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 of a consecutive series of traumatic cervical spine injuries treated with halo vest immobilization (HVI) over an 8-year period at a level 1 trauma center. ⋯ Treatment with HVI was successful in 85% of patients and 74% of survivors completed their intended treatment period. Complications, though common, were mostly not severe. HVI is still a reasonable treatment option in managing cervical spine injuries.
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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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A case report. ⋯ Although stress fractures of the spinous process are very rare and can be overlooked in clinical settings, they should be considered in the differential diagnosis of severe dorsal neck pain in golfers, especially beginners.
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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.