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Changes in spinopelvic indices after hip arthroplasty and its influence on acetabular component orientation
Siddharth Mahesh Shah1, Selin Munir1, William Lindsay Walter1
1Specialist Orthopaedic Group, Mater Misericordiae Hospital, 25 Rocklands Road, North Sydney, NSW 2060, Australia.
Objective:
To evaluate spinopelvic changes after hip arthroplasty in standing and ready-to-rise positions.
Methods:
We compared pelvic tilt, sacral slope, cobb's angle, and hip flexion on pre and postoperative spinopelvic radiographs.
Results:
Standing: All postoperative indices were similar to preoperative ones except sacral slope (mean difference:1.6°, p = 0.046). Ready-to-rise: All postoperative indices were similar to preoperative ones except pelvic tilt which was significantly greater postoperatively (mean difference: 5.1°, p = 0.017). Fifteen patients showed >10° increase in pelvic tilt postoperatively.
Conclusion:
Changes in pelvic tilt in ready-to-rise position can predispose to posterior edge loading, edge wear, and dislocation; especially with inadequate cup anteversion.
