PART 1: Illustrations 9: Sacrum Compared to...
The sacrum is compared to a cone
The sacrum is compared to a cone, with the articular surfaces curling around it. This configuration allows the large anterior-posterior motions of gait to transfer through the innominates, get geared down to the sacrum, curl around the sacrum, and pull the sacrum in a rotary motion, with components of lateral bending and flexion-extension, which then travels up the spine.
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