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Muscle Edema of Retraction and Pseudo Fatty Infiltration After Traumatic Rotator Cuff Tears as an Experimental Model in Sheep

Muscle Edema of Retraction and Pseudo Fatty Infiltration After Traumatic Rotator Cuff Tears as an Experimental Model in Sheep

Tiago Martinho, MD, SWITZERLAND Joe Chih-Hao Chiu, MD, PhD, TAIWAN Marko Nabergoj, MD, SLOVENIA Sean W.L. Ho, MBBS, MRCS, MMed (Ortho), FRCS (Ortho), SINGAPORE Hugo Bothorel, MEng, SWITZERLAND Alexandre Lädermann, MD, SWITZERLAND

La Tour Hospital, Meyrin, SWITZERLAND


2023 Congress   ePoster Presentation   2023 Congress   Not yet rated

 

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Diagnosis / Condition

Treatment / Technique

Diagnosis Method

Sports Medicine


Summary: Edema can be related to musculotendinous retraction and appear hours following a traumatic rotator cuff tear. The location of this edema is often peripheral or intra-muscular. Edema of retraction presents as a characteristic muscle ground glass appearance in T1 weighted sequences.


Introduction

The purpose of this study was aimed to describe the characteristics of a type of edema associated with acute retraction of the rotator cuff tear (termed as edema of retraction), and to highlight the risk of mistaken it with pseudo fatty infiltration of the cuff muscle.

Methods

Fourteen alpine sheep were used for analysis. The contralateral limb was used as a control. Surgical osteotomy of the greater tuberosity osteotomy was performed to result in a release of the infraspinatus tendon. MRI scans were performed immediately after surgery and at 2- and 4-weeks post-surgery. T1 and T2 weighted, and DIXON pure fat sequences were reviewed for hyperintense signals.

Results

The edema of retraction results in hypersignals within the retracted cuff muscles on both T1 and T2 weighted images but there is an absence of hypersignal seen on DIXON pure-fat sequences. This represents pseudo fatty infiltration. The edema of retraction creates a characteristic muscle ground glass appearance on T1 weighted sequences and is often found in either peri- or intra-muscular location of the rotator cuff muscle.

Conclusion

Edema can be related to musculotendinous retraction and appear hours following a traumatic rotator cuff tear. The location of this edema is often peripheral or intra-muscular. Edema of retraction presents as a characteristic muscle ground glass appearance in T1 weighted sequences.


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