base of sacrum

base of sa·crum

[TA]
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]
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References in periodicals archive ?
Nakipoglu et al (2008) [19] have measured sacral horizontal angle (SHA) between the base of sacrum and the horizontal plane.