Anterior rotation of the sacrum against the left and right ilia.
Compare: nutation
[counter- + nutation, fr. L. nuto, to nod]


n posterior movement of the sacrum around a transverse axis relative to the hip bones.
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References in periodicals archive ?
Counternutation represents sacral base movement posteroinferior in relation to the ilium [36,38], and is checked by the longitudinal fibers of the interosseous ligament [39].