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Table 1 The reference pelvic planes used for preoperative planning

From: Preoperative planning for implant placement with consideration of pelvic tilt in total hip arthroplasty: postoperative efficacy evaluation

1. Anterior tilt group (preoperative standing APP > 10°): Reference, standing APP −10° 9 hips
2. Intermediate group (−10° < preoperative standing APP ≤ 10°): Reference, supine APP 45 hips
3. Posterior tilt group (preoperative standing APP ≤ −10°) 21 hips
 LLA > 30°: 11 hips; reference, supine APP  
 LLA ≤ 30°: 10 hips; reference, the midpoint between the supine and standing APPs  
  1. APP anterior pelvic plane, LLA lumbolordotic angle