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The Volume of Subscapularis Muscle Remains Unaffected by Supraspinatus Tendon Tears: Three-dimensionally Reconstructed Magnetic Resonance Imaging Analysis
Clin Should Elbow 2019;22:03-08
Published online March 1, 2019;  https://doi.org/10.5397/cise.2019.22.1.3
© 2019 Korean Shoulder and Elbow Society.

Yong Cheol Jun, Young Lae Moon , Havinder Dev Bhardwaj1, Jae Hwan Lim, Dong Hyuk Cha

Department of Orthopedic Surgery, Chosun University School of Medicine, Gwangju, Korea, 1Department of Orthopedic Surgery, Punjab Institute of Medical Sciences, Jalandhar, Punjab, India
Correspondence to: Young Lae Moon
Department of Orthopedic Surgery, Chosun University Hospital, 365 Pilmun-daero, Dong-gu, Gwangju 61453, Korea
Tel: +82-62-220-3147, Fax: +82-62-226-3379, E-mail: orthoped@chosun.ac.kr, ORCID: https://orcid.org/0000-0002-4487-9884
IRB approval: Chosun University Hospital (No. CHOSUN 2015-11-003-002).
Received May 15, 2018; Revised October 21, 2018; Accepted November 5, 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: This study aimed to compare the subscapularis muscle volume between the intact groups (group I) and supraspinatus tendon tear groups (group T) based on the sex and three different age groups.
Methods: Subjects with a group I and subjects with group T without any other lesions were retrospectively evaluated from among patients who received a magnetic resonance imaging (MRI) scan between January 2011 and December 2013. The MRI scans were studied by a consultant radiologist. The subscapularis muscle volume was compared according to the age and sex; the age groups were categorized as patients in their 40s, 50s, and 60s. The volume of subscapularis muscle was measured by three-dimensional reconstructed images acquired through the axial section of 1.5T MRI.
Results: No statistically significant differences were observed between subscapularis muscle volume of the group I and group T, except for male patients in their 50s (group I: 100,650 mm3 vs. group T: 106,488 mm3) and 60s (group I: 76,347 mm3 vs. group T: 99,549 mm3) (p<0.05). Males had a larger mean volume of subscapularis muscle than females, and the subscapularis muscle volume decreased in a linear manner with increasing age.
Conclusions: Decrease in subscapularis muscle volume was observed with increasing age, and the impact of supraspinatus tear on subscapularis muscle volume is age and sex dependent.
Keywords : Rotator cuff tear; Muscle atrophy; Quantitative assessment