Acetabular labral tear description and measures of pincer and cam-type femoroacetabular impingement and interobserver variability on 3 T MR arthrograms


      • There is fair interrater agreement for acetabular labral tears and extent.
      • There is fair to excellent agreement for measures of femoroacetabular impingement.
      • Agreement is worse for measures of cam than to pincer morphology.



      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.


      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).


      There is moderate inter-observer variability reporting labral tears and measures of FAI.


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