If L5 is rotated right, what is the sacrum doing?

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Multiple Choice

If L5 is rotated right, what is the sacrum doing?

Explanation:
Motion at the lumbosacral junction links lumbar rotation to sacral motion, and they tend to rotate in opposite directions to preserve pelvic and sacroiliac joint alignment. When L5 rotates to the right, the sacrum rotates to the left to maintain congruence at the sacroiliac joints. It isn’t stationary, and it isn’t simply flexing in response—the opposite rotation is the natural coupling pattern in this region.

Motion at the lumbosacral junction links lumbar rotation to sacral motion, and they tend to rotate in opposite directions to preserve pelvic and sacroiliac joint alignment. When L5 rotates to the right, the sacrum rotates to the left to maintain congruence at the sacroiliac joints. It isn’t stationary, and it isn’t simply flexing in response—the opposite rotation is the natural coupling pattern in this region.

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