2023 ISAKOS Biennial Congress ePoster
Muscle Edema of Retraction and Pseudo Fatty Infiltration After Traumatic Rotator Cuff Tears as an Experimental Model in Sheep
Tiago Martinho, MD, Meyrin, Geneve SWITZERLAND
Chih-Hao Chiu, MD, PhD, Gueishan District, Taoyuan City TAIWAN
Marko Nabergoj, MD, Ankaran SLOVENIA
Sean W.L. Ho, MBBS, MRCS, MMed (Ortho), FRCS (Ortho), Singapore, Singapore SINGAPORE
Hugo Bothorel, MEng, Meyrin SWITZERLAND
Alexandre Lädermann, MD, Meyrin, Geneva SWITZERLAND
La Tour Hospital, Meyrin, SWITZERLAND
FDA Status Not Applicable
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.
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Abstract
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.