Andrew Kyle Simpson

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BACKGROUND Computerized tomographic scans are routinely obtained to evaluate a number of musculoskeletal conditions. However, since computerized tomographic scans expose patients to the greatest amounts of radiation of all imaging modalities, the physician must be cognizant of the effective doses of radiation that are administered. This investigation was(More)
STUDY DESIGN Cross-sectional study. OBJECTIVE To calculate the effective radiation doses of routine anteroposterior (AP) and lateral radiographs of the cervical and lumbar spines. SUMMARY OF BACKGROUND DATA Although plain radiographs are generally used as the initial imaging modality for the evaluation of patients with spinal complaints, the radiation(More)
STUDY DESIGN Independent retrospective review of prospectively collected data, comparative cohort study. OBJECTIVE The objective of this study was to compare the clinical, radiographical, and cost/value of the addition of an interbody arthrodesis (IBA) to a posterolateral arthrodesis (PLA) in the surgical treatment of L4-L5 degenerative spondylolisthesis(More)
STUDY DESIGN Systematic review. OBJECTIVE To perform a comparison of randomized controlled trial (RCT) abstracts and manuscripts published in recent spinal literature. SUMMARY OF BACKGROUND DATA RCTs represent the "gold standard" upon which evidence-based treatment decisions are made. Inconsistencies between an abstract and manuscript can mislead(More)
BACKGROUND CONTEXT A variety of orthoses are routinely applied after spinal procedures but there are limited data regarding their efficacy, especially with the increasing use of internal fixation. At this time, the proper indications for postoperative bracing are not well established. PURPOSE To assess the postoperative bracing patterns of spine surgeons.(More)
STUDY DESIGN Radiographic evaluation of cadaveric cervical spine specimens. OBJECTIVE Assess reliability and reproducibility of foraminal dimensions obtained from cervical radiographs of varying obliquity and determine optimal angles for visualizing foramina at each cervical spine level. SUMMARY OF BACKGROUND DATA Oblique radiographs may be considered(More)
STUDY DESIGN Retrospective review and multivariate analysis. OBJECTIVE Assess cervical spine segmental range of motion (ROM) with flexion/extension (F/E) radiographs and determine the relation to clinical variables. SUMMARY OF BACKGROUND DATA Previous studies investigated the roles of age and degeneration on cervical ROM with univariate analyses.(More)
OBJECTIVES The goal of this study was to compute the dynamic neck loads during simulated high-speed bilateral facet dislocation and investigate the injury mechanism. METHODS Ten osteoligamentous functional spinal units (C3/4, n = 4; C5/6, n = 3; C7/T1, n = 3) were prepared with muscle force replication, motion tracking flags, and a 3.3-kg mass rigidly(More)
STUDY DESIGN This study was a retrospective one. OBJECTIVE The objective of the study was to analyze the causes, prevalence of, and risk factors for coronal decompensation in long adult lumbar spinal instrumentation and fusion (from thoracic or upper lumbar spine) to L5 or S1. SUMMARY OF BACKGROUND DATA Coronal and sagittal decompensation after long(More)
STUDY DESIGN Retrospective review and multivariate analysis. OBJECTIVES Assess lumbar spine segmental range of motion (ROM) with flexion/extension (F/E) radiographs and determine the relation to clinical variables. SUMMARY OF BACKGROUND DATA Prior studies have investigated the roles of age and degeneration on lumbar segmental ROM only using univariate(More)