Faculty Bibliography

OBJECTIVE:By minimizing imaging artifact and particle scatter, carbon fiber-reinforced polyetheretherketone (CF-PEEK) spinal implants are hypothesized to enhance radiotherapy (RT) planning/dosing and improve oncological outcomes. However, robust clinical studies comparing tumor surgery outcomes between CF-PEEK and traditional metallic implants are lacking. In this paper, the authors performed a systematic review of the literature with the aim to describe clinical outcomes in patients with spine tumors who received CF-PEEK implants, focusing on implant-related complications and oncological outcomes. METHODS:A systematic review of the literature published between database inception and May 2022 was performed in accordance with the 2020 Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. The PubMed database was queried using the terms "carbon fiber" and "spine" or "spinal." The inclusion criteria were articles that described patients with CF-PEEK pedicle screw fixation and had a minimum of 5 patients. Case reports and phantom studies were excluded. RESULTS:This review included 11 articles with 326 patients (237 with CF-PEEK-based implants and 89 with titanium-based implants). The mean follow-up period was 13.5 months, and most tumors were metastatic (67.1%). The rates of implant-related complications in the CF-PEEK and titanium groups were 7.8% and 4.7%, respectively. The rate of pedicle screw fracture was 1.7% in the CF-PEEK group and 2.4% in the titanium group. The rates of reoperation were 5.7% (with 60.0% because of implant failure or junctional kyphosis) and 4.8% (all because of implant failure or junctional kyphosis) in the CF-PEEK and titanium groups, respectively. When reported, 72.5% of patients received postoperative RT (41.0% stereotactic body RT, 30.8% fractionated RT, 25.6% proton, 2.6% carbon ion). Four articles suggested that implant artifact was reduced in the CF-PEEK group. Local recurrence occurred in 14.4% of CF-PEEK and 10.7% of titanium-implanted patients. CONCLUSIONS:While CF-PEEK harbors similar implant failure rates to traditional metallic implants with reduced imaging artifact, it remains unclear whether CF-PEEK implants improve oncological outcomes. This study highlights the need for prospective, direct comparative clinical studies.

BACKGROUND:There is controversy as to whether fusions should have the upper instrumented vertebrae (UIV) end in the upper lumbar spine or cross the thoracolumbar junction. This study compares outcomes and reoperation rates for thoracolumbar fusions to the sacrum or pelvis with UIV in the lower thoracic versus lumbar spine to determine if there is an increased reoperation rate depending on UIV selection. METHODS:A retrospective review of prospectively collected data was conducted from a single-center database on adult patients with degeneration and deformity who underwent primary and revision fusions with a caudal level of S1 or ilium between 2012 and 2018. Fusions were classified as anterior, posterior, or combination approach. Revision fusions included patients who had spinal surgery at another institution prior to their revision surgery at the center. Patients were categorized into 1 of 3 groups based on UIV: T9-T11, upper lumbar region (L1-L2), and lower lumbar region (L3-L5). Inclusion criteria were age 18 years or older and at least 1 year of clinical follow-up. Patients were excluded from analysis if they had tumors, infections, or less than 1 year of follow-up after the index procedure. RESULTS:= .002) from the reoperation rates for the same diagnoses in the upper lumbar spine (4.6% and 1%) or lower lumbar spine (6.2% and 0%). A multivariate logistical regression model at 2-year follow up did not show a statistically significant difference between reoperation rates between the thoracic and upper lumbar spine UIV groups. CONCLUSION/CONCLUSIONS:Constructs with UIV in the thoracic spine suffer from higher rates of proximal junctional kyphosis and pseudoarthrosis, whereas those with UIV in the upper lumbar spine have higher rates of adjacent segment disease. Given this tradeoff, there is no certain recommendation on what UIV will result in a lower reoperation rate in thoracolumbar fusion constructs to the sacrum or pelvis. Surgeons must evaluate patient characteristics and risks to make the optimal decision.

OBJECTIVE:Miscommunication and poor coordination among surgical teams are known causes of preventable medical harms and operating room inefficiencies and inhibit surgical training. Technology may help overcome these challenges. This study used the personal experience of one of the authors as a former Air Force F-15 pilot to design a combat aviation pre- and postoperative communication workflow in the neurosurgery department and tested its effect on safety, efficiency, and education. The authors hypothesized that the adoption of this workflow through a tailored technological platform will increase compliance and improve the chances of sustainability. METHODS:Data were prospectively collected from neurosurgery cases before (January-May 2020) and after (June-October 2020) implementation of this workflow. Briefing and debriefing were executed using a custom mobile platform and were defined as nonmandatory for all participants. All faculty and residents who operated at NYU Langone Medical Center (Tisch campus) during the intervention period were enrolled on the platform. Primary outcomes were morbidity and mortality per the department's criteria, and intraoperative last-minute requests as reported by operating room staff in a double-blinded fashion. Secondary outcomes were user responses on the subjective questionnaires. RESULTS:Data were collected from 637 and 893 cases during the preintervention and intervention periods, respectively. The average briefing rates for residents and surgeons were 71% and 81%, respectively, and the average debriefing rates for residents and surgeons were 67% and 88%. There was no significant difference in preoperative risk score between the preintervention and intervention patient populations (p = 0.24). The rate of intraoperative last-minute requests significantly decreased from 16.6% (35/211) to 10.5% (35/334, p = 0.048). There was no significant change in morbidity and mortality between the preintervention and intervention periods. On subjective questionnaires there was a statistically significant improvement in safety, efficiency, and educational aspects of the cases during the intervention period. CONCLUSIONS:Implementation of aviation-like structured team communication practices in the neurosurgery department through a technological platform improved education and communication between surgical teams and led to a reduction in last-minute surgical requests that could impact costs.

