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The supraspinatus occupation ratios of both the ≥ 50% articular- and bursal-side partial-thickness rotator cuff tears were low and the infraspinatus occupation ratio of the ≥ 50% bursal-side partial-thickness rotator cuff tears was low

Knee Surgery, Sports Traumatology, Arthroscopy volume 27, pages 3871–3880 (2019)Cite this article

Abstract

Purpose

The purpose of this study was to analyze the relationship between the occupation ratio and partial-thickness rotator cuff tears.

Methods

The study included and retrospectively investigated 683 patients with partial-thickness rotator cuff tears between 2013 and 2017. Fifty patients with impingement syndrome were also enrolled as the control group for normal-population comparison. The participants were divided into five groups: Group A, control group; Group B, < 50% articular-side tears; Group C, ≥ 50% articular-side tears; Group D, < 50% bursal-side tears; and Group E, ≥ 50% bursal-side tears. Muscle volume was evaluated by measurement of each occupation ratio of the supraspinatus and infraspinatus tendons on the most lateral view of the T1-weighted oblique-sagittal images in which the scapular spine remained in contact with the scapular body.

Results

Fifty patients were enrolled in Group A. A total of 683 patients with Partial thickness rotator cuff tear were divided and classified into the following groups: 272 into Group B, 153 into Group C, 161 into Group D, and 97 into Group E. The supraspinatus occupation ratios of all partial-thickness rotator cuff tear groups were significantly lower than those of the control group. Furthermore, the supraspinatus occupation ratios of Groups C and E (≥ 50% partial-thickness rotator cuff tears) were significantly lower than those of Groups B and D (< 50% partial-thickness rotator cuff tears). However, the infraspinatus occupation ratio of only Group E was significantly lower than that of the other groups.

Conclusion

The supraspinatus occupation ratios of both the ≥ 50% articular- and bursal-side partial-thickness rotator cuff tears were lower than those of the other partial-thickness rotator cuff tears. Conversely, the infraspinatus occupation ratio of only the ≥ 50% bursal-side partial-thickness rotator cuff tears was low.

Level of evidence

IV.

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Affiliations

  1. Department of Orthopaedic Surgery, Dankook University College of Medicine, Manghyangro 201, Dongnam-gu, 330-715, Cheonan, Chungnam, Republic of Korea

    Jae-Sung Yoo, Kang Heo, Seung-Gwan Park, Hee-Jung Ham & Joong-Bae Seo

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  1. Jae-Sung Yoo
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  2. Kang Heo
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  3. Seung-Gwan Park
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  4. Hee-Jung Ham
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  5. Joong-Bae Seo
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Correspondence to Joong-Bae Seo.

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All procedures performed in studies involving human participants were in accordance with the ethical standard of the institutional research committee with the 1964 Helsinki declaration.

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Yoo, JS., Heo, K., Park, SG. et al. The supraspinatus occupation ratios of both the ≥ 50% articular- and bursal-side partial-thickness rotator cuff tears were low and the infraspinatus occupation ratio of the ≥ 50% bursal-side partial-thickness rotator cuff tears was low. Knee Surg Sports Traumatol Arthrosc 27, 3871–3880 (2019). https://doi.org/10.1007/s00167-019-05419-0

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Keywords

  • Rotator cuff
  • Magnetic resonance imaging
  • Rotator cuff tear
  • Occupation ratio
  • Muscle volume
  • Muscle hypotrophy