Freehand Juxtapedicular Screws Placed in the Apical Concavity of Adult Idiopathic Scoliosis Patients: Technique, Computed Tomography Confirmation, and Radiographic Results

Objective The purpose of this study is to highlight our technique for freehand placement of juxtapedicular screws along with intraoperative computed tomography (CT) and radiographic results. Methods Consecutive patients with adult idiopathic scoliosis undergoing primary surgery by the senior author were identified. All type D (absent/slit like channel) pedicles were identified on preoperative CT. Three-dimensional visualization software was used to measure screw angulation and purchase. Radiographs were measured by a fellowship trained spine surgeon. The freehand technique was used to place all screws in a juxtapedicular fashion without any fluoroscopic, radiographic, navigational or robotic assistance. Results Seventy-three juxtapedicular screws were analyzed. The most common level was T7 (9 screws) on the left and T5 (12 screws) on the right. The average medial angulation was 20.7° (range, 7.1°–36.3°), lateral vertebral body purchase was 13.4 mm (range, 0–28.9 mm), and medial vertebral body purchase was 21.1 mm (range, 8.9–31.8 mm). More than half (53.4%) of the screws had bicortical purchase. Two screws were lateral on CT scan, defined by the screw axis lateral to the lateral vertebral body cortex. No screws were medial. There was a difference in medial angulation between screws with (n = 58) and without (n = 15) lateral body purchase (22.0±4.9 vs. 15.5±4.5, p < 0.001). Three of 73 screws were repositioned after intraoperative CT. There were no neurovascular complications. The mean coronal cobb corrections for main thoracic and lumbar curves were 83.0% and 80.5%, respectively, at an average of 17.5 months postoperative. Conclusion Freehand juxtapedicular screw placement is a safe technique for type D pedicles in adult idiopathic scoliosis patients

The Effect of Parkinson’s Disease on Patients Undergoing Lumbar Spine Surgery

Study Design. Retrospective Database Analysis. Objective. The purpose of this study was to assess characteristics and outcomes of patients with Parkinson’s disease (PD) undergoing lumbar spine surgery for degenerative conditions. Methods. The Nationwide Inpatient Sample was examined from 2002 to 2011. Patients were included for study based on ICD-9-CM procedural codes for lumbar spine surgery and substratified to degenerative diagnoses. Incidence and baseline patient characteristics were determined. Multivariable analysis was performed to determine independent risk factors increasing incidence of lumbar fusion revision in PD patients. Results. PD patients account for 0.9% of all degenerative lumbar procedures. At baseline, PD patients are older (70.7 versus 58.9, p<0.0001) and more likely to be male (58.6% male, p<160.0001). Mean length of stay (LOS) was increased in PD patients undergoing lumbar fusion (5.1 days versus 4.0 days, p<0.0001) and lumbar fusion revision (6.2 days versus 4.8 days, p<180.0001). Costs were 7.9% (p<0.0001) higher for lumbar fusion and 25.2% (p<0.0001) higher for lumbar fusion revision in PD patients. Multivariable analysis indicates that osteoporosis, fluid/electrolyte disorders, blood loss anemia, and insurance status are significant independent predictors of lumbar fusion revision in patients with PD. Conclusion. PD patients undergoing lumbar surgery for degenerative conditions have increased LOS and costs when compared to patients without PD

"Disruptive Technology" in Spine Surgery and Education: Virtual and Augmented Reality

BACKGROUND: Technological advancements are the drivers of modern-day spine care. With the growing pressure to deliver faster and better care, surgical-assist technology is needed to harness computing power and enable the surgeon to improve outcomes. Virtual reality (VR) and augmented reality (AR) represent the pinnacle of emerging technology, not only to deliver higher quality education through simulated care, but also to provide valuable intraoperative information to assist in more efficient and more precise surgeries. OBJECTIVE: To describe how the disruptive technologies of VR and AR interface in spine surgery and education. METHODS: We review the relevance of VR and AR technologies in spine care, and describe the feasibility and limitations of the technologies. RESULTS: We discuss potential future applications, and provide a case study demonstrating the feasibility of a VR program for neurosurgical spine education. CONCLUSION: Initial experiences with VR and AR technologies demonstrate their applicability and ease of implementation. However, further prospective studies through multi-institutional and industry-academic partnerships are necessary to solidify the future of VR and AR in spine surgery education and clinical practice