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Incidence of teres minor muscle atrophy in young and middle-aged populations
BACKGROUND: Teres minor atrophy can be seen in shoulders both with and without a rotator cuff tear, even among the young population. The purpose of this study was to retrospectively investigate the incidence of teres minor atrophy in young and middle-aged patients with or without a rotator cuff tear...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9091733/ https://www.ncbi.nlm.nih.gov/pubmed/35572432 http://dx.doi.org/10.1016/j.jseint.2022.01.003 |
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author | Takeuchi, Yasutaka Sugaya, Hiroyuki Takahashi, Norimasa Matsuki, Keisuke Tokai, Morihito Morioka, Takeshi Ueda, Yusuke Hoshika, Shota Kawashima, Itaru |
author_facet | Takeuchi, Yasutaka Sugaya, Hiroyuki Takahashi, Norimasa Matsuki, Keisuke Tokai, Morihito Morioka, Takeshi Ueda, Yusuke Hoshika, Shota Kawashima, Itaru |
author_sort | Takeuchi, Yasutaka |
collection | PubMed |
description | BACKGROUND: Teres minor atrophy can be seen in shoulders both with and without a rotator cuff tear, even among the young population. The purpose of this study was to retrospectively investigate the incidence of teres minor atrophy in young and middle-aged patients with or without a rotator cuff tear. METHODS: Patient records were reviewed to identify 10-39-year-old patients (Group Y) and 60-69-year-old patients (Group O) who underwent MRI because of shoulder disorders. The exclusion criteria were as follows: (1) prior surgeries, (2) neurological disorders in the cervical spines or shoulder girdle, (3) global atrophy of all four cuff muscles without a rotator cuff tear, (4) acute trauma, and (5) poor image quality due to artifacts. An experienced shoulder surgeon evaluated teres minor atrophy on T1-weighted oblique sagittal images. Statistical analysis was performed using the chi-square test for comparison of Groups Y and O. RESULTS: Group Y consisted of 528 shoulders in 520 patients, including 406 males and 114 females with a mean age of 26 years. Group O consisted of 884 shoulders in 837 patients, including 394 males and 443 females with a mean age of 65 years. Rotator cuff tears were seen in 33 shoulders (6.3 %) in Group Y, and 411 shoulders (46.5%) in Group O. Teres minor atrophy was more present in Group O (59 shoulders [6.7%]) than Group Y (11 shoulders [2.1%], P < .001). Among shoulders with teres minor atrophy, the incidence of intact cuff tended to be higher in Group Y than O (7 shoulders [64%] and 21 shoulders [36%], P = .08). However, the ratio of the intact cuff to the number of patients in each group was not significantly different (Group Y, 7 of 528 [1.3%]; Group O, 21 of 884 [2.3%]). Teres minor muscle atrophy tended to be more common in athletes than nonathletes in Group Y, although the difference was not significant (P = .057). CONCLUSION: The incidence of teres minor atrophy was significantly higher in middle-aged patients than young patients. Middle-aged patients with teres minor atrophy were more associated with rotator cuff tears. The common cause of teres minor atrophy may be rotator cuff tears. Teres minor atrophy in young patients might be associated with sports-related factors such as infraspinatus hypertrophy or axillary nerve injury. |
format | Online Article Text |
id | pubmed-9091733 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-90917332022-05-12 Incidence of teres minor muscle atrophy in young and middle-aged populations Takeuchi, Yasutaka Sugaya, Hiroyuki Takahashi, Norimasa Matsuki, Keisuke Tokai, Morihito Morioka, Takeshi Ueda, Yusuke Hoshika, Shota Kawashima, Itaru JSES Int Shoulder BACKGROUND: Teres minor atrophy can be seen in shoulders both with and without a rotator cuff tear, even among the young population. The purpose of this study was to retrospectively investigate the incidence of teres minor atrophy in young and middle-aged patients with or without a rotator cuff tear. METHODS: Patient records were reviewed to identify 10-39-year-old patients (Group Y) and 60-69-year-old patients (Group O) who underwent MRI because of shoulder disorders. The exclusion criteria were as follows: (1) prior surgeries, (2) neurological disorders in the cervical spines or shoulder girdle, (3) global atrophy of all four cuff muscles without a rotator cuff tear, (4) acute trauma, and (5) poor image quality due to artifacts. An experienced shoulder surgeon evaluated teres minor atrophy on T1-weighted oblique sagittal images. Statistical analysis was performed using the chi-square test for comparison of Groups Y and O. RESULTS: Group Y consisted of 528 shoulders in 520 patients, including 406 males and 114 females with a mean age of 26 years. Group O consisted of 884 shoulders in 837 patients, including 394 males and 443 females with a mean age of 65 years. Rotator cuff tears were seen in 33 shoulders (6.3 %) in Group Y, and 411 shoulders (46.5%) in Group O. Teres minor atrophy was more present in Group O (59 shoulders [6.7%]) than Group Y (11 shoulders [2.1%], P < .001). Among shoulders with teres minor atrophy, the incidence of intact cuff tended to be higher in Group Y than O (7 shoulders [64%] and 21 shoulders [36%], P = .08). However, the ratio of the intact cuff to the number of patients in each group was not significantly different (Group Y, 7 of 528 [1.3%]; Group O, 21 of 884 [2.3%]). Teres minor muscle atrophy tended to be more common in athletes than nonathletes in Group Y, although the difference was not significant (P = .057). CONCLUSION: The incidence of teres minor atrophy was significantly higher in middle-aged patients than young patients. Middle-aged patients with teres minor atrophy were more associated with rotator cuff tears. The common cause of teres minor atrophy may be rotator cuff tears. Teres minor atrophy in young patients might be associated with sports-related factors such as infraspinatus hypertrophy or axillary nerve injury. Elsevier 2022-02-04 /pmc/articles/PMC9091733/ /pubmed/35572432 http://dx.doi.org/10.1016/j.jseint.2022.01.003 Text en © 2022 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Shoulder Takeuchi, Yasutaka Sugaya, Hiroyuki Takahashi, Norimasa Matsuki, Keisuke Tokai, Morihito Morioka, Takeshi Ueda, Yusuke Hoshika, Shota Kawashima, Itaru Incidence of teres minor muscle atrophy in young and middle-aged populations |
title | Incidence of teres minor muscle atrophy in young and middle-aged populations |
title_full | Incidence of teres minor muscle atrophy in young and middle-aged populations |
title_fullStr | Incidence of teres minor muscle atrophy in young and middle-aged populations |
title_full_unstemmed | Incidence of teres minor muscle atrophy in young and middle-aged populations |
title_short | Incidence of teres minor muscle atrophy in young and middle-aged populations |
title_sort | incidence of teres minor muscle atrophy in young and middle-aged populations |
topic | Shoulder |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9091733/ https://www.ncbi.nlm.nih.gov/pubmed/35572432 http://dx.doi.org/10.1016/j.jseint.2022.01.003 |
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