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The Demographic and Morphological Features of Rotator Cuff Disease

A Comparison of Asymptomatic and Symptomatic Shoulders

¹ Shoulder and Elbow Service, Departments of Orthopaedic Surgery (K.Y., K.D., and L.M.G.) and Diagnostic Radiology, MIR Institute of Radiology (W.D.M., C.F.H., and S.A.T.), Barnes-Jewish Hospital, Washington University School of Medicine, One Barnes Hospital Plaza, Suite 11300 West Pavilion, St. Louis, MO 63110

Investigation performed at the Department of Orthopaedic Surgery and the Department of Diagnostic Radiology, MIR Institute of Radiology, Barnes-Jewish Hospital, Washington University School of Medicine, St. Louis, Missouri

A commentary is available with the electronic versions of this article, on our web site (www.jbjs.org) and on our quarterly CD-ROM (call our subscription department, at 781-449-9780, to order the CD-ROM).

In support of their research for or preparation of this manuscript, one or more of the authors received grants or outside funding from the Orthopaedic Research and Education Foundation CDA. None of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Methods: Five hundred and eighty-eight consecutive patients in whom a standardized ultrasonographic study had been performed by an experienced radiologist for the assessment of unilateral shoulder pain were evaluated with regard to the presence and size of rotator cuff tears in each shoulder. The demographic factors that were analyzed included age, gender, side, and cuff thickness. All of these factors were evaluated with regard to their correlation with the presence of pain.

Results: Of the 588 consecutive patients who met the inclusion criteria, 212 had an intact rotator cuff bilaterally, 199 had a unilateral rotator cuff tear (either partial or full thickness), and 177 had a bilateral tear (either partial or full thickness). The presence of rotator cuff disease was highly correlated with age. The average age was 48.7 years for patients with no rotator cuff tear, 58.7 years for those with a unilateral tear, and 67.8 years for those with a bilateral tear. Logistic regression analysis indicated a 50% likelihood of a bilateral tear after the age of sixty-six years (p < 0.01). In patients with a bilateral rotator cuff tear in whom one tear was symptomatic and the other tear was asymptomatic, the symptomatic tear was significantly larger (p < 0.01). The average size of a symptomatic tear was 30% greater than that of an asymptomatic tear. Overall, patients who presented with a full-thickness symptomatic tear had a 35.5% prevalence of a full-thickness tear on the contralateral side.

Conclusions: There is a high correlation between the onset of rotator cuff tears (either partial or full thickness) and increasing age. Bilateral rotator cuff disease, either symptomatic or asymptomatic, is common in patients who present with unilateral symptomatic disease. As the size of a tear appears to be an important factor in the development of symptoms, we recommend surveillance at yearly intervals for patients with known rotator cuff tears that are treated nonoperatively.

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