Which condition is least supportive of a BP sacrum?

• A. Hyperlordosis
• B. Hypolordosis
• C. SI fixation
• D. Scoliosis

Answer: (B)

A healthy balance of sagittal curves and pelvic tilt is what keeps the sacrum properly positioned to bear and transfer body weight. The lumbar spine’s lordosis creates the forward tilt of the pelvis and a sacral base angle that align the pelvis and spine for stable load transfer. When the lumbar curve is flattened (hypolordosis), the pelvis loses that anterior tilt, the sacral base angle decreases, and the sacrum sits in a less stable position. That diminished alignment makes the sacrum less capable of providing solid support under typical spinal loading, so this condition is least supportive of a BP sacrum.

Hyperlordosis, SI fixation, and scoliosis each alter mechanics in different ways, but they don’t inherently remove the basic sagittal alignment that helps position and stabilize the sacrum; they can be associated with other compensations, yet the sacrum remains more effectively supported than with a flattened lumbar curve.