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1 Department of Radiology, Walter Reed Army Medical Center, 6900 Georgia Ave.,
NW, Washington, DC 20307-5001.
2 Department of Radiology and Nuclear Medicine, Uniformed Services, University
of the Health Sciences, 4301 Jones Bridge Rd., Bethesda, MD 20814.
3 Department of Orthopedic Surgery, Walter Reed Army Medical Center, Washington,
DC 20307-5001.
4 Department of Radiologic Pathology, Armed Forces Institute of Pathology,
Washington, DC 20306-6000.
OBJECTIVE. Our study correlated findings on hip MRI and MR arthrography with hip arthroscopy to assess the location, prevalence, and potential pitfall of a normal acetabular sublabral sulcus.
MATERIALS AND METHODS. We retrospectively collected 58 hip MRI studies along with surgical reports in 58 patients who underwent hip arthroscopy over a 5-year period. Intraoperative photography (n = 23), radiography (n = 56), unenhanced MRI (n = 13), and MR arthrography (n = 54) studies were available for review. Two radiologists described hip anatomy on radiology studies with agreement by consensus.
RESULTS. A normal posteroinferior sublabral groove was confirmed on available arthroscopy photographs in four (17.4%) of 23 hips. In each of these four patients, the anatomic sublabral groove correlated with apparent partial labral detachment on MR arthrography. On review of all studies, 13 hips (22.4%) without a posterior labral tear at surgery had imaging findings of a sublabral sulcus. The sulcus was not associated with acetabular dysplasia, which was radiographically noted in 12 cases (21.4%). Preoperatively, the sulcus was misdiagnosed as a tear in two cases. Labral tears were anterior or anterosuperior in 51 patients.
CONCLUSION. A posteroinferior sublabral groove is a relatively common normal anatomic hip variation. If not recognized as normal, the sulcus may serve as a diagnostic pitfall on MR arthrography. Its location is distinct from most labral tears. We did not discover a sublabral sulcus at the anterior or anterosuperior acetabulum, the most common sites of labral injury.
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