Fig. 6.

Patient with adult scoliosis, PI 62°. SS of 35° compensating with PT 26°, SFP 59°. She underwent long lumbar fusion to pelvis with insufficient lordosis correction and residual postoperative mismatch (PI–LL 26°), and still compensating SS 34° and PT 27°, SFP 57°. Fused in pelvic retroversion, care must be taken not to put the cup in anteversion as it would be at risk of anterior dislocation.

Note. PI, pelvic incidence; SS, sacral slope; PT, pelvic tilt; SFP, sacro-femoral pubic angle; LL, lumbar lordosis.