Spine
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Comparative Study
Biomechanical comparison of instrumented posterior lumbar interbody fusion with one or two cages by finite element analysis.
Using finite element models to study the biomechanics of lumbar instrumented posterior lumbar interbody fusion (PLIF) with one or two cages. ⋯ A single cage inserted in an instrumented PLIF gains approximate biomechanical stability, slight greater subsidence, and a slight increase in screw stress but less early degeneration in adjacent disc. Adjusting these factors, instrumented PLIF with one cage could be encouraged in clinical practice.
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An anatomic and biomechanical bench-top basic scientific comparative analysis to determine the appropriateness of total disc replacement (TDR) in a lumbar spine with scoliotic tendencies. ⋯ The neutral zone of the intact cervical spine was restored even using an unconstrained cervical TDR. The greater inherent rotational constraints of the cervical spine make it more amenable to stable multilevel arthroplasty compared with the lumbar spine.
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Descriptive study of the Scoliosis Research Society (SRS) Classification for Adult Spinal Deformity using interobserver reliability measures for validation of the system. ⋯ A uniform system for classification of adult spinal deformity has significant utility in improving the ability of surgeons and authors to compare and combine similar cases, and in improving the accuracy of reports on the outcomes of care for adults with spinal deformity. The SRS Classification System for Adult Spinal Deformity has good interobserver reliability and is predictive of surgical strategies. Further validation of the SRS Classification System will include measures of intraobserver reliability, and inclusion of clinical characteristics of patient presentation and comorbidities.
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Comparative Study
Effect of different upright sitting postures on spinal-pelvic curvature and trunk muscle activation in a pain-free population.
A normative within-subjects single-group study. ⋯ Different upright sitting postures resulted in altered trunk muscle activation. Thoracic when compared to lumbo-pelvic upright sitting involved less coactivation of the local spinal muscles, with greater coactivation of the global muscles. These results highlight the importance of postural training specificity when the aim is to activate the lumbo-pelvic stabilizing muscles in subjects with back pain.
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An in vitro biomechanical study. ⋯ Anterior cervical corpectomy and SCAS, a novel method of anterior cervical spine decompression and reconstruction, was introduced. The in vitro biomechanical study showed that anterior cervical corpectomy and SCAS had sufficient immediate stability except for the lateral bending, compared with anterior cervical corpectomy and SP, in a 1-level cadaveric cervical spine model. However, an animal experimental in vivo evaluation of anterior cervical corpectomy and SCAS still has to be performed.