Spine
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This study's design was a cross-cultural validation of the Neck Disability Index (NDI) and Neck Pain and Disability Scale (NPDS). ⋯ The Chinese versions of the NDI and the NPDS are reliable and valid instruments to measure functional status in Chinese-speaking patients with neck pain in China. They are simple and easy to use, and can now be applied in clinical settings and future outcome studies in China and other Chinese-speaking communities.
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In vitro biotribological investigation. ⋯ The experimental wear rates compare well with the reported wear rates of other material combinations used in nucleus replacement and total disc arthroplasty. Overall, wear rates were relatively low and consistent, suggesting long-term durability, a critical requirement of disc arthroplasty devices.
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Comparative Study
Lumbar spine flexion and extension extremes of motion in women of different age and racial groups: the WIN Study.
Observational. ⋯ Normative values of lumbar extension are different for white and African-American women. Values for lumbar flexion and extension are different between age groups. Different criteria should be used to estimate impairment level in women of different racial and age groups.
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Comparative Study
Morphometric comparisons between the pedicle and the pedicle rib unit in the immature Chinese thoracic spine: a computed tomographic assessment.
Morphology comparisons between the pedicle and pedicle rib unit in the immature spine were conducted through computed tomographic scans. ⋯ Compared with the dimensions of the immature pedicle, the significantly larger size of the corresponding pedicle rib unit provides a more ample space, which accommodates screws with larger diameters. Extrapedicular vertebral body fixation was anatomically feasible for the immature spine. The new procedure should be cautiously applied to avoid potential implant failures or a new deformity because of the growth of the immature spine.
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Radiologic evaluation of computed tomography (CT) scans using screw insertion simulation software. ⋯ Although there was no significant difference in success rates between AL and PL points, PL is likely the best entry point. Although 30 degrees medial and approximately 5 degrees upward angulation led to the highest rate of successful screw placement, the rate was only around 80%. Given the wide individual variation, we recommend that a preoperative 3-dimensional CT scan be obtained when attempting atlantooccipital transarticular screw fixation.