Shalev E, Feldman E, Weiner E, Zuckerman H
Acta Obstet Gynecol Scand. 1985;64(1):71-4. doi: 10.3109/00016348509154691.
The effectiveness of ultrasonic femur length measurement from 12 to 40 week's gestation, as a means of assessing fetal age, was tested and compared with that of biparietal cephalometry. The femur length and biparietal diameter (BPD) were obtained from 471 measurements, from pregnant women with confirmed datings, using real-time scanning with a 3,5 mHz transducer frequency. Using a freeze frame and electronic calipers, the mean value of three consecutive measurements of the femur, when visualized with its characteristic appearance, was recorded. Linear regression analysis with the correlation coefficient of the femur growth-curve (r = 0.989, p less than 0.001) and that of the BPD (r = 0.985, p less than 0.001) showed that the former is as good as the latter. The femur growth-curve from 12 to 40 week's gestation with a mean +/- 2 SD was constructed. Estimation of fetal age by femur length measurement was compared with that assessed by the BPD in a further 54 women. A close correlation was found (r = 0.993, p less than 0.001). Measurement of the fetal femur appears to be a reliable method for assessing gestational age, which can compensate for the limitations of the BPD method.
对孕12至40周超声测量股骨长度作为评估胎儿年龄的一种方法的有效性进行了测试，并与双顶径测量法进行了比较。使用3.5兆赫兹换能器频率的实时扫描，从471例有确定孕周的孕妇测量中获取股骨长度和双顶径（BPD）。使用定格和电子卡尺，当股骨呈现其特征性外观时，记录连续三次测量的平均值。股骨生长曲线（r = 0.989，p < 0.001）和BPD生长曲线（r = 0.985，p < 0.001）的线性回归分析表明，前者与后者一样好。构建了孕12至40周的股骨生长曲线，其均值±2标准差。在另外54名女性中，将通过股骨长度测量估计的胎儿年龄与通过BPD评估的胎儿年龄进行了比较。发现两者密切相关（r = 0.993，p < 0.001）。测量胎儿股骨似乎是评估孕周的一种可靠方法，它可以弥补BPD方法的局限性。
