Femoral Torsion Measurement Using MRI with T1 VIBE Dixon Compared with Matched CT of Adult Femoroacetabular Impingement Patients

Purpose or Learning Objective: Femoroacetabular Impingement (FAI) is a known cause of hip pain in young patients. Femoral version (FV) is associated with extra-articular hip impingement. Measurement of FV with magnetic resonance imaging (MRI) is controversial. Knee bolstering is commonly used for MRI. We compared MRI- and computed tomography (CT)-based measurements of FV and asked this question: What is the reliability in terms of mean difference and correlation with and without bolstering, and also between two readers?