lumbar_spine_research_society

Lumbar Spine Research Society

http://www.lsrs.org/

6th Annual Lumbar Spine Research Society Meeting April 11-12, 2013-Sofitel Chicago Water Tower Hotel

2012

Abstracts of the 2012 Meeting of the Lumbar Spine Research Society April 26–27, 2012 Pages A1-A38 Poster 1. Transdiscal Fixation for High Grade Spondylolisthesis Brett A. Braly, MD, Nicholas Spina, MD, W. T. Ward, and Joon Y. Lee, MD Poster 2. Comparison of clinical outcomes following Interspinous Process Distractor (X-STOPTM) Implantation or Interlaminar Lumbar Instrumented Fusion (ILIFTM) for lumbar spinal stenosis Charles Milchteim, MD, Joseph R. O'Brien, MD, MPH, Michael T. Benke, MD, Matthew R. Livingood, and Warren D. Yu, MD Poster 3. Use Of Recombinant Human Bone Morphogenetic Protein-2 (rhBMP-2) Without Iliac Crest Bone Graft In Posterolateral Lumbar Spine Fusion (PLF) Daniel K. Park, MD, Sung Soo Kim, and Scott Boden, MD Poster 4. Evaluation of Self Reported Functional Limitations Due to Lumbar Stiffness in Adult Spinal Deformity Patients Robert A. Hart, MD, Alan H. Daniels, MD, Praveen V. Mummaneni, MD, Richard A. Hostin, MD, Christopher I. Shaffrey, MD, Justin S. Smith, MD, PhD, Bret Line, Virginie Lafage, PhD, and Shay Bess, MD Poster 5. Functional Limitations Due to Lumbar Stiffness Correlate with Age and SRS-22 Scores in Asymptomatic Volunteers Robert A. Hart, MD, Alan H. Daniels, MD, Praveen V. Mummaneni, MD, Bret Line, Virginie Lafage, PhD, Behrooz A. Akbarnia, MD, Gregory M. Mundis, MD, and Shay Bess, MD Poster 6. Comparison Of Cortical Trajectory And Traditional Pedicle Screw Loosening In Lumbar Spine With Cyclic Loading Erkan Alci, MD, and Jonathan Gottlieb, MD Poster 7. Analysis of the Techniques for Thoracic and Lumbar Level Localization During Posterior Spine Surgery and the Occurrence of Wrong Level Surgery: Results from a National Survey Jillian E. Mayer, BA, Rajan P. Dang, BA, Guillermo D. Prieto, MD, Samuel K. Cho, MD, Sheeraz A. Qureshi, MD, MBA, and Andrew C. Hecht, MD Poster 8. Institutional Screening for Methicillin-Resistant Staphylococcus aureus in Patients Undergoing Spine Surgery Leo Spector, MD, Lisa Kelly, MSN, Julie Jerman, BBA, Ruth Hallmark, BSN, RN, ONC, CIC, Susan Odum, Med, Rebecca Lark, MD, and Bruce Darden, MD Poster 9. Patient Impressions of Reimbursement for Orthopedic Spine Surgeons K. Linnea Welton, MD, Mufaddal M. Gomberawalla, MD, Jeffrey S. Fischgrund, MD, Gregory P. Graziano, MD, and Rakesh D. Patel, MD Poster 10. Rates and Causes of Mortality Associated with Spine Surgery Based on 108, 419 Procedures: A Review of the Scoliosis Research Society Morbidity and Mortality Database Justin S. Smith, MD, PhD, Dwight Saulle, MD, Ching-Jen Chen, BA, Lawrence G. Lenke, MD, David W. Polly Jr, MD, Manish K. Kasliwal, MD, Paul A. Broadstone, MD, Steven D. Glassman, MD, Alexander R. Vaccaro, MD, PhD, Christopher P. Ames, MD, and Christopher I. Shaffrey, MD Poster 11. Long-term Clinical and Functional Outcomes After Laminectomy and Fusion for Degenerative Disease vs. Spondylolisthesis Dennis Crandall, Jan Revella, RN, Kurt Crandall, and Ryan McLeMore, PhD Poster 12. Long-term Narcotic Usage Following Spinal Surgery Daniel Gaffney, MD, Michael