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Khoi D. Than, Paul Park, Kai-Ming Fu, Stacie Nguyen, Michael Y. Wang, Dean Chou, Pierce D. Nunley, Neel Anand, Richard G. Fessler, Christopher I. Shaffrey, Shay Bess, Behrooz A. Akbarnia, Vedat Deviren, Juan S. Uribe, Frank La Marca, Adam S. Kanter, David O. Okonkwo, Gregory M. Mundis Jr., Praveen V. Mummaneni and the International Spine Study Group

that the spines of patients who do the worst are not appropriately corrected in the sagittal plane and are perhaps fused into a fixed sagittal plane deformity. The increased mean SVA in both groups probably represents the limited ability to improve sagittal alignment with early MIS techniques. Similarly, the unchanged PILL mismatch in the worst group reflects a lack of sagittal alignment improvement obtained by the early MIS approaches we used. These results highlight the basis of the MISDEF algorithm we created to guide MIS versus open treatment in patients with

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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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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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-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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kyphosis correction and in a maintenance of the sagittal alignment similar to a long-segment instrumentation allowing to save two or more segments of vertebral motion. J Neurosurg Journal of Neurosurgery JNS 0022-3085 1933-0693 American Association of Neurological Surgeons 10.3171/2017.4.JNS.AANS2017abstracts 2017.4.JNS.AANS2017ABSTRACTS Oral Presentations 645: Enhanced Preoperative Prediction of Discharge Disposition for Neurosurgical Patients Nikhil Sharma , Matthew Piazza , MD , Rebecca DeMoor