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The myth of the equiangular triangle for identification of sacral hiatus in children disproved by ultrasonography
Journal article   Peer reviewed

The myth of the equiangular triangle for identification of sacral hiatus in children disproved by ultrasonography

Min-Soo Kim, Kyung-Hwa Han, Eun Mi Kim, Seung Ho Jeong and Jeong-Rim Lee
Regional anesthesia and pain medicine, Vol.38(3), pp.243-247
05/01/2013
DOI: 10.1097/AAP.0b013e31828e8a1a
PMID: 23558373
url
https://ir.ymlib.yonsei.ac.kr/handle/22282913/87387View
Open Access

Abstract

A triangle formed by the sacral hiatus and posterior superior iliac spines (PSISs) has been known as equiangular and has been proposed as a way to help identify the sacral hiatus for a caudal block. In children, however, no feasibility study of this triangle has been performed. We compared the expected sacral hiatus obtained from the equiangular triangle method and the real sacral hiatus confirmed by ultrasound. Eighty children (aged 0.5-72 months) were placed in the left lateral decubitus position in full hip flexion. The vertex of an equiangular triangle formed inferior to PSISs was considered as the expected sacral hiatus by classic bony landmarks. The real sacral hiatus was identified by ultrasound. The angle formed by the 2 lines connecting each PSIS and the real sacral hiatus (angle θ) was also measured. The distances between the midpoint of PSISs and expected sacral hiatus (distance E) and real sacral hiatus (distance R) were measured and compared. The angle θ was greater than 60 degrees in all children (79.3 [9.3] degrees) and negatively correlated with age younger than 1 year. Distance R (3.5 [1.1] cm) was significantly shorter than distance E (4.9 [1.2] cm) (P< 0.001). The distance R positively correlated with age, weight, height, and the distance between the PSISs. In children, using the equiangular triangle to identify the sacral hiatus may be inappropriate because the actual triangle formed by the sacral hiatus and PSISs is not equiangular.
Anesthesia, Caudal - methods Child Child, Preschool Female Humans Infant Male Regression Analysis Sacrum - anatomy & histology Sacrum - diagnostic imaging Ultrasonography, Interventional

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