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Effect of the Spine on Implant Positioning and Hip Stability in Total Hip Arthroplasty
Key Points The normal stand-to-sit postural change is 20 degrees of posterior pelvic tilt and 55 to 70 degrees of femur flexion—not 90 degrees of hip flexion. Stand-to-sit mobility involves two hinges: the posterior hinge is the lumbosacral junction (sacral…