what is sacral torsion
n condition in which the sacrum rotates about an oblique axis so that sacral base side opposite to the axis involved glides anteriorly, producing a deep sulcus. torsion, left-on-left (forward) sacral, n condition in which left rotation of the sacrum occurs about a left oblique axis. torsion, left-on-right (backward) sacral, n condition in which left rotation occurs about a right oblique axis. torsion, right-on-left (backward) , n condition in which right rotation occurs about a left oblique axis.