Pelvic incidence: a fixed value or can you change it?

There has been renewed interest in the pelvic vertebrae by spinal surgeons recently. Those involved in working with patients with adult spinal deformity, focus on the position of the fused spine as it relates to the pelvis, and determine success or failure by specific numbers for given pelvic parameters. The pelvic parameters that are commonly measured for these patients are pelvic tilt, sacral slope, and pelvic incidence. Out of the three, pelvic incidence has always been considered to be the fixed measurement, while pelvic tilt and sacral slope have the capacity to change in relation to external forces.

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