Canadian Spine Society: 21st Annual Virtual Scientific Conference, Feb. 3, 10, 15, 17 and 24, 2021Abstract 45. Determining clinically important improvement following surgery for degenerative conditions of the spine: analysis of the Canadian Spine Outcomes and Research Network (CSORN) RegistryAbstract 31. Cost-utility analysis of microdiscectomy versus nonoperative management for the treatment of chronic radiculopathy secondary to lumbar disc herniationAbstract 44. Impact of undergoing thoracolumbar spine surgery on patient psychosocial healthAbstract 70. A comparison of functional and quality of life improvement in 6 different types of surgeryAbstract 54. The role of frailty and sarcopenia in predicting adverse events and mortality following en bloc resection of primary bone tumours and isolated metastases of the spineAbstract 27. Feasibility of achieving planned surgical margins in primary spine tumour: a PTRON studyAbstract 32. Care providers’ perspectives on potential expansion of medical assistance in dying criteria to persons with acute spinal cord injury: a qualitative studyAbstract 22. Does wait time for transfer from acute care to rehabilitation affect the outcomes following a traumatic spinal cord injury? A prospective cohort studyAbstract 86. Investigating and validating quantitative MRI biomarkers for demyelination, axon integrity and inflammation after traumatic spinal cord injuryAbstract 23. Does participating in a national spinal cord injury registry improve actual patient outcomes?Abstract 79. Can individuals expect normal quality of life following traumatic spinal cord injury? A cohort study compared with Canadian normative dataAbstract 79. Is the conversion of the American Spinal Injury Association Impairment Scale grade clinically meaningful for functional recovery in all patients with traumatic spinal cord injury?Abstract 101. Predicting massive intraoperative blood loss in adult spinal deformity surgeryAbstract 102. Use of preoperative opioids is a risk factor for persistent chronic postoperative opioid use in adult spinal deformity patientsAbstract 102. Comparison of a general (NSQIP) and spine specific (SAVES) database for the identification of spine surgery acute care adverse eventsAbstract 55. Trends in length of stay at a quaternary spinal care centre from 2006–2020Abstract 89. The impact of the COVID-19 pandemic on scheduled adult spine surgery in Toronto academic health sciences centres (AHSC): a wave 1 through early wave 2 experienceAbstract 60. Patient acceptance and satisfaction with virtual care in Ontario during and after COVID-19 lockdown restrictionsAbstract 39. Prospective randomized control study to evaluate the role of injection Cerebrolysin in operated cases of degenerative cervical myelopathyAbstract 47. Association between patient-reported outcomes and construct length in posterior cervical instrumentation for cervical spine myelopathyAbstract 52. Rate of revision surgery at adjacent and same segment for cervical disc replacement versus anterior cervical discectomy and fusionAbstract 104. Analysis of complication rates in cervical spine surgery between older patients and younger cohorts using the CSORN registry: Is age just a number?Abstract 49. Factors associated with increased length of stay in degenerative cervical spine surgery: cohort analysis from the Canadian Spine Outcomes and Research Network (CSORN)Abstract 51. Association between preoperative sagittal alignment and radiographic measures of decompression following cervical laminectomyAbstract 3. Analysis of the morphometric change in the uncinate process of cervical spondylosis patients: a study of radiologic anatomyAbstract 4. Does body mass index affect outcomes after vertebral body tethering surgery?Abstract 5. Congenital kyphosis: progressive correction with an instrumented posterior epiphysiodesisAbstract 6. The use of halo gravity traction in severe, stiff scoliosisAbstract 7. Fusing to the pelvis in the correction of scoliosis associated with Rett syndromeAbstract 8. Tuberculosis of the craniovertebral junction: its altered biomechanics and treatment strategyAbstract 9. Anatomic considerations and functional outcomes of endoscopic transiliac approach for access to L5–S1 disc and foramenAbstract 10. Five-year revision rates for elective multilevel lumbar instrumented fusions in the elderly: an analysis of state databasesAbstract 11. Lumbar PLIF without inpatient admission. Results of a standardized care protocol in over 100 selected patients treated over a 5-year periodAbstract 12. Frailty is an important predictor of 30-day morbidity in patients treated for lumbar spondylolisthesis using a posterior surgical approach: analysis of outcomes in 15 658 patients from the NSQIP databaseAbstract 13. Scoliosis flexibility correlates with postoperative outcomes following growth-friendly surgeryAbstract 14. Lumbar fusion surgery for patients with back pain and degenerative disc disease: an observational study f