D. Daubs, Brandon D. Lawrence, MD, Darrel S. Brodke, MD, Alpesh A. Patel, MD, and Thomas Higgins, MD Poster 13. Facet Joint Violation in Pedicle Screw Placement with Intraoperative 3-Dimensional CT (O-arm) Image-Guidance Sharon C. Yson, MD, Jonathan N. Sembrano, MD, Peter C. Sanders, MD, Edward Rainier G. Santos, MD, and David W. Polly Jr., MD Poster 14. Arthrodesis and Pseudarthrosis Rates in 78 Studies Utilizing a Rabbit Posterolateral Spine Arthrodesis Model with Iliac Crest Autograft Jason H. Ghodasra, B.S., Erika L. Daley, B.A., Erin L. Hsu, Ph.D., and Wellington K. Hsu, M.D. Poster 15. The Impact Of Reduction Of Pain Following Lumbar Spine Surgery: The Relationship Between Changes In Pain And Changes In Function And Disability Richard L. Skolasky, ScD, Stephen T. Wegener, PhD, Anica M. Maggard, BS, and Lee H. Riley III, MD Poster 16. Lumbar Spinous Process Splitting Laminoplasty: A Novel Technique for Minimally Invasive Lumbar Decompression. Report on 27 Patients Ahmad Nassr, M.D., Charbel D. Moussallem, M.D., FEBOT, Bradford Currier, M.D., Michael Yaszemski, M.D., PhD, Paul Huddleston, M.D., Peter Rose, M.D., and Mark Dekutoski, M.D. Poster 17. Improvement Of Sagittal Balance And Lumbar Lordosis Following Less Invasive Adult Spinal Deformity Surgery With Expandable Cages And Percutaneous Instrumentation Michael Y. Wang Poster 18. Long-Term Clinical, Functional, and Occupational Outcomes Following TLIF with rhBMP: Smokers vs. Nonsmokers Dennis Crandall, MD, Matthew Wilson, Jan Revella, RN, Dustin Revella, BA, and Ryan McLemore, PhD Poster 19. Primary vs. Revision Fusion: How Well Do Patients Walk Long-term? Dennis Crandall, Melissa Gebhardt, PA-C, Jan Revella, RN, Dustin Revella, BA, and Ryan McLemore, PhD Poster 20. Fixed vs. Expandable Cage In TLIF: A Radiographic Comparison Dennis Crandall, Sigurd Berven, MD, Neel Anand, MD, Murali Kadaba, PhD, Eric Huish, BS, and Ryan McLemore, PhD Poster 21. Meta-Analysis of Vertebroplasty Compared to Conservative Treatment William L. Tontz, MD, Paul A. Anderson, MD, and Alex Froysteter, BA Poster 22. Incidence And Morbidity Of Concomitant Spine Fractures In Combat Related Amputees Adam Bevevino, MD, Ronald A. Lehman, MD, Daniel G. Kang, MD, Scott M. Tintle, MD, Theodora Dworak, BS, and Benjamin K. Potter, MD Poster 23. The Biomechanical Consequences Of Rod Reduction Following Facetectomy In The Lumbar Spine Adam Bevevino, MD, Ronald A. Lehman, MD, Daniel G. Kang, MD, Melvin D. Helgeson, MD, Rachel Gaume, BS, Paul Happel, BS, and Anton E. Dmitriev, PhD Poster 24. Do Ponte Osteotomies Affect The Biomechanical Consequences Of Rod Reduction In The Thoracic Spine? Daniel G. Kang, Adam J. Bevevino, MD, Ronald A. Lehman, MD, Rachel E. Gaume, BS, Melvin D. Helgeson, MD, and Anton E. Dmitriev, PhD Poster 25. The Ventral Lamina and Superior Facet Rule: A Morphometric Analysis for Ideal Thoracic Pedicle Screw Start Point Ronald A. Lehman, MD, Daniel G. Kang, Lawrence G. Lenke, MD, Rachel Gaume, BS, and Haines Paik, MD Poster 26. Biologic Augmentation of the Intervertebral Disc with a Growth Factor-Loaded Chitosan Hydrogel Administered Percutaneously: A Rabbit Nucleotomy Model Casey Bachison, M.D., Tristan Maerz, M.S., Kevin