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Anthony J. Kwon, William D. Hunter, Mark Moldavsky, Kanaan Salloum and Brandon Bucklen

: Suppl 1 S89 – S94 , 2000 18 Tohmeh AG , Khorsand D , Watson B , Zielinski X : Radiographical and clinical evaluation of extreme lateral interbody fusion: effects of cage size and instrumentation type with a minimum of 1-year follow-up . Spine (Phila Pa 1976) 39 : E1582 – E1591 , 2014 19 Watkins RG IV , Hanna R , Chang D , Watkins RG III : Sagittal alignment after lumbar interbody fusion: comparing anterior, lateral, and transforaminal approaches . J Spinal Disord Tech 27 : 253 – 256 , 2014 Disclosures Funding for this

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Doniel Drazin, Mir Hussain, Jonathan Harris, John Hao, Matt Phillips, Terrence T. Kim, J. Patrick Johnson and Brandon Bucklen

interaction between surgical construct and sacral slope angulation, intact lumbosacral stiffness showed increased sensitivity to sacral slope angles larger than 30° compared with other constructs, illustrated in Fig. 4 . These results demonstrate the main effect of sacral slope angles significantly impacting lumbosacral stiffness. Furthermore, post hoc analysis found that for sacral slopes larger than 40°, axial stiffness of the lumbosacral joint was compromised compared with less angulated pelvic sagittal alignment. FIG. 4. Graph showing mean axial stiffness

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examined include presence of interbody fusion, rod diameter, rod material, age and preop sagittal alignment. Methods: A retrospective review of a multicenter, prospective ASD database was conducted. Inclusion criteria: age=18yr, ASD, no revisions between >6wk and <2yrs postop. Spinal pelvic parameters, thoracic kyphosis (TK:T2-T12) and lumbar lordosis (LL:L1-S1) were measured overall and within and outside of the instrumented segments. Changes for SVA, PT, PI-LL, TK, and LL between 6wks-2yrs postop were calculated. Of these pts, the amount of thoracic loss and TL

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-0684 American Association of Neurological Surgeons 10.3171/2017.3.FOC-DSPNabstracts 2017.3.FOC-DSPNABSTRACTS Charles Kuntz Scholar Award Presentations (Abstracts 104–123) 119. Laminoplasty vs. Laminectomy-Fusion for the Treatment of Cervical Myelopathy: Preliminary Results from the CSM-Study Comparing Cervical Sagittal Alignment and Clinical Outcomes Vijay Ravindra , MD, MSPH , Jill Curran , MS , Praveen V. Mummaneni , MD , Adam S. Kanter , MD , Erica Fay Bisson , MD, MPH , Robert F. Heary , MD

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Background/Introduction: Transforaminal lumbar interbody fusion (TLIF) has become a popular surgical option to complement posterolateral fusion (PLF) for treatment of degenerative spinal conditions. Purported advantages of TLIF over PLF alone include enhanced fusion rates, improved sagittal alignment, and direct decompression of the neuroforamen. Earlier studies have examined these issues and yielded inconclusive results. Another often suggested advantage, that TLIF provides superior immediate stability and protects against early pedicle screw loosening, has never been

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sagittal alignment on MRI. In addition, no study has shown clinical superiority of flexion-extension xrays compared to upright static xrays in order to diagnose a lumbar anterolisthesis. Methods We retrospectively evaluated all patients presenting to spine clinic for degenerative lumbar conditions for 24 consecutive months who had an MRI, upright lateral, as well as flexion-extension radiographs at our institution. Comparing radiographic reads by a musculoskeletal radiologist, the incidence of degenerative spondylolisthesis found on dynamic flexion

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30; p<0.001). Conclusions The addition of PPI seems to have a protective effect on the development of PJK. The analysis controlled for preoperative sagittal alignment as well as for correction of PI-LL. HYB was effective in restoring sagittal global alignment and cMIS in maintaining it. Neurosurg Focus Neurosurgical Focus FOC 1092-0684 American Association of Neurological Surgeons 2014.3.FOC-DSPNABSTRACTS Abstract Mayfield Clinical Science 243. Microendoscopic Decompression for Cervical Spondylotic Myelopathy

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deformation of non-operative spine fractures and identify predictive variables of angular change. Summary of Background Data Loss of normal sagittal alignment of the spine is a common sequela following thoracolumbar injuries. Patients treated non-operatively are especially at risk; however knowledge of the natural history of these injuries and predictors of deformation over time remains limited. Methods Patients with thoracolumbar fractures were identified via a trauma database. The angular change about the fracture site was determined comparing initial CT

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greater Charlson comorbidity index (1.1 vs 0.85) than NONOP (n=446), respectively (p<0.05). OP had worse HRQOL scores on all surveys than NONOP (p<0.05). OP and NONOP had similar coronal alignment (p<0.05). OP had worse sagittal spinopelvic alignment for all measures than NONOP except cervical lordosis, TK and pelvic incidence (PI). OP had greater percentage of pure sagittal classification (type S; OP=23%, NON=14%; p<0.05). OP had worse grades for all modifier categories: PT (26% vs 16%), PI-lumbar lordosis mismatch (37% vs 21%) and global sagittal alignment (29% vs 9

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, Eric Massicotte , MD, MSc , and Michael Fehlings , MD, PhD (Toronto, Canada) 8 2015 123 2 History of Craniotomy, Cranioplasty, and Perioperative Care A493 A493 Copyright held by the American Association of Neurological Surgeons. You may not sell, republish, or systematically distribute any published materials without written permission from JNSPG. 2015 Introduction There is evidence that cervical sagittal alignment and spinal cord MRI hyperintensity correlate with disease severity in CSM patients. The impact of spinal