Skaggs D L, Kaminsky C, Tolo V T, Kay R M, Reynolds R A
Children's Hospital Los Angeles, University of Southern California School of Medicine, USA.
J Pediatr Orthop. 1998 Nov-Dec;18(6):799-801.
This study examined the variability in the measurement of the acetabular index (AI) in normal and dysplastic hips, both before and after reduction. This variability for dysplastic hips is greater than that of normal hips. The variability is greater before an open or closed reduction than after reduction, and the variability after an open reduction is nearly 3 times greater than after a closed reduction. The 95% confidence interval of the AI is 10.1 degrees intraobserver and 21.9 degrees interobserver for all hips. The AI is most accurate in the situation in which it is most useful, after a closed reduction of a dysplastic hip. A 95% confidence interval of 5.1 degrees in this selected population supports the use of the AI for monitoring acetabular remodeling after closed reductions in accordance with previous clinical recommendations.
本研究考察了正常髋关节和发育不良髋关节在复位前后髋臼指数（AI）测量的变异性。发育不良髋关节的这种变异性大于正常髋关节。开放或闭合复位前的变异性大于复位后，且开放复位后的变异性几乎是闭合复位后的3倍。所有髋关节AI的观察者内95%置信区间为10.1度，观察者间为21.9度。在发育不良髋关节闭合复位后这一最有用的情况下，AI最为准确。在这一选定人群中95%置信区间为5.1度，支持根据先前临床建议将AI用于监测闭合复位后的髋臼重塑。