Baker, Ph.D., Harry Herkowitz, M.D., and Jeffrey Fischgrund, M.D. Poster 27. In Vivo Delivery of E. Coli-Expressed rhBMP-2 by Biomimetic Calcium Phosphate Coatings in the Setting of Lumbar Spine Fusion: Effect of Incoporated Dose Siddharth Badve, M.D., Casey Bachison, M.D., Kevin Baker, Ph.D., Jeffrey Fischgrund, M.D., and Harry Herkowitz, M.D. Poster 28. Hidden Blood Loss During Posterior Spinal Fusion Yossi Smorgick, MD, Harry Herkowitz, MD, Kevin Baker, David Montgomery, and Jeffrey S. Fischgrund, MD Poster 29. 24 Month Functional Outcomes From The US IDE Trial Evaluating The Stabilimax®, A Lumbar Posterior Dynamic Stabilization (PDS) System With Interpedicular Travel (IPT) Neel Anand, MD, Antonio Castellvi, MD, Ken Yonemura, MD, Scott Kitchel, MD, Boyle Cheng, PhD, and Bruce Robie, PhD Poster 30. The Impact Of Pain Reduction Following Lumbar Spine Surgery: The Relationship Between Pain And Depression Richard L. Skolasky, Lee H. Riley III, MD, Anica M. Maggard, BS, and Stephen T. Wegener, PhD Poster 31. Vascular Injury and Exposure in Anterior Lumbar Interbody Fusions Daniel Lubelski, Vladimir Zahradnik, MD, Kalil G. Abdullah, Vikram Kashyap, MD, and Thomas E. Mroz, MD Poster 32. A comparison of Open versus MIS TLIFs in a Worker's Compensation Patient Population Kern Singh, M.D., Miguel Pelton, B.S., and Frank M. Phillips, M.D. Poster 33. A Peri-operative Cost And Charge Analysis Following Single Level Minimally Invasive Versus Open Transforaminal Lumbar Interbody Miguel Pelton, B.S., Kern Singh, M.D., and Frank M. Phillips, M.D. Poster 34. Return To Golf After Spine Surgery Dennis Crandall, MD, David Swanson, MD, Jan Revella, RN, Jason Datta, MD, Michael Chang, MD, Terrence Crowder, MD, and Ryan McLemore, PhD Poster 35. The Effect Of Low Dose Bone Morphogenic Protein (rhbmp-2) On Posterolateral Fusion In Adult Spinal Deformity Surgery Justin B. Hohl, MD, Michael D. Daubs, MD, Jayme R. Hiratzka, MD, Prokopis Annis, MD, Brandon D. Lawrence, MD, and Darrel S. Brodke, MD Poster 36. A Retrospective Study of the Multiply Operated Back due to Lumbar Spinal Stenosis Norifumi Suga Poster 37. Biomechanical Assessment of Anterior Thoracolumbar Fixation: A Comparison of the Significance of Cross Connectors in a Calf Model Martin Gehrchen, M.D, Ph.D., Sajan K. Hegde, M.D., Mark Moldavsky, Suresh Chinthukunta, M.S., Manasa Gudipally, M.S., Brandon Bucklen, Ph.D., and Saif Khalil, Ph.D. Poster 38. The Accuracy of Intraoperative 3D image guided Percutaneous Pedicle Screw Insertion Edward Rainier G. Santos, MD, Jonathan N. Sembrano, MD, Charles Gerald T. Ledonio, MD, Sharon C. Yson, MD, A. Noelle Larson, MD, and David W. Polly Jr., MD Poster 39. A Prospective Evaluation of Minimally Disruptive Lateral Interbody Fusion in the Treatment of Degenerative Spondylolisthesis: Mid-term Clinical and Radiographic Outcomes Kaveh Khajavi, Alessandria Y. Shen, BA, and Anthony L. Hutchison, MSN Poster 40. Anterior Lumbar Interbody Fusion: The Use Of Ct In The Postoperative Patient And Guidelines On The Appropriate Time For Follow Up Imaging Sima Banerjee, MD, Tharwat El-zahran, MD, John G. Heller, MD, Claude Pierre-Jerome, MD, Walt Carpenter, MD, Scott Boden, MD, Jian Kang, Michael