Spine
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Segmental motion and bone-implant interface stresses were analyzed at C5-C6 levels with Bryan, Prestige LP, and ProDisc-C cervical disc prostheses using an image-based finite element modeling technique. ⋯ Rigidity of the cores ("nuclei") in Prestige LP and ProDisc-C prostheses guarantee initial maintenance of disc height, but high contact stress takes place at the bone-end plate interface if they are improperly placed or undersized. Anchorage designs add an additional factor that may increase propensity of subsidence, indicated by the high contact stress occurring at the end plate flanges of Prestige LP, and at midline keel fixation on the end plate of ProDisc-C. Although Bryan disc differs in these 2 concerns, it also creates much larger displacement during motion with more variation in disc height that may theoretically increase the load sharing of facet and/or uncovertebral joints compared to more rigid artificial discs.
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A retrospective study on patients with chronic nonspecific low back pain (NSLBP). ⋯ Patients with NSLBP treated with the novel biomechanical device for 3 months increased walking speed through longer step length and eliminated asymmetrical differences.
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An anatomic, osteologic study of spina bifida occulta (SBO). ⋯ SBO has an overall prevalence of 12.4% in a large, diverse population. SBO is more common in men and whites and decreases in prevalence with increasing age. The STA is greater in SBO when compared with controls and an increased STA predicts SBO. In SBO, the STA decreases with increasing age.
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Retrospective functional and radiographic analysis of symptomatic patients with de novo degenerative lumbar and thoracolumbar scoliosis. ⋯ Reduced lumbar lordosis and increased lumbosacral scoliosis can affect the general health status of older patients with de novo degenerative scoliosis. Lateral olisthesis, mainly, and anteroposterior olisthesis are important elements of rotatory subluxation in the lumbar curves, which are important radiographic parameters, predicting symptomatology and health status of patients with de novo degenerative scoliosis.
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Statistical Classification Model for nonspecific chronic low back pain (NS-CLBP) patients and controls based on parameters of motor control. ⋯ Selected biomechanical variables were predictors for subgroup membership and were able to discriminate the 3 subgroups. This study adds further support toward the validation of the proposed classification system.