Can Radiographic Morphometric Parameters for the Hip Be Assessed on MRI?

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 centeredge 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 258 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 58 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 288. 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.

Bony abnormalities of the hip joint: a new comprehensive, reliable and radiation-free measurement method using magnetic resonance imaging

“…Among experienced raters, our findings were similar to previously published studies reporting the reliability of FV, (24,25,27) LCEA (28) and AV (29) measurements using MRI. Ours is the first to report the reliability of FNA.…”

Hip joint biomechanics during gait in people with and without symptomatic femoroacetabular impingement

“…Control participants underwent a standard hip MRI with a 3-Tesla MR scanner (Siemens Magnetom Triotim syngo MR B17) and a 16-channel body coil (coupled with a Siemens Spine array) to ensure they did not have morphological FAI. The alpha angle was measured on the oblique sagittal plane MRI [22,23]; the coronal plane was used to measure the lateral centre edge angle A c c e p t e d M a n u s c r i p t 9 (CEA). Where required, the localizer sequence was used to correct for pelvic obliquity [22].…”

“…The alpha angle was measured on the oblique sagittal plane MRI [22,23]; the coronal plane was used to measure the lateral centre edge angle A c c e p t e d M a n u s c r i p t 9 (CEA). Where required, the localizer sequence was used to correct for pelvic obliquity [22].…”

Response to Comment on Mittal et al: Defining the lateral edge of the femoroacetabular articulation: Correlation analysis between radiographs and computed tomography

“…The future will move toward MRI clarification of the true acetabular rim as reported by Stelzeneder et al 2 and others. We look forward to continuing developments in this exciting field.…”