R. Terk, MD, Ali Zahrai, Joe W. Chiles, and Daniel Refai Poster 41. Can Annular Reconstruction Reduce the Incidence of and Re-operations for Recurrent Herniated Nucleus Pulposus? Jeffrey D. Coe, and Jianghui Zhang, MD Paper 1. Minimally Invasive versus Open Transforaminal Lumbar Interbody Fusion (TLIF) for Degenerative Spondylolisthesis: Comparative Effectiveness and Cost-utility Analysis Scott L. Parker, M.D., Stephen K. Mendenhall, B.S., David N. Shau, B.S., Scott L. Zuckerman, B.S., and Matthew J. McGirt, M.D. Paper 2. Single Versus Multilevel Fusion, For Single Level Degenerative Spondylolisthesis And Multilevel Lumbar Stenosis. Four-Year Results of the Spine Patient Outcomes Research Trial Yossi Smorgick, MD, Jeffrey S. Fischgrund, MD, Daniel Park, MD, Kevin Baker, PhD, Jon D. Lurie, MD, MS, Wenyan Zhao, PhD, Harry Herkowitz, MD, and James N. Weinstein, DO, MS Paper 3. Long-Term Re-operation Rates With Surgical Treatment of Lumbar Spondylolisthesis Abdul Baker, MD, Beatrice Ugiliweneza, PhD, MSPH, Chirag Patil, MD, MS, Shivanand Lad, MD, PhD, Lad, MD, PhD, and Maxwell Boakye, MD, MPH Paper 4. Complications Following Use Of RhBMP-2 In Anterior Lumbar Interbody Fusion Daniel Lubelski, Kalil G. Abdullah, Amy S. Nowacki, PhD, Matthew D. Alvin, Michael P. Steinmetz, MD, Edward C. Benzel, MD, and Thomas E. Mroz, MD Paper 5. Retrograde Ejaculation Following Single-Level Anterior Lumbar Surgery with or without rhBMP-2 in Five Randomized Controlled Trials J. Kenneth Burkus, MD, Randall F. Dryer, MD, and John H. Peloza, MD Paper 6. Anterior Lumbar Interbody Fusion With Recombinant Human Bone Morphogenetic Protein-2 And Retrograde Ejaculation: Results From A Non-industry Sponsored, Single Surgical Team Alexander Ghanayem, MD, and John Santaniello, MD Paper 7. Recurrent Stenosis Following Transforaminal Interbody Fusion (TLIF) Using Bioresorbable Cages and Bone Morphogenic Protein Jeffrey D. Coe, MD, Michael W. Cluck, MD, PhD, and Jianghui Zhang, MD Paper 8. The Presence and Distribution of Leg Pain After Spine Surgery: Laminectomy vs. TLIF with BMP Dennis Crandall, MD, Jan Revella, RN, Dustin Revella, BA, and Ryan McLemore, PhD Paper 9. Cost-utility And Comparative Effectiveness Analyses Of Transforaminal Lumbar Interbody Fusion (tlif) Versus Comprehensive Medical Management For Lumbar Spondylolisthesis Scott L. Parker, M.D., Scott Zuckerman, B.S., David N. Shau, B.S., Stephen K. Mendenhall, B.S., and Matthew J. McGirt, M.D. Paper 10. Translational Correction of High Grade Spondy lolisthesis: What Distal Anchorage is Best? Dennis Crandall, MD, Kenneth Schmidt, MD, and Jan Revella, RN Paper 11. Relationship Of The Lumbar Lordosis Angle To The Abdominal Aortic Bifurcation And Inferior Vena Cava Confluence Levels Charbel D. Moussallem, M.D., FEBOT, Ibrahim Abou Hamad, PhD, Christine EL-Yahchouchi, M.D., Maroun D. Moussallem, PhD, Damien Arnalsteen, M.D, Patrice Mertl, M.D., PhD, and Heric Havet, M.D., PhD Paper 12. Change in Functional Activity One Year Following Lumbar Decompression with or without Fusion Rosanna L. Wustrack, MD, Guillermo Ramirez, BS, and Shane Burch, MD Paper 13. Pitfalls of Calculating Hospital Readmission Rates Based Solely on Nonvalidated Administrative