RESUMO
Fifteen morphologically and structurally complete sacrum specimens of normotrophic adult females were choosen. Distances between posterior sacral foramina and median sacral crest,and between the cores of adjacent posterior sacral foramina were measured. Then statistical analysis was done so as to provide objective anatomical evidence for the surface localization of Baliao points. The average distance between Shangliao (BL 31) and median sacral crest was (2.08 ± 0.19) cm; and the average distance between Ciliao (BL 32) and median sacral crest was (1.75 ± 0.12) cm; Zhongliao (BL 33), (1.59 ± 0.15) cm; Xialiao (BL 34), (1.56 ± 0.15) cm. And the distance of S1-S2 was (2.36 ± 0.31) cm averagely; S2-S3, (1.98 ± 0.23) cm; S3-S4, (1.71 ± 0.18) cm. It is considered that to locate Baliao points, Ciliao (BL 32) needs to be ascertained firstly.