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Infraspinatus muscle atrophy: implications?

Lawrence Yao1, Uday Mehta

  • 1Department of Radiology, National Institutes of Health, Bldg 10, Rm 1C640, 10 Center Dr, Bethesda, MD 20892-1182, USA. yaolawrence@yahoo.com

Radiology
|January 4, 2003
PubMed
Summary

Infraspinatus muscle atrophy on shoulder MRI often indicates anterior rotator cuff tears. However, isolated infraspinatus atrophy does not necessarily mean the infraspinatus tendon is torn.

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Area of Science:

  • Orthopedic imaging
  • Musculoskeletal radiology

Background:

  • Infraspinatus muscle atrophy is an abnormality noted on shoulder magnetic resonance (MR) imaging.
  • Understanding associated findings is crucial for accurate diagnosis and patient management.

Purpose of the Study:

  • To evaluate associated findings in patients with infraspinatus muscle atrophy on shoulder MR examinations.
  • To clarify the implications of infraspinatus muscle atrophy.

Main Methods:

  • Retrospective review of shoulder MR examinations over a 1-year period.
  • Identification of cases with advanced infraspinatus muscle atrophy.
  • Tabulation of associated MR imaging findings by a single reader using a standardized method.

Main Results:

  • Advanced infraspinatus muscle atrophy was found in 4.3% of 1,191 shoulder MR exams.
  • Infraspinatus tendon tears were present in 53% of cases; anterior rotator cuff tears were present in 90%.
  • Isolated infraspinatus muscle atrophy occurred in 20% of cases, and in 17% despite an intact tendon.

Conclusions:

  • Infraspinatus muscle atrophy commonly accompanies anterior rotator cuff tears.
  • While supraspinatus atrophy may be present, isolated infraspinatus atrophy does not confirm an infraspinatus tendon rupture.

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