Lumbosacral Motion
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When the lumbar spine moves into extension, the sacrum responds with symmetric (bilateral) flexion (anterior nutation). If the extended lumbar spine then side bends to the left with coupled rotation to the right, the sacrum will:
When the lumbar spine moves into extension followed by right side bending with coupled rotation to the left, the sacrum will:
When the lumbar spine moves into flexion, the sacrum responds with symmetric (bilateral) extension (posterior nutation). If the flexed lumbar spine then side bends to the left with coupled rotation to the left, the sacrum will:
With lumbar flexion followed by right side bending with coupled rotation to the right, the sacrum will:
In the absence of dysfunction, with the lumbar spine in the neutral position, L5 will move in a direction opposite to the direction that the sacrum is moving.