Centre of gravity forces at SIJ

Question 1

Coronal plane

Answer 1

• Both right + left ASIS should be level
• Weight passes through centre of sacrum

Question 2

Sagittal plane

Answer 2

• ASIS (ant) nearly level with PSIS (post)
• ASIS higher than PSIS = post pelvic tilt
• ASIS lower than PSIS = ant pelvic tilt