Background: There is significant variability in clinically important improvement (CII) criteria for spinal surgery that suggest population-and diagnosis-specific thresholds are required to determine surgical success using patient-reported outcome measures (PROMs).This study establishes surgical CII thresholds for 4 common lumbar degenerative spinal diagnoses using accepted anchor-based methodology and commonly used PROMs.Methods: CII analysis was conducted using baseline and 1-year data from participants in the Canadian Spine Outcomes and Research Network (CSORN) registry who underwent surgery for lumbar spinal stenosis (LSS), degenerative spondylolisthesis (DS), disc herniation (DH) or degenerative disc (DD) from 2015 to 2018.One-year CII thresholds were determined for the Oswestry Disability Index (ODI), and back and leg Numeric Pain Rating Scales (NPRS).At 1 year, patients reported whether they were much better, better, the same, worse or much worse compared with before their surgery.This was used as the anchor (improved: ≥ "better" v. not improved: ≤ "same") to determine CII thresholds for absolute change and percentage change for PROMs using a receiver operating characteristic (ROC) curve approach, with maximization of the Youden index as primary criterion.Correct classification rates were determined.Results: There were 856 participants with LSS (39.1% female, mean age 65.8 yr), 591 with DS (64.1% female, mean age 65.8 yr), 520 with DH (47.5% female, mean age 46.8 yr) and 185 with DD (43.8% female, mean age 50.9 yr).CII for ODI change ranged from -10.0 (DD) to -16.9 (DH).CII for back and leg NPRS change was -2 to -3 for each group.CII for percentage change varied by PROM and pathology group, ranging from -11.1% (ODI for DD) to -50.0% (leg NPRS for DH).Correct classification rates for all CII thresholds ranged from 72.1% to 89.4%.Conclusion: This work quantifies Canadian CII thresholds for the ODI and back and leg NPRS for 4 common lumbar spinal surgery cohorts, with high classification accuracy.Our results suggest that use of generic CII across different diagnoses in spine surgery is not advised.This study establishes the first comprehensive set of responder criteria in Canada for broader application and specificity in clinical and research settings and for surgical prognostic work. Presentation A2 Abstract 31Cost-utility analysis of microdiscectomy versus non operative management for the treatment of chronic radiculopathy secondary to lumbar disc herniation.Andrew Glennie, 1 The Canadian Spine Society is a collaborative organization of spine surgeons advancing excellence in research, education and patient care.Accreditation: This event is an Accredited Group Learning Activity (Section 1) as defined by the Maintenance of Certification Program of the Royal College of Physicians and Surgeons of Canada, approved by The Canadian Orthopaedic Association. Course Objectives: Every year the Canadian Spine Society in conjunction with the Canadian Paediatric Spine Society holds itsAnnual Scientific Conference.This year, because of the COVID-19 pandemic, our meeting will be totally virtual.The format will be a distributed meeting, hosted on the Canadian Spine Society website, with two-and-a-half-hour sessions every Wednesday during February 2021.Each event will include live paper presentations followed by an online question period.There will be a debate between 2 prominent Canadian surgeons on currently controversial subjects with the opportunity for attendees to respond and vote for a winner.We have engaged 4 international keynote speakers who will address topics related to the overarching themes of the conference.E-posters and case studies will be available for viewing and forum discussions will be held throughout the entire month.Our focus will be on degenerative thoracolumbar pathologies, trauma and spinal cord injury, spinal deformity and cervical myelopathy.Topics from 1 week will also be discussed the following week so attendees will have the opportunity to consider additional aspects.As part of these conversation our speakers will touch on spinal metastatic disease, levering expertise in the time of a health care crisis and gender equality in spine care.The Canadian Paediatric Spine Society will hold a symposium on the surgical management of scoliosis in cerebral palsy.This virtual program offers ample opportunity for sufficient professional contact to share ideas and solutions on a wide range of problems.Our platform has been specifically designed to create a comfortable and extended interaction between clinicians and other interested professionals.It will engage our membership and visitors with our exhibitors in a collegial atmosphere that enhances knowledge sharing and discourages aggressive marketing.Although our Annual Scientific Conference must be a totally virtual experience, it remains the most important spine meeting in Canada.

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