Datasets Beejal Amin, MD, Urvij Modhia, Steven Takemoto, PhD, Dean Chou, MD, Vedat Deviren, Christopher Ames, Sigurd Berven, MD, and Praveen Mummaneni Paper 14. Cost effective Analysis Utilizing a Markov Model: Total Hip Arthroplasty and Total Knee Arthroplasty for Osteoarthritis vs. Posterior Spinal Fusion for Degenerative Lumbar Spondylolisthesis Brian Cunningham, MD, Dennis Crandall, MD, and Ryan McLemore, PhD Paper 15. Intradiscal Injection Of Simvastatin Results In Radiologic, Histologic, And Genetic Evidence Of Disc Regeneration In A Rat Model Of Degenerative Disc Disease Khoi D. Than, Shayan U. Rahman, M.D., Lin Wang, M.D., Kwaku A. Kyere, B.A., Tracey T. Than, Adam Khan, B.A., Frank La Marca, M.D., Paul Park, M.D., Huina Zhang, M.D., Ph.D., and Chia-Ying Lin, Ph.D. Paper 16. Notochordal Cells Protect Nucleus Pulposus Cells From Degradation And Apoptosis: Implications For The Mechanisms Of Intervertebral Disc Degeneration William M. Erwin, DC, PhD, Diana Islam, MSc, Robert D. Inman, MD, FRCP (C), Michael G. Fehlings, MD, PhD, FRCS (C), and Florence WL Tsui, PhD Paper 17. The Variability Of Commercially Available Scaffolds In Promoting Osteogenesis In Vitro Jason Ghodasra, Michael Nickoli, MD, Samuel I. Stupp, PhD, Wellington K. Hsu, MD, and Erin L. Hsu, PhD Paper 18. Characterization Of Calcified Fibrocartilage within the Lumbar Vertabrae Before and After Standard Cortical Endplate Preparation Sarina Sinclair, Michael Daubs, Brandon Lawrence, Darrel Brodke, and Alpesh Patel Paper 19. The Reliability Of The Thoracolumabar Injury Classification And Severity Score Among Orthopedic Surgeons At Different Levels Of Training Adam J. Bevevino, MD, Ronald A. Lehman, MD, Daniel G. Kang, MD, John P. Cody, MD, Robert W. Tracey, MD, Robert W. Tracey, MD, and Husain Bharmal, MD Paper 20. The Impact of Nonoperative Treatment, Vertebroplasty, and Kyphoplasty on Survival and Morbidity after a Vertebral Compression Fracture in the Medicare Population Andrew T. Chen, David B. Cohen, MD, and Richard L. Skolasky Paper 21. Racial Differences In Lumbar Spinous Process Anatomy Relevant To Interspinous Process Spacer Surgery Jeremy D. Shaw, BA, Daniel R. Cooperman, MD, Jason D. Eubanks, MD, Daniel L. Shaw, Ling Li, MSPH, and David H. Kim, MD Paper 22. Adverse clinical outcomes following rhBMP-2 Use in a Minimally Invasive Transforaminal Lumbar Interbody Fusion Miguel Pelton, B.S., Thomas D. Cha, M.D., Safdar N. Khan, M.D., and Kern Singh, M.D. Paper 23. Long-term Effects Of Bone Morphogenetic Protein In Lumbar Fusion Beatrice Ugiliweneza, PhD, MSPH, Chirag G. Patil, MD, MS, Shivanand P. Lad, MD, PhD, Abdul A. Baker, MD, and Maxwell Boakye, MD, MPH Paper 24. Adverse Events With The Use Of RhBMP-2 In Thoracolumbar And Lumbar Spine Fusions: A Nine Year Institutional Analysis Daniel Lubelski, Kalil G. Abdullah, Michael P. Steinmetz, MD, Matthew D. Alvin, Amy S. Nowacki, PhD, Edward C. Benzel, MD, and Thomas E. Mroz, MD Paper 25. The Real Life Use of Bone Morphogenic Protein in the United States Jason W. Savage, MD, and Paul A. Anderson, MD Paper 26. Early Failures Following Surgical Treatment For Spinal Stenosis With Lumbar Deformity Darrel S. Brodke, MD, Prokopis Annis, MD, Brandon