Abstract
The rotator interval contains several important anatomical structures that contribute
to the stability and normal function of the shoulder joint including the biceps tendon,
coracohumeral ligament, superior glenohumeral ligament, rotator interval capsule,
anterior fibers of the supraspinatus tendon, and superior fibers of the subscapularis
tendon. Rotator interval pathology is associated with biceps instability, glenohumeral
instability, and adhesive capsulitis, all of which can be challenging to clinically
diagnose and treat. The complex anatomy and orientation of the rotator interval structures
within a relatively small space can make it difficult to evaluate by imaging; however,
improvements in MR technology have allowed better detection of disease in this region.
Furthermore, the rotator interval is not routinely evaluated arthroscopically unless
the clinical examination or imaging findings suggest pathology at this level. Imaging,
therefore, can play a significant role in helping the clinician make the diagnosis
and initiate appropriate treatment. This article discusses the normal anatomy and
biomechanics of the rotator interval and its structures as well as the normal and
pathologic appearances on imaging and the treatment options of abnormalities of structures
in this region.
Keywords
rotator interval - biceps tendon - MR imaging - anatomy - pathology
