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MRI evaluation of coracoclavicular ligament injury in acromioclavicular joint separation

  • Katsumi TakaseEmail author
Original Article

Abstract

Backgrounds

Acromioclavicular joint separation is divided into three types according to Tossy and six types according to Rockwood. However, the trapezoid and conoid ligaments that constitute the coracoclavicular ligaments are not detailed in these classifications. In this study, we investigated the location and degree of ligament injury in acromioclavicular joint separation by means of magnetic resonance (MR) images.

Study designs

Cross-sectional study.

Methods

The study subjects were 25 patients (21 men and 4 women) ranging in age from 19 to 58 years (mean: 31.1 years). According to Rockwood’s classification criteria, these patients consisted of one case in type 1, seven cases in type 2, seven cases in type 3, and ten cases in type 5. All patients were also performed the procedure for MR images and enhanced MR images with intravenous gadolinium injection within 3 days after the occurrence of injury.

Results

Both the trapezoid and conoid ligaments had ruptured in fifteen cases of the seventeen cases in types 3 and 5. Both ligaments had ruptured at the same locations in eleven of the fifteen cases. However, there were four cases in which the ligaments had ruptured at different locations. On the other hand, the conoid ligaments did not clearly demonstrate abnormal findings, but the trapezoid ligaments had ruptured in all cases of type 2.

Conclusion

The coracoclavicular ligament injuries evaluated by MR images and enhanced MR images were not always coincident with Rockwood’s classification criteria from plain X-ray films, especially in types 2 and 3 of acromioclavicular joint separation.

Keywords

Magnetic resonance images Acromioclavicular joint separations Trapezoid ligaments Conoid ligaments 

Notes

Conflict of interest

No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. I confirm that the contents of the manuscript have not been published or are not being submitted for publication elsewhere.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of Orthopedic SurgeryTokyo Medical UniversityTokyoJapan

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