D. Lawrence, MD, Justin B. Hohl, MD, Jayme R. Hiratzka, MD, and Michael D. Daubs, MD Paper 27. Perioperative Complications of Pedicle Subtraction Osteotomy Michael D. Daubs, MD, Prokopis Annis, MD, Brandon D. Lawrence, MD, and Darrel S. Brodke, MD Paper 28. The Schwab-SRS Adult Spinal Deformity Classification: Assessment and Clinical Correlations Based On A Prospective Operative and Non-Operative Cohort Frank Schwab, MD, Virginie Lafage, MD, Christopher Shaffrey, MD, Justin Smith, MD, PhD, Benjamin Blondel, MD, Christopher Ames, MD, Kai-Ming Fu, MD, PhD, Praveen Mummaneni, MD, Douglas Burton, MD, Munish Gupta, MD, Vedat Deviren, MD, Gregory Mundis, MD, Robert Hart, MD, Shay Bess, MD, and International Spine Study Group Paper 29. Degenerative Lumbar Scoliosis vs. Adult Idiopathic Scoliosis: Long-term Outcomes and Complications Following Surgical Correction Robert Waldrop, MD, Dennis Crandall, MD, Jan Revella, RN, Michael Chang, MD, and Ryan McLemore, PhD Paper 30. The Accuracy of Pedicle Screw Insertion Using Intraoperative Three-dimensional Image Guidance Edward Rainier G. Santos, Jonathan N. Sembrano, MD, Charles Gerald T. Ledonio, MD, A. Noelle Larson, MD, Sharon C. Yson, MD, and David W. Polly Jr., MD Paper 31. Trans-cranial Motor Evoked Potential Neuromonitoring During Trans-psoas Lumbar Interbody Fusion Kshitij Chaudhary, MD, Katharine Speights, BS, CNIM, Kevin McGuire, MD, and Andrew P. White, MD Paper 32. Radiation Exposure To The Spine Surgeon In Lumbar And Thoracolumbar Fusions With The Use Of An Intraoperative Computed Tomography 3-dimensional Imaging System Daniel Lubelski, Frank S. Bishop, MD, Kalil G. Abdullah, Michael P. Steinmetz, MD, Edward C. Benzel, MD, and Thomas E. Mroz, MD Paper 33. Implant Footprint and Vertebral Augmentation Improve Resistance to XLIF Interbody Cage Subsidence in Osteoporotic Patients Benjamin Y. Chen, MD, Wayne K. Cheng, MD, Alexander W. L. Turner, PhD, Bryan Cornwall, PhD, and Mark Peterson, MD Paper 34. Pedicle Screw “Hubbing” in the Adult and Immature Thoracic Spine: A Biomechanical and Micro-Computed Tomography Evaluation Daniel G. Kang, Ronald A. Lehman, MD, Adam Bevevino, MD, Anton E. Dmitriev, PhD, Rachel E. Gaume, BS, Haines Paik, MD, and Lawrence G. Lenke, MD Paper 35. Dynamic Biomechanical Examination of the Lumbar Spine with Implanted Total Disc Replacement (TDR) Utilizing a Pendulum Testing System Alan H. Daniels, MD, David J. Paller, Sarath Koruprolu, Matthew McDonnell, MD, Mark A. Palumbo, MD, and Joseph J. Crisco, PhD Paper 36. Clinical Outcomes following Silicate -Substituted Calcium Phosphate use in a Minimally Invasive Transforaminal Lumbar Interbody Fusion Miguel Pelton, B.S., and Kern Singh, M.D. Paper 37. The Impact of Diabetes on Spinal Arthrodesis: Analysis of Complications and Outcomes Robert Waldrop, MD, Dennis Crandall, MD, Jan Revella, RN, Michael Chang, MD, and Ryan McLemore, PhD Paper 38. Long-term Outcome Of Minimally Invasive Transforaminal Lumbar Interbody Fusion; 5 Years Post-op And Beyond Kevin T. Foley, M.D., and Hamid Shah, M.D. Paper 39. Intervertebral Disc-derived Stem Cells: Implications For Regenerative Medicine And Neural Repair William M. Erwin, DC, PhD, Diana Islam, MSc, Eftekhar