087 Multi-Level Tandem Spondylolisthesis Associated with Reduced “Safe Zone” for Lateral Lumbar Interbody Fusion at L4-5

088 Comparing Patient-Reported Outcomes in Patients Undergoing Lumbar Fusion for Isthmic Spondylolisthesis with Predominant Back Pain versus Predominant Leg Pain Symptoms

139 Predictive Factors of Pain and Functional Outcome 5-years following Total Hip Arthroplasty: A Prospective Cohort Study

153 Impact of Mental Health Scores on Clinical Outcomes in Cervical Disc Replacement

193 Unilateral Cervical Spine Facet Fractures: Radiographic Predictors of Instability