If the lumbar spine is in flexion, what is the sacrum doing?

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Multiple Choice

If the lumbar spine is in flexion, what is the sacrum doing?

Explanation:
When the lumbar spine flexes, the pelvis and sacrum move together in a coordinated way. The sacrum tends to tilt backward, which is described here as extension of the sacrum (posterior tilt). This posterior tilt helps accommodate forward bending while keeping the pelvic ring aligned and stable. So, the sacrum is doing extension.

When the lumbar spine flexes, the pelvis and sacrum move together in a coordinated way. The sacrum tends to tilt backward, which is described here as extension of the sacrum (posterior tilt). This posterior tilt helps accommodate forward bending while keeping the pelvic ring aligned and stable. So, the sacrum is doing extension.

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