Eftekarpour, PhD, Robert Davies Inman, MD FRCP, and Michael George Fehlings, MD, PhD, FRCS(C) Paper 40. Evaluation of a Novel Bioactive Nanofiber Scaffold to Elicit Spine Fusion in a Rodent Arthrodesis Model Michael S. Nickoli, M.D., Jason H. Ghodasra, B.S., Marco Mendoza, M.D., Jacob Babu, Mahesh Polavarapu, David Nelson, Kaveesh Maharaj, Samuel I. Stupp, Ph.D., Jeff S. McKee, Ph.D., Shawn F. Bairstow, Ph.D., Erin L. Hsu, Ph.D., and Wellington K. Hsu, M.D. Paper 41. A Novel Therapeutic Agent for Rescuing the Adverse Effects of Advanced Glycation End-products in the Intervertebral Disc Alok Sharan, Lee Morse, MD, and Simon Tang Paper 42. Biomechanical Comparison of Spino-pelvic Fixation Constructs in the setting of Total Sacrectomy Stefan Mindea, MD, Suresh R. Chinthakunta, Mark Moldavsky, MS, Manasa Gudipally, MS, and Saif Khalil, PhD Paper 43. Caudad Pedicle Screw Compression Optimizes Thoracic Kyphosis Correction: A Microct And Biomechanical Analysis Of Pedicle Morphology And Screw Failure Adam J. Bevevino, MD, Ronald A. Lehman, MD, Daniel G. Kang, MD, Haines Paik, MD, Melvin D. Helgeson, MD, Rachel Gaume, BS, Anton E. Dmitriev, PhD, and Lawrence G. Lenke, MD Paper 44. Tapping Insertional Torque Predicts Better Pedicle Screw Fixation and Optimal Screw Size Selection Melvin D. Helgeson, MD, Daniel G. Kang, Ronald A. Lehman, MD, Anton E. Dmitriev, PhD, and Scott J. Luhmann, MD Paper 45. An Evaluation Of The Safety And Complications Of Pharmacologic VTE Prophylaxis After Spine Surgery David J. Lunardini, MD, Nicholas T. Spina, MD, Omar Ayyash, BS, Antonia F. Chen, MD/MBA, and Joon Y. Lee, MD Paper 46. Outcome and Treatment of Post-operative Spine Surgical Site Infections: Predictors of Treatment Success and Failure Keishi Maruo, MD, Sigurd Berven, MD, Serena Hu, MD, Shane Burch, MD, Vedat Deviren, Bobby Tay, MD, Amir Abdul-Jabbar, BA, Ames Christopher, MD, Praveen Mummaneni, MD, Dean Chou, MD, and Steven Takemoto, PhD Paper 47. Low-grade Isthmic vs. Degenerative Spondylolisthesis: Complications and Outcomes Following Decompression, Reduction, And Arthrodesis Dennis Crandall, MD, Melissa Gebhardt, PA-C, Jan Revella, RN, Dustin Revella, BA, and Ryan McLemore, PhD Paper 48. Serum 25-OH Vitamin D Levels in a Population of 51, 314 Patients Jeffrey M. Bair, M.D., Susan Bukata, M.D., Stephen L. Kates, M.D., Ellen Coyne, M.S., John T. Wright, M.S., and Glenn R. Rechtine, M.D. Paper 49. Likelihood of Reaching Minimal Clinically Important Difference (MCID) in Health Related Quality of Life (HRQOL) Measures: Prospective Analysis of Operative and Non-operative Treatment of Adult Spinal Deformity (ASD) Virginie Lafage, PhD, Justin Smith, MD, PhD, Frank Schwab, MD, Christopher Shaffrey, MD, Eric Klineberg, MD, Christopher Ames, Richard Hostin, MD, Kai-Ming Fu, MD, PhD, Praveen Mummaneni, MD, Khaled Kebaish, MD, Vedat Deviren, MD, Oheneba Boachie-Adjei, MD, Robert Hart, MD, Shay Bess, MD, and International Spine Study Group Paper 50. Pre-Operative Activity Levels do not Correlate to Self-Reported Scores in Patients with Lumbar Spine Disorders: Results of 81 Patients Rosanna L. Wustrack, Guillermo Ramirez, and Shane Burch, MD

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