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Mathematical modeling of normal sagittal spinal alignment.
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Objective measures of the hip flexor moment provide information on the mechanical reorientation of the acetabulum and the possibility of normal sagittal-plane kinetics of the hip.
We have provided reference intervals for normal sagittal rotation and translation for both of these approaches, and have estimated the prevalence of LSR and LSI for both definitions in a mainly primary care RCLBP population.
Early designs, such as the Harrington rod, corrected coronal deformity but failed to account for normal sagittal alignment.
These include changes to overall gait pattern characterised by reduced walking velocity and shortened step and stride length [16] altered load and pressure distribution characteristic of both high-arch and flat-foot posture [8]; disturbance of the normal sagittal rocker function [17,30]; and muscle imbalance and reduced muscle strength [7,30].
Patient had minimal pelvic obliquity, 5.4 cm of coronal imbalance, and normal sagittal parameters.
Normal sagittal alignment of the spine is determined by pelvic geometric parameters.
Correcting rotational deformity and maintaining the normal sagittal profile of the spine is more important than only correcting coronal deformity [ 3, 4].
Some studies investigated the amount of normal spinal sagittal curves [ 7– 9] while others evaluated alignment, morphology and pelvic parameters in children [ 6, 10– 13].
Infusion studies predict a normal sagittal sinus pressure in hydrocephalus (7 mmHg) but the estimation of the sinus pressure based on flow and area of the sinuses suggests 10.2 mmHg or 3.2mmHgg higher.
Many attempts have been made to quantify normal sagittal spinal alignment and lordosis using a C7 plumb line and segmental angulations of the spinal vertebrae.
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