TEXT SIZE

search for



Another Assessment of Fat Degeneration of Retracted Supraspinatus Muscle
Clinics in Shoulder and Elbow 2018;21:200-206
Published online December 1, 2018
© 2018 Korean Shoulder and Elbow Society.

Yeon-Seok Jeong, Jae-Kwang Yum, Sang-Yoon Park

Department of Orthopaedic Surgery, Sanggye Paik Hospital, Inje University School of Medicine, Seoul, Korea
Correspondence to: Jae-Kwang Yum
Department of Orthopaedic Surgery, Inje University Sanggye Paik Hospital, 1342 Dongil-ro, Nowon-gu, Seoul 01757, Korea
Tel: +82-2-950-1027, Fax: +82-2-950-1429, E-mail: Yumccf@hanmail.net, ORCID: https://orcid.org/0000-0002-0286-7981
IRB approval: Inje University Sanggye Paik Hospital (SGPAIK 2018-08-030).
Received August 27, 2018; Revised October 5, 2018; Accepted October 9, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Background: The purpose of this study was to assess the relevance of preoperative magnetic resonance imaging (MRI) evaluation by occupation ratio (OR) at maximum diameter of supraspinatus muscle. Methods: Patients from the Inje University Sanggye Paik Hospital who received rotator cuff repair and underwent pre- and postoperative MRI were selected as subjects of this study. On T1-weighted MRIs, OR of fat and muscle at Y-shaped view, OR at a location on supraspinatus muscle where its diameter was maximum on coronal view, and pre- and postoperative Goutallier Classification and changes in the tangent sign were measured. Statistical significance of postoperative OR was assessed regarding time from symptom onset to surgery, size of rotator cuff tear, preoperative OR, and the difference between ORs measured at maximum diameter of supraspinatus muscle and Y-shaped view. 
Results: Preoperative OR at Y-shaped view was 52.28 짹 8.57 (32.5–65.3). Preoperative OR difference between maximum diameter and Y-shaped view was 13.76 짹 10.51 (2.38–42.04), and Pearson correlation coefficient was 0.604 (p=0.001). Postoperative OR at Y-shaped view was 63.77 짹 9.35 (37.3–76.1). Pearson correlation coefficient of pre- and postoperative Goutallier Classification was -0.579 (p=0.002) and Pearson correlation coefficient of the postoperative difference between ORs measured at maximum diameter of supraspinatus muscle and Y-shaped view was -0.386 (p=0.047).
Conclusions: Fatty degeneration of supraspinatus muscle in rotator cuff tear patients should be evaluated not only in the conventional Y-shaped view, but also at location of maximum diameter of supraspinatus muscle to establish patients therapeutic plan.
Keywords : Rotator cuff tears; Supraspinatus muscle; Occupation ratio; Retraction; Fat degneration