Anterior rotation of the sacrum against the left and right ilia.
Compare: nutation
[counter- + nutation, fr. L. nuto, to nod]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Symmetrical motion involves nutation and counternutation. Nutation denotes sacral base translation anteroinferiorly on the ilium [36,38], and is checked by the sacrotuberous and sacrospinous ligaments (e.g., in weight-bearing, anatomic position) [36].