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Abstract #4497

Open MRI of FAI: Reader agreement of a new method for quantifying femoroacetabular clearance for hips in an impingement posture

Lawrence L Buchan1,2, Honglin Zhang1,2, Mark Harmon3, Elaine Ni Mhurchu3, Morgan Barber4, Shannon Jennifer Patterson5, Jacek Kopec4, Hubert Wong6, John Esdaile4, Jolanda Cibere4, Charles R Ratzlaff4, Bruce B Forster3, and David R Wilson1

1Orthopaedics, University of British Columbia, Vancouver, BC, Canada, 2Centre for Hip Health and Mobility, Vancouver, BC, Canada, 3Radiology, University of British Columbia, Vancouver, BC, Canada, 4Arthritis Research Canada, Richmond, BC, Canada, 5Vancouver Coastal Health, Vancouver, BC, Canada, 6University of British Columbia, Vancouver, BC, Canada

In this study, we describe a novel open MRI method for evaluating femoroacetabular impingement (FAI) in subjects with and without symptomatic FAI. First, we acquired images of subjects in postures suspected of inducing impingement using a T1-weighted gradient echo MR sequence. Second, readers measured β-angle to quantify clearance between the femur and acetabulum. Reader agreement for β-angle was equivalent or better to agreement when measuring α-angle, a similar structural measure. The open MRI method has the potential to assess functional relationships between the femur and acetabulum that otherwise cannot be assessed with closed-bore MRI scanners and conventional imaging protocols. This approach may be useful in addressing fundamental questions in FAI.

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