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First published on April 16, 2004, doi:10.1177/0363546503259348
This version was published on June 1, 2004
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The American Journal of Sports Medicine 32:962-966 (2004)
© 2004 American Orthopaedic Society for Sports Medicine

Mobile Superior Glenoid Labrum

A Normal Variant or Pathologic Condition?

Philip A. Davidson, MD*,{dagger},{ddagger} and Dennis W. Rivenburgh, PA-C, ATC{dagger}

From {dagger} Tampa Bay Orthopaedic Specialists, St. Petersburg, Florida, and the {ddagger} Division of Orthopedic Surgery, University of South Florida School of Medicine, St. Petersburgh, Florida

* Address correspondence to Philip A. Davidson, MD, 6500 66th Street North, St. Petersburg, FL 33781.

Background: Arthroscopic differentiation between a pathologic superior labrum anterior posterior lesion and a normal anatomic variant may be difficult.

Hypothesis: Various anatomic patterns exist that systematically characterize superior biceps–labral configurations. One variant involves a mobile superior labrum with exposed articular cartilage on the superior glenoid tubercle. The authors seek to demonstrate that this is nonpathologic.

Study Design: A prospective, consecutive descriptive anatomic study with 1-year clinical follow-up of a subgroup with an identified mobile superior labrum.

Methods: A total of 191 consecutive patients were prospectively evaluated arthroscopically to quantify the dimensions of the labrum and articular cartilage on the supraglenoid tubercle.

Results: A subgroup of 49 patients was identified with articular cartilage on the supraglenoid tubercle, a mobile labrum, and no fibrous tearing or evident injury in this region. In postoperative follow-up, only 1 (2.0%) of these patients was clinically symptomatic in the region of the superior labrum-biceps origin.

Conclusions: Indication for repair of a mobile superior glenoid labrum must be carefully addressed in the context of normal anatomic morphologic variability. The labral and supraglenoid tubercle morphology was noted to be highly variable.

Clinical Relevance: Patients with mobile labral tissue overlying intact articular cartilage, and no evidence of trauma, are not candidates for repair.

Key Words: labrum • morphology • supraglenoid tubercle • variability • superior labrum anterior and posterior (SLAP) lesion




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