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Analysis of Greater Tuberosity from the Center of the Humeral Head: Progression to Femoralization
Clin Should Elbow 2019;22:216-219
Published online December 1, 2019;  https://doi.org/10.5397/cise.2019.22.4.216
© 2019 Korean Shoulder and Elbow Society.

Jun-Seok Lee, Hyun Seok Song , Hyungsuk Kim, Hyung Moon Yoon, Sung Bin Han

Department of Orthopedic Surgery, Eunpyeong St. Mary셲 Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
Correspondence to: Hyun Seok Song
Department of Orthopedic Surgery, Eunpyeong St. Mary셲 Hospital, College of Medicine, The Catholic University of Korea, 1021 Tongil-ro, Eunpyeong-gu, Seoul 03312, Korea
Tel: +82-2-2030-4628, Fax: +82-2-2030-4629, E-mail: hssongmd@hanmail.net, ORCID: https://orcid.org/0000-0002-7844-2293
IRB approval: The Catholic University of Korea, St. Paul셲 Hospital (No. PC10OISI0026).
Received November 22, 2019; Revised November 25, 2019; Accepted November 26, 2019.
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: Progression of the tear size and erosion of the greater tuberosity (femoralization) in the supraspinatus tear makes it difficult to repair or increases the risk of a re-tear. This study examined the proximal articular surface and greater tuberosity of the humeral head in plain radiography.
Methods: Two-hundred forty-seven cases, whose anteroposterior (AP) radiographs were taken correctly, were included from 288 cases, in whom the status of the supraspinatus had been confirmed by surgery. After downloading the plain AP radiograph as DICOM, the radius of the circle apposed at the superior half of the articular surface of the head, and the distance between the circle and the farthest point of the greater tuberosity (쁥eight of the greater tuberosity) were calculated using the software (TechHime, Korea). MRI checked the number of torn tendons and degree of muscular atrophy.
Results: The following were encountered: 93 intact supraspinatus, 50 partial-thickness tears, and 104 full-thickness tears. In the analysis using the 93 intact cases, the average radius of the rotation center was 25.3 mm in male and 22.3 mm in female. The average height of the greater tuberosity from the circle with the same rotation center was 4.3 mm in male and 4.2 mm in female with no statistical significance. The correlation between the reparability of supraspinatus and height of the greater tuberosity, fatty infiltration, and muscular atrophy was confirmed.
Conclusions: The height of the greater tuberosity from the circle with the same rotation center was 4.3 mm in male and 4.2 mm in female. This height was strongly correlated with muscular atrophy and fatty infiltration of the supraspinatus tendon.
Keywords : Supraspinatus tear; Height; Grater tuberosity; Femoralization; Muscular Atrophy