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The critical shoulder angle, the acromial index, the glenoid version angle and the acromial angulation are associated with rotator cuff tears

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To compare the critical shoulder angle (CSA), acromion index (AI), acromion angulation (AA) and glenoid version angle (GVA) between patients with full-thickness rotator cuff tears (RCTs) and patients with intact rotator cuffs.

Methods

Between 2014 and 2018, the CSA, AI, AA and GVA were measured in consecutively included patients aged > 40 years who underwent shoulder arthroscopy for full-thickness RCTs. A total of 437 patients with RCTs and a mean age of 51.2 years (± 5.8) were included, 35.7% of whom were male. In the control group, there were n = 433 patients (36.3% male) with an intact rotator cuff, and the mean age was 50.7 years (± 5.3).

Results

The mean AI for the RCT group was 0.7 ± 0.1, which was significantly higher than the mean AI for the control group (0.6 ± 0.1, p < 0.001). The mean CSA for the RCT group was 33.6° ± 3.9°, which was significantly higher than the mean CSA for the control group (31.5° ± 4°, p < 0.001). The mean AA for the RCT group was 13.9° ± 9°, which was significantly higher than the mean AA for the control group (12.4 ± 8.6, p = 0.012). The mean GVA for the RCT group was − 3.5° ± 4.6° and significantly retroverted compared with the mean GVA for the control group (− 2.2° ± 4.6°, p < 0.001). The cutoff values determined by the ROC curve analyses were as follows: 0.6 for AI, 31.4° for CSA, 9.6° for AA and − 2.6° for GVA.

Conclusion

The CSA, AI, GVA and AA values measured by MRI were determined to be significantly related to full-thickness rotator cuff ruptures. The AI, CSA, AA and GVA may be considered risk factors for degenerative rotator cuff tears. Assessing the CSA, AI, GVA and AA can be helpful for diagnostic evaluation of patients with full-thickness RCTs.

Level of evidence

III.

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Authors and Affiliations

  1. Department of Orthopedics, Karabuk Safranbolu State Hospital, Atatürk Mah. Sağlık Sok. No 42, 78600, Karabuk, Turkey

    Mustafa A. İncesoy

  2. Health Science University Baltalimani Bone Diseases Education and Research Hospital, Istanbul, Turkey

    Kadir İ. Yıldız, Özgür İ. Türk, Şuayip Akıncı, Emre Turgut, Osman E. Aycan & Ilhan A. Bayhan

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  1. Mustafa A. İncesoy
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  2. Kadir İ. Yıldız
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Correspondence to Mustafa A. İncesoy.

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The authors recieved no financial support for the reasearch.

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The study was conducted in accordence with the Decleration of Helsinki.

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İncesoy, M.A., Yıldız, K.İ., Türk, Ö.İ. et al. The critical shoulder angle, the acromial index, the glenoid version angle and the acromial angulation are associated with rotator cuff tears. Knee Surg Sports Traumatol Arthrosc 29, 2257–2263 (2021). https://doi.org/10.1007/s00167-020-06145-8

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