Assessment of inter- and intra-observer reliability in the determination of radiographic version and inclination of the cup in metal-on-metal hip resurfacing

作者：Reito Aleksi; Puolakka Timo; Paakkala Antti; Pajamaki Jorma^*

来源：International Orthopaedics, 2012, 36(3): 519-525.

DOI：10.1007/s00264-011-1328-1

Purpose Determination of the cup orientation after metal-on-metal hip resurfacing may provide important information in the postoperative follow-up. We present a mathematical method based on a previously described approach to assess the version and inclination of the cup in the metal-on-metal bearing without a separate software computation from plain radiographs. The aim of the study was to assess the intra-and inter-observer reliability of this method. %26lt;br%26gt;Methods Calculation of version and inclination were done twice for 20 hip resurfacings by four observers. Intraobserver reliability was estimated by mean error and correlation of the two sets of measurement for version and inclination. Bland-Altman plots, intra-class coefficient and mean error were used to assess the inter-observer reliability of the measurements. %26lt;br%26gt;Results Intra-observer correlation for version measurement ranged from 0.74 to 0.94. Correlation for inclination varied between 0.94 and 0.97. Upper and lower limits of agreement in Bland-Altman plots for version measurements between observers ranged from 4.1 to 7.2 degrees and from -3.2 to -8.3 degrees, respectively. For inclination measurements the upper and lower limits ranged from 3.1 to 5.3 degrees and from -2.7 to -6.0 degrees. %26lt;br%26gt;Conclusions Mean errors, correlation coefficients and 95% limits of agreement were on an acceptable level. We believe that this method is applicable for clinical use.

• 出版日期2012-3