Influence of Sacrum during gait cycle….

Walking is influenced by the ability of the sacrum to torsion left on the left axis and right on the right axis.

Sacral torsional movement is considered to occur around an oblique axis.  the left oblique axis runs from the upper extremity of the left sacroiliac joint to the lower end of the right sacroiliac joint, and the right oblique axis runs from the upper end of the right sacroiliac joint to the lower extremity of the left sacroiliac joint.

Clinical observation of the normal walking cycle demonstrates that sacral side-bending and rotation couple to opposite sides.  This is also known as ‘Type 1 motion’.

‘Type 2 motion’ is coupling to the same side.

left torsion on the left oblique axis, the sacrum rotates left and side-bends right, with the right sacral base moving into anterior nutation.

right torsion on the right oblique axis, the sacrum rotates right and side-bends left, with the left sacral base moving into anterior nutation.

Because the nutational component of this normal walking movement is anterior in direction, left torsion on the left oblique axis  and right torsion on the right oblique axis are described as anterior torsional movements.

The exact biomechanics of the torsional movements of the sacrum are still unknown,  The nutational movement in normal walking is anterior on one sidereturn to neutral, and vice versa.

How sacrum moves during gait cycle?

Right heel strike, the right innominate has rotated in a posterior direction and the left innominate has rotated in an anterior direction. The anterior surface of the sacrum is rotated to the

 

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