base of sacrum

base of sa·crum

the upper end of the sacrum that articulates with the body of the fifth lumbar vertebra in the midline plus the superior aspects of the alae on either side.
Synonym(s): basis ossis sacri [TA]
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Nakipoglu et al (2008) [19] have measured sacral horizontal angle (SHA) between the base of sacrum and the horizontal plane.
BS: base of sacrum; SCL: sacrococcygeal ligament; SH: sacral hiatus.