Hye Jung Choo MD, Abstract Co-Author: Nothing to Disclose

Gi Won Shin MD, Presenter: Nothing to Disclose

Sun Joo Lee MD, Abstract Co-Author: Nothing to Disclose

Young Mi Park MD, PhD, Abstract Co-Author: Nothing to Disclose

Young Jun Cho, Abstract Co-Author: Nothing to Disclose

Seok Jin Choi, Abstract Co-Author: Nothing to Disclose

The presence of delaminated tears of the rotator cuffs has been reported as a negative prognostic factor after rotator cuff repairs. However, there are a few radiologic reports about delaminated tears of the rotator cuff. In this study, the prevalence, characteristics, and diagnostic accuracy of delaminated tears at the supraspinatus–infraspinatus tendons (SST-IST) were evaluated on indirect MR arthrography.

Indirect MR arthrography of 231 shoulders with tears at the SST-IST were included. On MR images, the delaminated tears at the SST-IST, defined as an intratendinous horizontal splitting between the articular and bursal layers of the SST-IST and/or different degree of retraction between the two layers, were identified and classified into six types: articular-delaminated full-thickness tear, bursal-delaminated full-thickness tear, interstitial-delaminated full-thickness tear, articular-delaminated partial-thickness tear, bursal-delaminated partial-thickness tear and interstitial-delaminated partial-thickness tear. Other radiologic findings such as the presence of intramuscular cysts and footprint tears were evaluated. Based on the review of video records of 127 arthroscopic surgeries, the diagnostic accuracy of indirect MR imaging for the detection of the delaminated tears was determined.

On MR imaging, 56% (129/231) of shoulders with SST-IST tears had delaminated tears. Articular-delaminated full-thickness tears (n = 58) and articular-delaminated partial-thickness tears (n = 64) were the most common types. About 82% (36/44) of articular-delaminated full-thickness tears occurring at the SST were combined with articular-delaminated partial-thickness tears at the IST. SST-IST footprint tears and intramuscular cysts were significantly more common in the shoulders with delaminated tears (p = 0.007 and 0.01 respectively). The sensitivity and specificity of indirect MR arthrography for detection of delaminated tears were 93% and 95%, respectively.

On MR imaging, about half of the shoulders with SST-IST tears were combined with delaminated tears. The diagnostic accuracy of indirect MR arthrography for detection of delaminated tears was high.

On MR imaging, about half of the shoulders with SST-IST tears were combined with delaminated tears. The diagnostic accuracy of indirect MR arthrography for detection of delaminated tears was high.

Choo, H, Shin, G, Lee, S, Park, Y, Cho, Y, Choi, S, Delaminated Tears of the Rotator Cuff: Prevalence, Characteristics and Diagnostic Accuracy on Indirect MR Arthrograph .  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14012076.html