Fig. 8.

(A) Female, 75 years old, with degenerative lumbar spine PI 30°, SS 15° and SFP 70° and primary osteoarthritis of the right hip; she underwent primary THA. (B) Three-year postoperative radiograph showing an SS increase of 10° and pelvic anteversion gaining. Clinical result in terms of pain, function and mobility was excellent. (C) Seven years after primary THA, SFP decreased due to degenerative lordosis loss with associated pelvic retroversion and two anterior hip dislocations occurred, requiring hip revision surgery with a dual mobility cup.

Note. PI, pelvic incidence; SS, sacral slope; SFP, sacro-femoral pubic angle; THA, total hip replacement.