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

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Multiple Choice

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

Explanation:
Sacral flexion (nutation) happens when the sacral base tilts anteriorly as you bend forward. This movement is coupled with lumbar flexion: as you flex the trunk, the lumbar spine moves into flexion and the pelvis tilts forward, allowing the sacrum to nutate. So, when the sacrum is in flexion, the lumbar spine is also flexing. Conversely, lumbar extension produces sacral counternutation (posterior tilt).

Sacral flexion (nutation) happens when the sacral base tilts anteriorly as you bend forward. This movement is coupled with lumbar flexion: as you flex the trunk, the lumbar spine moves into flexion and the pelvis tilts forward, allowing the sacrum to nutate. So, when the sacrum is in flexion, the lumbar spine is also flexing. Conversely, lumbar extension produces sacral counternutation (posterior tilt).

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