Purpose: To evaluate the inter-rater agreement for description of labral tears and measures of femoroacetabular impingement (FAI) on 3 T hip MR arthrography.
Materials and methods: 53 hip MR arthrograms were reviewed by three musculoskeletal radiologists. Labral tears were described (Czerny classification) with extents recorded. Cam- and pincer-type FAI measures were performed. Intraclass correlation (ICC) and kappa statistic (κ) assessed inter-observer agreement.
Results: There was fair agreement for labral tear description (κ = 0.25-0.39) and for alpha angles (ICC = 0.54), and fair to excellent agreement for other measures of FAI (ICC = 0.51-0.90).
Conclusion: There is moderate inter-observer variability reporting labral tears and measures of FAI.
Keywords: Acetabular labral tear; Femoroacetabular impingement; Hip; Interobserver variability; Magnetic resonance arthrography.
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