Primary low grade central nervous system lymphoma is a rare entity, with the majority being intracranial marginal zone B-cell lymphoma. Primary spinal lymphoma is unusual, and commonly presents as an epidural lesion with diffuse large B-cell histology, as described in prior literature. We present a case of a 56 year-old woman diagnosed with a primary intradural spinal lymphoma two years after a posterior cervical fusion at the same level. She was treated successfully with surgical resection and postoperative radiotherapy. To our knowledge, this is the first case in the literature describing an intradural primary marginal zone B-cell lymphoma of the spine.

OBJECTIVE:Neurofibromatosis type I (NF1) will be associated with hydrocephalus in ≤13% of cases. Currently, very little data are available describing the actual etiologies and treatment options of NF1-associated hydrocephalus. We, therefore, have described our experience in treating NF1-associated hydrocephalus. METHODS:We completed a retrospective data analysis of 1020 patients with NF1 treated at the Gilbert's Israeli International Neurofibromatosis Center during a period of 20 years. The patients presenting with, and treated for, related hydrocephalus were included. The clinical, radiological, and surgical data are presented. RESULTS:We included 22 patients (2.1% of the entire NF1 patient cohort), with 17 aged <19 years. Twenty patients had obstructive hydrocephalus. The most common etiologies included aqueductal or third ventricular obstruction. Of the 22 patients, 15 had underwent endoscopic procedures (14 third ventriculostomies) and 7 had undergone shunt procedures. The corresponding failure rates (including the need for additional cerebrospinal fluid procedures) were 60% and 71%. CONCLUSIONS:Hydrocephalus in the context of NF1 has been caused mostly by obstructive etiologies. A tailored treatment approach is recommended to address the specific etiology. Regardless of the treatment approach, a relatively high rate of failure has been described.

OBJECTIVE:The interhemispheric approach (IA) has been extensively described for treating pathologies located at the lateral or third ventricle, pineal region, and periventricular locations. While these anatomical locations are the target of many pediatric pathologies, very few series have analyzed the morbidity and outcome of the IA in children. The aim of this study is to describe our experience using the IA in children, emphasizing the approach-related morbidity. METHODS:Twenty-six patients underwent 28 procedures using the IA between the years 2012 and 2016. Data for these patients was retrospectively analyzed. Surgical and approach-related morbidity were collected and analyzed. RESULTS:The mean age of the cohort was 10.1 ± 4.2 years and included 15 females (57.7%). Approach-related morbidity occurred following eight surgeries (28.6%; seven with anterior IA and one with posterior IA), including two pseudomeningoceles (7.1%), three persistent subdural effusions (10.7%), of which two were locally drained and one required subduro-peritoneal shunting, one epidural bleed (3.6%) which resolved spontaneously, and two infections (3.6%) treated with antibiotics. Cerebrospinal fluid leaks, supplementary motor area syndrome, seizures, and subdural hematomas did not occur in any of the patients. None of the approach-related complications led to permanent morbidity or to mortality. CONCLUSION:The IA for lesions in and around the ventricular system is feasible and associated with a low permanent complication rate. When choosing this approach, the morbidity, although rarely permanent, should be considered.

BACKGROUND: Hydrocephalus in patients with neurofibromatosis type I (NF1) is usually obstructive, and may arise secondary to tumoral or non-tumoral causes. The treatment of hydrocephalus in these patients is often challenging due to combined pathologies and unique anatomical changes. The use of endoscopic third ventriculostomy (ETV) as treatment has rarely been described in this group. In this study we aimed to characterize the indications, considerations and outcome of ETV in patients with NF1 gathered in a multicenter international cohort. METHODS: Five centers participated in this retrospective study. Following an IRB approval, data and images were collected. Inclusion criteria were patients of all ages with NF1 who underwent an ETV for the treatment of obstructive hydrocephalus. Exclusion criteria were patients who had no post-operative radiological or clinical follow up. ETV failure was defined as recurrent clinical or radiological signs of hydrocephalus. RESULTS: Forty-two patients were included in this study. Common etiologies for hydrocephalus were aqueductal/tectal tumor (31%), aqueductal web (26%), and aqueductal stenosis due to neurofibromatosis related changes (14%). Ten patients had a preoperative diagnosis of optic pathway glioma. Six patients were defined as ETV failure within 1 month, 3 more within 9 months and 1 more within 4 years. ETV was defined as successful in 32 patients (76%) with a mean follow up of 59.4 +/- 50.9 months (4 months - 15 years). CONCLUSION: ETV is a safe treatment for selected patients with NF1 and obstructive hydrocephalus. Individual anatomical and pathological aspects should be taken into consideration.