KMID : 1036220190220030121
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Clinics in Shoulder and Elbow 2019 Volume.22 No. 3 p.121 ~ p.127
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Relationship of Posterior Decentering of the Humeral Head with Tear Size and Fatty Degeneration in Rotator Cuff Tear
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Kim Jung-Han
Seo Hyeong-Won
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Abstract
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Background: Posterior decentering is not an uncommon finding on rotator cuff tear patients¡¯ shoulder magnetic resonance imaging. No previous study has reported on the relationship between posterior decentering and rotator cuff tear.
Methods: We assessed patients¡¯ rotator cuff tear humeral head positions based on humeral?scapular alignment (HSA). Subjects were classified into centering and decentering groups based on a <2 mm or >2 mm HSA value, respectively. Differences in rotator cuff tear size, degree of tear, and fatty degeneration between the two groups were evaluated.
Results: One hundred seventy-five patients (80 males, 95 females; mean age: 59.7 ¡¾ 6.5 years old) were selected as subjects (case-control study; level of evidence: 3). Tear size, degree of subscapularis tendon tear, and fatty degeneration of the supraspinatus, infraspi-natus, and subscapularis muscles were significantly different between the two groups (p<0.001, p<0.001, p<0.001).
Conclusions: The occurrence of decentering was related to rotator cuff tear size, degree of subscapularis tendon tear, and fatty degen-eration of the rotator cuff muscles.
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KEYWORD
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Rotator cuff injuries, Shoulder joint, Decentering, Humeral?scapular alignment
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