Fig. 5.

(A) Initially this patient had a lumbar lordosis of 57°, and SS of 37°, being PI 52°, her PT was 15°. Due to degenerative discopathy she underwent an L2–S1 posterior fusion and central decompression. (B) Two years after that she underwent a right-side THA. (C) After some years, an adjacent segment degeneration occurred, LL decreased to 24°, PT increased to 24° (pelvic retroversion) and SFP decreased to 62° (cup anteversion), and the patient suffered an anterior THA dislocation.

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