Lumbosacral Junction

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

• Apophyseal joints oriented closer to the frontal plane.
• Base of sacrum inclined ~40° anteriorly/inferiorly
• Large amount of shear forces at L5-S1 resisted by:
  • Orientation of the articular facets.
  • ALL & iliolumbar ligaments resist shear.
• Shear forces increase with increased sacral inclination:
  • Structure of sacrum
  • Anterior pelvic tilt