Abstract
Background
Although morphometric hip parameters measured on radiographs are valuable tools guiding diagnosis and therapy in patients with hip disorders, some clinicians use MRI for such measurements, although it is unclear whether the parameters assessed on MRI differ from those assessed on radiographs.
Questions/purposes
We asked whether the lateral center-edge angle (LCE), Tönnis angle, extrusion index, and anterior center-edge angle (ACE) are similar on MRI and radiography.
Methods
We retrospectively reviewed the imaging data of 103 hips from 103 patients: 46 with femoroacetabular impingement and 57 with hip dysplasia. We manually measured the LCE, Tönnis angle, extrusion index, and ACE from radiographs and MRI in all 103 hips. Four straight coronal (Ant-10 mm, Ant-5 mm, Center, and Post-5 mm), three straight sagittal (S-Med-5 mm, S-Center, S-Lat-5 mm), and three 25º oblique sagittal (OS-Med-5 mm, OS-Center, OS-Lat-5 mm) reformats were reconstructed from a three-dimensional isotropic morphologic MRI sequence. MRI measurements were compared against the gold standard radiographic measurements.
Results
We found good agreement for the LCE angle, Tönnis angle, and extrusion index between radiographic and coronal slice MRI measurements. The mean differences between radiographic and MRI measurements were 5º or less or 5% or less (for the extrusion index) in all coronal MRI slices. However, the differences between ACE angles on sagittal MRI slices and radiographs ranged from 5° to 28º.
Conclusions
LCE, Tönnis angle, and extrusion index can be measured on MRI with comparable results to radiography. The ACE angle on radiographs cannot be estimated reliably from MRI.
Clinical Relevance
MRI provides similar morphometric measurements as radiography for most hip parameters, except for the ACE angle.
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Acknowledgments
We thank Catherine Stamoulis PhD, for help with the statistics and Kerri Murray and Jeffrey Tsang for help with database research.
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The institution of one of the authors (Y-JK) received research funding from Siemens Healthcare and the Orthopaedic Research and Education Foundation.
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
Each author certifies that his or her institution approved or waived approval for the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.
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Stelzeneder, D., Hingsammer, A., Bixby, S.D. et al. Can Radiographic Morphometric Parameters for the Hip Be Assessed on MRI?. Clin Orthop Relat Res 471, 989–999 (2013). https://doi.org/10.1007/s11999-012-2654-3
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DOI: https://doi.org/10.1007/s11999-012-2654-3