Robert A. Hart

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BACKGROUND Positive spinal regional and global sagittal malalignment has been repeatedly shown to correlate with pain and disability in thoracolumbar fusion. OBJECTIVE To evaluate the relationship between regional cervical sagittal alignment and postoperative outcomes for patients receiving multilevel cervical posterior fusion. METHODS From 2006 to(More)
STUDY DESIGN Retrospective review of a prospectively collected database. OBJECTIVE Our objective was to assess the rates of postoperative wound infection associated with spine surgery. SUMMARY OF BACKGROUND DATA Although wound infection after spine surgery remains a common source of morbidity, estimates of its rates of occurrence remain relatively(More)
Real Wage Cyclicality of Job Stayers, Within-Company Job Movers, and Between-Company Job Movers Using the British New Earnings Survey Panel Data (NESPD) for the period 1975 to 2001 we estimate the wage cyclicality of job stayers (those remaining within single jobs in a given company), within company job movers, and between company job movers. We also(More)
STUDY DESIGN A retrospective review of consecutive patients with graft migration or displacement after anterior cervical corpectomy surgery was performed. OBJECTIVES To examine the associated risk factors and results of treatment among patients who sustained graft displacement or migration after anterior cervical corpectomy surgery. SUMMARY OF(More)
STUDY DESIGN A cadaveric study comparing image guidance technology to fluoroscopic guidance as a means of pedicle screw placement in the thoracic spine, using a unique starting point for screw placement. OBJECTIVE To assess accuracy of thoracic pedicle screw placement using image guidance versus fluoroscopic guidance for screw insertion. SUMMARY OF(More)
BACKGROUND Adult spinal deformity is a prevalent cause of pain and disability. Established measures of sagittal spinopelvic alignment such as sagittal vertical axis and pelvic tilt can be modified by postural compensation, including pelvic retroversion, knee flexion, and the use of assistive devices for standing. We introduce the T1 pelvic angle, a novel(More)
STUDY DESIGN Prospective multicenter study evaluating operative (OP) versus nonoperative (NONOP) treatment for adult spinal deformity (ASD). OBJECTIVE Evaluate correlations between spinopelvic parameters and health-related quality of life (HRQOL) scores in patients with ASD. SUMMARY OF BACKGROUND DATA Sagittal spinal deformity is commonly defined by an(More)
STUDY DESIGN Thoracic pedicle screws were stimulated electrically while recording electromyography (EMG) activity in associated muscle groups intraoperatively. Screw position was then evaluated after surgery using computed tomography (CT). The CT results were compared with evoked EMG threshold values. OBJECTIVE To report our experience with pedicle screw(More)
STUDY DESIGN Multicenter, retrospective series. OBJECTIVE To analyze the incidence, mode, and location of acute proximal junctional failures (APJFs) after surgical treatment of adult spinal deformity. SUMMARY OF BACKGROUND DATA Early proximal junctional failures above adult deformity constructs are a serious clinical problem; however, the incidence and(More)
Insects in temperate regions are predicted to be at low risk of climate change relative to tropical species. However, these assumptions have generally been poorly examined in all regions, and such forecasting fails to account for microclimatic variation and behavioural optimisation. Here, we test how a population of the dominant ant species, Iridomyrmex(More)