Modified head-neck offset for diagnosing anterior femoro-acetabular impingement

Abstract

The new HNO is easier to measure, more reproducible and more accurate. A modified HNO <5 mm and a modified AOR <0.100 on the frog-leg view argued in favour of a pathological cam-type head-neck junction.

The Reliability of Commonly Used Radiographic Parameters in the Evaluation of the Pre-Arthritic Hip

“…3. Selection of radiographs for reproducibility calculations should be via randomization or from a consecutive series of patients so as to minimize selection bias 23,31,34,35,43,44,46,53,54,56,60,62 12 (27.9%) 4. Review of radiographs at different time points for intrarater reliability tabulation should be separated by a minimum of 1 week [23][24][25][29][30][31][33][34][35][36]39,[41][42][43][44]46,52,54,55,[59][60][61][62][63]65,67 26 (81.3%)* 5. Order of images at the time of second viewing for the intrarater reliability tabulation should be randomized with respect to the initial order of viewing 23,25,29,31,[33][34][35]67 8 (25.0%)* 6.…”

“…Order of images at the time of second viewing for the intrarater reliability tabulation should be randomized with respect to the initial order of viewing 23,25,29,31,[33][34][35]67 8 (25.0%)* 6. Reviewers operate independently of one another, blinded to the measurements/grades of other study participants 29,30,[32][33][34][35]37,39,41,[43][44][45][50][51][52]54,57,[60][61][62]64,66,67 23 (53.5%)…”

“…11. In the assessment of intraobserver reliability, more than a single rater ought to continue on to make the repeat set of measurements 23,24,[29][30][31][33][34][35][36][37][38][39]41,43,46,49,53,54,[58][59][60]62,63,66 24 (75.0%)* *Thirty-two of the 43 studies assessed intrarater reliability; thus, the percentage is based on a denominator of 32. †Twenty-four of the 43 studies assessed reliability with multiple reviewers at multiple time points; thus, the percentage is based on a denominator of 24.…”