结果显示平均WP/W为0.47 (95% CI, 0.45-0.49)。现存方法组（47.6°；95%CI，45.6-49.5°）和新方法组（60.0°；95%CI，58.7-61.3°）的平均骨盆旋转度有显著性差异（p<0.0001）。此外，与新方法组（SD=5.7，p=0.0035）相比，现存方法组（SD=7.9°）的测量值分布更广。
Assessing precision and accuracy of false-profile hip radiographs
Purpose: The purpose of this study was to assess the accuracy and precision of pelvic rotation in existing false-profile (FP) radiographs and to devise a method to improve accuracy and precision of FP radiographs.
Methods: An imaging protocol was developed to obtain FP radiographs. Pelvic rotation was calculated using the described method for FP images obtained in the 3 months prior to and after implementation of this protocol. Student's t-test and variance ratio tests were used to determine differences in mean and variance of pelvic rotation between the 2 cohorts. Pelvic rotation calculation methodology was validated by using fluoroscopic C-arm to obtain AP and rotated images of 10 osteologic pelvises. The ratio of the distance between hip centres of each rotated image and AP image (WP/W) was determined. Intraclass coefficient correlation (ICC) was used to verify the relationship between WP/W and pelvic rotation.
Results: Mean WP/W was 0.47 (95% CI, 0.45-0.49). There were significant differences in mean pelvic rotation of the pre-protocol group (47.6°; 95% CI, 45.6-49.5°) and the post-protocol group (60.0°; 95% CI, 58.7-61.3°, p < 0.0001). Additionally, there was a significantly wider distribution of measurements in the pre-protocol group (SD = 7.9°) compared to the post-protocol group (SD = 5.7°, p = 0.0035).
Conclusions: The quality of FP radiographs obtained in the clinical setting may be inconsistent. Standardising FP imaging produces more accurate images. Appropriate FP radiographs should have a distance between hip centres that is approximately 0.5 times the same distance found on an anteroposterior (AP) radiograph.
Ryan T Li , Mithun Neral , Heath Gould , Emily Hu , Raymond W Liu , Michael J Salata . Assessing precision and accuracy of false-profile hip radiographs. Hip Int. 2019 Sep 23:1120700019877848. doi: 10.1177/1120700019877848.