Rectus abdominis stabilizes the pelvis and lumbar spine to prevent what?

Rectus abdominis stabilizes the pelvis and lumbar spine to prevent what?

• A. Posterior pelvic tilt and thoracic kyphosis
• B. Knee valgus torque
• C. Excessive ankle dorsiflexion
• D. Excessive anterior pelvic rotation and lumbar lordosis

Answer: (D)

The key idea is how the rectus abdominis helps control pelvic position to keep the lower back stable. When the pelvis tilts forward (anterior rotation), the lumbar spine tends to increase its curve (lumbar lordosis). The rectus abdominis, by pulling the pelvis toward a posterior tilt and helping flex the trunk, counteracts that forward tilt. This keeps the lumbar spine from overextending and maintains a safer, more neutral alignment during movements. Its role isn’t about the knee, ankle, or thoracic spine in this context, but about preventing excessive anterior pelvic rotation and the accompanying lumbar lordosis.

The key idea is how the rectus abdominis helps control pelvic position to keep the lower back stable. When the pelvis tilts forward (anterior rotation), the lumbar spine tends to increase its curve (lumbar lordosis). The rectus abdominis, by pulling the pelvis toward a posterior tilt and helping flex the trunk, counteracts that forward tilt. This keeps the lumbar spine from overextending and maintains a safer, more neutral alignment during movements. Its role isn’t about the knee, ankle, or thoracic spine in this context, but about preventing excessive anterior pelvic rotation and the accompanying lumbar lordosis.