Abstract #4497

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

Lawrence L Buchan^1,2, Honglin Zhang^1,2, 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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