What is the lumbar-pelvis/hip relationship in lumbar flexion?

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Multiple Choice

What is the lumbar-pelvis/hip relationship in lumbar flexion?

When you bend forward, the spine flexes but the pelvis and hips coordinate to allow that motion. The pelvis rotates into a posterior tilt (counter-nutation), which helps the lumbar spine flex while protecting the lower back from excess shear. At the same time, the hip joints flex to bring the thighs toward the trunk and continue the forward reach. An anterior pelvic tilt (nutation) or hip extension would oppose forward bending, so they don’t describe lumbar flexion.

When you bend forward, the spine flexes but the pelvis and hips coordinate to allow that motion. The pelvis rotates into a posterior tilt (counter-nutation), which helps the lumbar spine flex while protecting the lower back from excess shear. At the same time, the hip joints flex to bring the thighs toward the trunk and continue the forward reach. An anterior pelvic tilt (nutation) or hip extension would oppose forward bending, so they don’t describe lumbar flexion.

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