A female patient complains of progressively worsening low back pain. The pain is located at the lumbosacral junction. Two days ago, she vaginally delivered a 9lbs. 2 oz baby boy. On examination the seated flexion test is negative.
A. Left on left sacral torsion B. Bilateral sacral flexion C. Right innominate anterior D. Bilateral sacral extension E. Right inferior pubic shear
A bilateral sacral flexion occurs during the delivery phase of childbirth when the sacrum nutates (sacral base moves anteriorly) to allow more space for the fetus to pass through the pelvic outlet into the birth canal.