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• Clinical Article •
Tear of the antero-inferior shoulder capsule: evaluation with shoulder MR arthrography
TIAN Chun-yan  ZHENG Zhuo-zhao 

DOI:10.3969/j.issn.1674-8034.2012.04.003.


[Abstract] Objective: To evaluate the efficacy of shoulder MR arthrography in identification of the antero-inferior capsular tear and to summary its imaging manifestation.Materials and Methods: A retrospective study was undertaken in 183 cases of shoulder instability confirmed by subsequent shoulder arthroscopy. Two radiologists analyzed all shoulder MR arthrograms independently, and imagine findings were compared with those of arthroscopy. Sensitivities and specificities were calculated. k value was calculated to quantify the level of interobserver agreement.Results: Antero-inferior capsular tear were arthroscopically diagnosed in 28 (15.3%) of the 183 patients. Sensitivities and specificities of MR arthrographic detection of capsular tear were 57.1%—67.9% and 96.7%-98.7%, respectively. At inter-observer comparison, agreement was good (K=0.698). MR arthrographic findings of antero-inferior capsular tear were discontinuity of the antero-inferior capsule (14/28), discontinuity of the anterior band of the inferior glenohumeral ligaments (5/28), laxity of the anterior capsular (6/28), and normal appearance of the capsule (3/28).Conclusion: Disruption of the antero-inferior capsule and the anterior band of the inferior glenohumeral ligament are the main MR arthrographic manifestations of the antero-inferior capsular tear, and these signs have moderate sensitivity and high specificity.
[Keywords] Shoulder joint；Wounds and injury；Magnetic resonance imaging

TIAN Chun-yan Department of Radiology, Peking University Third Hospital, Beijing 100191, China

ZHENG Zhuo-zhao * Department of Radiology, Peking University Third Hospital, Beijing 100191, China

*Correspondence to: Zheng ZZ, E-mail: zzhuozhao@yahoo.com.cn

Conflicts of interest   None.

Received  2012-06-12
Accepted  2012-06-29
DOI: 10.3969/j.issn.1674-8034.2012.04.003
DOI:10.3969/j.issn.1674-8034.2012.04.003.

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