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Higher critical shoulder angle (CSA) measurements are linked to rotator cuff tears (RCTs). This systematic review found that increased CSA correlates with the severity of rotator cuff involvement, suggesting it

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanical Engineering

Background:

  • Rotator cuff tears (RCTs) have complex, multifactorial causes.
  • The critical shoulder angle (CSA), measuring acromial extension, is a proposed extrinsic risk factor for RCTs.

Purpose of the Study:

  • To systematically review and meta-analyze the literature on the association between rotator cuff tears and critical shoulder angle.

Main Methods:

  • Systematic review and meta-analysis conducted following PRISMA guidelines.
  • Searched PubMed, Ovid, and Cochrane Reviews databases.
  • Assessed methodological quality using the MINORS SCORE.

Main Results:

  • Included 28 studies with 2110 patients with full-thickness RCT and 2972 controls.
  • Average CSA was 36.7° in full-thickness RCT patients vs. 33.1° in controls.
  • CSA values increased with RCT severity: 34.6° (partial), 38.1° (massive).

Conclusions:

  • Significantly higher CSA values were observed in patients with rotator cuff tears compared to asymptomatic individuals.
  • Critical shoulder angle appears to correlate with the severity of rotator cuff involvement.