Abstract
Background
The purpose of this study was to clarify the relationship between superior migration of the humeral head and findings of biceps labrum complex (BLC) in large or massive rotator cuff tears.
Methods
Forty-nine shoulders that underwent surgery for torn supraspinatus and infraspinatus tendons were included. Patients were divided into two groups according to the acromio—humeral interval (AHI). Arthroscopic findings of BLC were classified into five types; Type 0; normal shape, Type 1: fraying; Type 2: detachment; Type 3: attrition of BLC and superior glenoid; and Type 4: defect.
Results
The group without migration (AHI ≥ 7 mm) consisted of 21 shoulders and that with migration (AHI < 7 mm) was 28 shoulders. There were significantly more patients with Types 2, 3, and 4 in the group with migration than without migration.
Conclusion
This study indicates a potential relationship between BLC injury and superior humeral head migration accompanied by a rotator cuff tear.