main Authors: McGinley, Joseph C, Agrawal, Sundeep, Biswal, Sandip
Format: Article
Language:English
Subjects:
Acromion
Acromion - pathology
Adolescent
Adult
Aged
Aged, 80 and over
Anatomy
Biomechanics
Cuffs
Deltas
Female
Humans
Ligaments
Magnetic resonance imaging
Magnetic Resonance Imaging - methods
Male
Middle Aged
Pathology
Patients
Radiology
Reproducibility of Results
Rotator cuff
Rotator Cuff - pathology
Rotator Cuff Injuries
Sensitivity and Specificity
Shoulder
Shoulder Impingement Syndrome - etiology
Shoulder Impingement Syndrome - pathology
Shoulders
Statistical analysis
Tearing
Thickening
Young Adult
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Summary:Abstract Objective Using magnetic resonance imaging (MRI), evaluate the correlation of acromion angulation with thickening of the coracoacromial ligament (CAL) and narrowing of the subacromial space resulting in impingement upon the rotator cuff tendons. Materials and methods Eighty-nine shoulder MRI studies performed on a 3T scanner were retrospectively analyzed by two blinded independent reviewers. Measurements of the acromion angle (delta angle), CAL thickness and distance between the CAL and humeral head were obtained. The data were categorized into two groups, delta angle less that and greater than 7.5°. The presence or absence of full thickness (FT) or near full thickness (NFT) rotator cuff tears was noted. Results In group 1, the acromion angle varied from -6.8 to 6.8° (1.7±3.5°) with a CAL thickness of 0.91±0.20 mm and a subacromial distance of 6.47±0.88 mm. Group 2 acromion angle varied from 7.6° to 46.8° (18.0°±8.1°) with a CAL of 1.77±0.51 mm and a subacromial distance of 4.52±0.82 mm. The difference in CAL thickness and subacromial distance were significantly different between the two groups ( P
ISSN:0899-7071
1873-4499
DOI:10.1016/j.clinimag.2012.04.007