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A New Predictive Parameter for Rotator Cuff Tears: Acromial Incidence Angle.

Haluk Yaka1, Mustafa Özer1, Ulunay Kanatli2

  • 1Department of Orthopaedics & Traumatology, Necmettin Erbakan University School of Medicine, Konya, Turkey.

Orthopaedic Journal of Sports Medicine
|April 29, 2025
PubMed
Summary

The acromial incidence angle (AIA) is a novel predictor of rotator cuff tears (RCT), especially when combined with the critical shoulder angle (CSA). This study found AIA to be highly sensitive and specific in identifying RCT risk.

Keywords:
acromial incidence angleacromial morphologyanterior acromial coveragecritical shoulder anglerotator cuff tear

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Increased critical shoulder angle (CSA) is associated with rotator cuff tears (RCT), but its predictive value is limited by wide distribution.
  • Evaluating CSA with acromial morphology in the sagittal plane may improve RCT prediction.

Purpose of the Study:

  • To investigate the association between acromial incidence angle (AIA) and RCT.
  • To determine if combining AIA and CSA enhances RCT risk prediction.

Main Methods:

  • A cross-sectional study comparing 117 RCT patients with 117 controls.
  • Measurement of CSA, AIA, glenoid inclination, glenoid version, and anterior acromial coverage via MRI.
  • Statistical comparison of parameters between groups and logistic regression analysis.

Main Results:

  • Mean CSA and AIA were significantly higher in the RCT group (P=.009 and P<.001, respectively).
  • AIA demonstrated high sensitivity (80.2%) and specificity (83.9%) for RCT prediction.
  • Combined CSA and AIA analysis improved prediction, particularly in patients with lower CSA values.

Conclusions:

  • AIA is a significant, independent predictor of RCT.
  • The combination of AIA and CSA offers a more accurate assessment of RCT risk, especially for individuals previously considered low-risk based on CSA alone.