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Magnetic resonance imaging of femoral head development in roentgenographically normal patients
Authors:Peter J Littrup MD  Alex M Aisen MD  Ethan M Braunstein MD  William Martel MD
Institution:(1) University of Michigan Medical School, Ann Arbor, Michigan, USA;(2) Department of Radiology, University Hospital, 48109 Ann Arbor, MI, USA
Abstract:Magnetic resonance images (MRI) of 22 patients with roentgenographically normal hips were reviewed retrospectively and the findings categorized according to age. With increasing maturity, the MR intensity of the femoral heads on spin echo images increased, as marrow fat became a dominant tissue in the head. The femoral head pattern was relatively inhomogeneous, with a broad band of diminished intensity extending in a posteromedial to anterolateral direction, corresponding to the pattern of trabecular bone. The femoral capital epiphyses were visible in younger patients as structures of bright intensity which remained evident through early adulthood. The articular cartilage of the hip joint was noted as a distinctive ldquohalordquo around the femoral head. An understanding of the MR pattern of the normal hip will aid in the early recognition of pathologic conditions, such as osteonecrosis.
Keywords:Magnetic resonance images  Femoral head  Trabecular bone patterns  Articular cartilage  Epiphyses
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