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Updated: May 27, 2026

Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears
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Published on: May 9, 2025

Subacromial impingement syndrome.

Alicia K Harrison1, Evan L Flatow

  • 1Department of Orthopaedic Surgery, University of Minnesota Medical School, MN, USA.

The Journal of the American Academy of Orthopaedic Surgeons
|November 5, 2011
PubMed
Summary
This summary is machine-generated.

Subacromial impingement syndrome (SIS) involves shoulder pain from various rotator cuff issues. Further research is needed to clarify its causes and best treatments, including physical therapy, injections, and surgery.

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Shoulder Surgery

Background:

  • Subacromial impingement syndrome (SIS) encompasses a range of shoulder pathologies, including subacromial bursitis, rotator cuff tendinopathy, and full-thickness rotator cuff tears.
  • The exact relationship between subacromial impingement and rotator cuff disease in the development of rotator cuff injuries is not fully understood.
  • Potential contributing factors include both extrinsic compression and intrinsic degenerative processes.

Purpose of the Study:

  • To review the current understanding of subacromial impingement syndrome (SIS).
  • To discuss the debated etiology of rotator cuff injury in relation to SIS.
  • To outline current management strategies and identify the need for further research.

Main Methods:

  • Literature review of studies on subacromial impingement syndrome.
  • Analysis of the proposed mechanisms for rotator cuff pathology.
  • Summary of existing treatment modalities for SIS.

Main Results:

  • SIS is a complex condition with a spectrum of underlying pathologies affecting the rotator cuff.
  • Both external impingement and internal tendon degeneration are considered potential causes of rotator cuff disease.
  • Current management options for SIS include conservative treatments like physical therapy and injections, as well as surgical interventions.

Conclusions:

  • Subacromial impingement syndrome is a significant cause of shoulder pain with diverse underlying pathologies.
  • High-quality research is essential to elucidate the precise etiology and optimize management strategies for SIS.
  • Further investigation into the interplay between impingement and rotator cuff degeneration is warranted.