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Semin Musculoskelet Radiol 2013; 17(03): 248-257
DOI: 10.1055/s-0033-1348091
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Imaging of the Acetabular Labrum

James D. Thomas
1   Department of Radiology, Leeds Teaching Hospitals, Leeds, United Kingdom
,
Zhi Li
2   Division of Anatomy, Department of Surgery, University of Toronto, Ontario, Canada
,
Anne M. Agur
2   Division of Anatomy, Department of Surgery, University of Toronto, Ontario, Canada
,
Philip Robinson
1   Department of Radiology, Leeds Teaching Hospitals, Leeds, United Kingdom
3   University of Leeds, Leeds Musculoskeletal Biomedical Research Unit, Chapel Allerton Hospital, Leeds, United Kingdom
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Publikationsdatum:
20. Juni 2013 (online)

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Abstract

The evaluation and proposed relevance of acetabular labral tears has rapidly evolved over the last decade due to the recognition of femoroacetabular impingement, an increase in the number of surgical options, and improved imaging of the hip with MR arthrography and 3-T MR protocols. The acetabular labrum, stabilizing the hip joint, provides a seal, enhancing fluid lubrication, maintains synovial pressure, and prevents direct contact of the articular surfaces. The labrum takes on a weightbearing role at the extremes of motion with excessive forces seen in a great number of athletic activities thought to contribute to tearing. Approximately 25% of labral tears are not associated with any specific injury or traumatic event with the underlying etiology thought to be repetitive microtrauma. This article reviews the anatomy of the acetabular labrum and discusses the five most commonly occurring etiologies of labral tears: trauma, femoroacetabular impingement, hip hypermobility, dysplasia, and degeneration. We also review the surgical and MR classification of labral tears and describe potential pitfalls in image interpretation.

Keywords

hip - MRI - MR arthrography - labrum
 

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