Abstract: ［Abstract］ Objective〖HTSS〗〓To compare the agreement and reliability of ulnar variance measurements on radiograph, computed tomography(CT), magnetic resonance imaging(MRI).
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Thirtytwo volunteers who underwent wrists posteroanterior and lateral Xray, Xray, CT and MRI were recruited. The differences in ulnar variance measured with different methods were evaluated with KruskalWallis H analysis of variances. Intraclass correlation coefficient(ICC) was used to assess the repeatability of seven methods, and agreement between raters and methods were compared using BlandAltman plots.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓There was no significant difference in ulnar variance measured by seven methods（P＞005）. Interrater and intrarater ICC were both using excellently in all 7 methods. The CT threedimensional reconstruction was outstanding in reliability and agreement.
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓PA radiography, lateral radiography, coronal CT multiplanar reconstruction, sagittal CT multiplanar reconstruction, CT threedimensional reconstruction, coronal MRI(bonebone)and coronal MRI(cartilagecartilage), all the methods mentioned above could be used in measuring the UV. CT 3D reconstruction method was the most reliable and consistent method for measuring UV, which was more accurate than other 6 methods for measuring UV.

Key words: ulna, genetic variation, magnetic resonance imaging