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Related Experiment Videos

Milwaukee shoulder: correlating possible etiologic variables.

John Antoniou1, Albert Tsai, Dan Baker

  • 1Department of Orthopaedic Surgery, University of California-San Diego, San Diego, CA, USA.

Clinical Orthopaedics and Related Research
|February 5, 2003
PubMed
Summary
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Apatite crystals in joint fluid correlate with larger rotator cuff tears and arthritis. Elevated prostaglandin E levels were observed in patients with these crystals, suggesting a link to inflammation and disease progression.

Area of Science:

  • Orthopedics
  • Rheumatology
  • Biochemistry

Background:

  • Rotator cuff tears can lead to debilitating cuff tear arthropathy.
  • The role of intra-articular inflammation, specifically from apatite crystals, in this process is not fully understood.

Purpose of the Study:

  • To evaluate the correlation between apatite crystal-induced inflammation and rotator cuff deficiency in the development of cuff tear arthropathy.
  • To investigate the relationship between crystal presence, tear size, and glenohumeral arthritis.

Main Methods:

  • Retrospective evaluation of 37 patients with full-thickness rotator cuff tears.
  • Analysis of synovial fluid for apatite crystals (alizarin red stain), leukocyte count, prostaglandin E, and matrix metalloproteinase.
  • Intraoperative or MRI quantification of rotator cuff tear size.

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Main Results:

  • Significantly higher levels of prostaglandin E were found in synovial fluid of patients with apatite crystals.
  • Elevated crystal levels were significantly associated with larger rotator cuff tears and glenohumeral arthritis.

Conclusions:

  • Apatite crystals are linked to increased inflammation (prostaglandin E) and are more prevalent in patients with significant rotator cuff tears and arthritis.
  • These findings may help elucidate the etiology and guide treatment strategies for cuff tear arthropathy.