Spine
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Cross-sectional baseline data set on the sagittal standing posture of 1196 adolescents. ⋯ The orientation of gross body segments with respect to the gravity line seems superior to local spinopelvic features in terms of clinical importance, at least in the current pre-PHV cohort. Opportunities may exist for postural subgrouping strategies to begin with global alignment parameters in order to gain further insight into the relationship between sagittal alignment and the relative risk of developing spinal pain/seeking medical consultation for this pain.
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Comparative Study
Racial differences in the incidence of acute low back pain in United States military service members.
An epidemiological study. ⋯ Race, sex, and age were all found to be significant risk factors for acute low back pain. The highest rates were identified in blacks followed by whites, Hispanics, and American Indian/Alaskan Native, and the lowest rates were identified in Asians/Pacific Islanders. Significant differences in the effect of sex and age were identified between the different racial groups.
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A risk factor analysis study. ⋯ Both LIV selection and ratio of MT: TL/L curve were found to be highly correlated with the onset of postoperative trunk shift in Lenke 1C scoliosis. Amount of correction obtained by surgery, however, did not seem to be an independent causative factor. Postoperative trunk shift is less likely to occur when selecting LEV as LIV and the ratio of MT: TL/L Cobb angle of 1.2° or more.
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A retrospective study was conducted to investigate the impact of vertebral endplate cyst formation on union status after lumbar interbody fusion. ⋯ These findings show a relationship between vertebral endplate cyst formation in the early postoperative period and nonunion after lumbar interbody fusion. Endplate cyst formation is a useful early predictor of subsequent nonunion.
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A finite element analysis. ⋯ In models of 1-segment lumbar fusion surgery, the positions of pedicle screws were closely linked with corresponding disc stresses and facet contact forces. However, even in cases of facet violation by pedicle screws, removal of the pedicle screw after fusion completion can reduce facet contract forces and disc stresses under both extension and torsional moments.