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Perthes Lesion (A Variant of the Bankart Lesion)

MR Imaging and MR Arthrographic Findings with Surgical Correlation

¹ Department of Radiology, University of California San Francisco, 505 Parnassus Ave., San Francisco, CA 94143-0628.
² Present address: Department of Diagnostic Radiology, Kantonsspital, University of Basle, Petersgraben 4, CH-4031 Basle, Switzerland.
³ National Orthopaedic Imaging Associates, 1260 S. Eliseo Dr., Greenbrae, CA 94904.
⁴ California Pacific Orthopedic and Sports Medicine, 3838 California St., Ste. 715, San Francisco, CA 94118.

OBJECTIVE. The aim of this study was to evaluate the use of MR imaging in the characterization of the Perthes lesion by correlating MR findings with findings at arthroscopy.

CONCLUSION. The use of a combination of axial and abduction—external rotation position sequences on MR images can be helpful in the diagnosis of a Perthes lesion. A fluid-filled joint with capsular distension, caused by either a large amount of effusion or MR arthrography, was found to be helpful in outlining Perthes lesions. Adding the abduction—external rotation position to the protocol in patients in whom Perthes lesion is suspected will increase diagnostic accuracy and may reveal a Perthes lesion not visible on axial images, as was the case in 50% of the patients in our series.

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