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- W3165123617 abstract "Background Excessive standing posterior pelvic tilt (PT), lumbar spine stiffness, low pelvic incidence (PI), and severe sagittal spinal deformity (SSD) have been linked to increased dislocation rates. We aimed to determine the prevalence of these 4 parameters in a cohort of unstable total hip arthroplasty (THA) patients and compare these to a large representative control population of primary THA patients. Methods Forty-eight patients with instability following primary THA were compared to a control cohort of 9414 THA patients. Lateral X-rays in standing and flexed-seated positions were used to assess PT and lumbar lordosis (LL). Computed tomography scans were used to measure PI and acetabular cup orientation. Thresholds for “at risk” spinopelvic parameters were standing posterior PT ≤ −15°, lumbar flexion (LLstand–LLseated) ≤ 20°, PI ≤ 41°, PI ≥ 70°, and SSD (PI–LLstand mismatch ≥ 20°). Results There were significant differences in mean spinopelvic parameters between the dislocating and control cohorts (P < .001). There were no differences in mean PI (58° versus 56°, respectively, P = .29) or prevalence of high and low PI between groups. 67% of the dislocating patients had one or more significant risk factors, compared to only 11% of the control. A total of 71% of the dislocating patients had cup orientations within the traditional safe zone. Conclusion Excessive standing posterior PT, low lumbar flexion, and a severe SSD are more prevalent in unstable THAs. Pre-op screening for these parameters combined with appropriate planning and implant selection may help identify at risk patients and reduce the prevalence of dislocation." @default.
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- W3165123617 date "2023-04-01" @default.
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- W3165123617 title "High Prevalence of Spinopelvic Risk Factors in Patients With Post-Operative Hip Dislocations" @default.
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- W3165123617 doi "https://doi.org/10.1016/j.arth.2022.05.016" @default.
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