Hemivertebra Resection in Small Children. A Literature Review.

STUDY DESIGN: Systematic review. OBJECTIVE: To evaluate the lowest possible age to resect an HV in very young patients with a congenital deformity. METHODS: We sought to retrieve all studies reporting age at HV excision in patients with congenital scoliosis. Studies written in English were included. No publication date restrictions were imposed. A search of the PubMed and LiLacs databases was conducted. Additionally, a hand search was performed to supplement the database search. RESULTS: We found 140 articles. Twenty two studies were included into the final assessment. There was considerable heterogeneity in the included studies, both regarding age and the surgical techniques used. There was also a broad spectrum of recommendations regarding suggested age for treatment. The youngest patient undergoing resection and fusion was 3 months of life at the time of surgery. CONCLUSION: How young a patient could and should be submitted to HV resection surgery is still a matter of debate in the literature. Prophylactic surgery might be a proper treatment for young children with congenital scoliosis before malformation becomes a deformity, adding no additional neurological, vascular, or anesthesia-related complications. The defect can be treated early while the deformity is treated late.

Evaluation of outpatient halo-gravity traction in patients with severe scoliosis: development of a monitoring device.

INTRODUCTION: Patients with severe spinal deformities represent a major clinical and surgical challenge. Halo-gravity traction (HGT) is a traditional method to correct the deformity prior to surgery. Typically, children undergoing HGT remain in the hospital until surgery. Therefore, it has been suggested to treat these children at lower level healthcare centers or even at home. The aim of this study was to develop a tool to assess patient adherence to HGT together with a program to analyze traction results. MATERIALS AND METHODS: An original recording system was designed with an Arduino Nano®. The data extracted from the memory card were compiled into a text file and then analyzed with the MatLab R2018a MathWorks®. RESULTS: Five patients receiving HGT for severe scoliosis were asked to use the device both in the wheelchair and in bed to evaluate its usefulness. CONCLUSIONS: A device was developed to monitor the use of HGT at home. The device provides information on the time of HGT use and the traction weight placed throughout the day, as well as on the correct functioning of the system in bed and in the wheelchair.

Sistema de barras magnéticas. Resultados y complicaciones / Magnetically-controlled growing rods. Outcomes and complications

Introducción: El uso del sistema de barras magnéticas para el tratamiento de la escoliosis de comienzo temprano es un método utilizado en los últimos 10 años; su eficacia está respaldada por la bibliografía, pero no está exento de complicaciones. Objetivo: Analizar retrospectivamente una serie de 37 pacientes tratados con barras magnéticas en escoliosis de comienzo temprano. Materiales y Métodos: Se realizó un estudio retrospectivo entre 2014 y 2019. Se dividió a los pacientes en: grupo 1 (procedimientos primarios con barras magnéticas) y grupo 2 (conversiones de sistema tradicional a barras magnéticas). Resultados: Se incluyó a 19 niñas y 18 niños (edad promedio 8 años al operarse), las etiologías fueron variadas. Entre el grupo 1 (n = 28) y el grupo 2 (n = 9), el seguimiento promedio posoperatorio fue de 3.6 años. El valor angular promedio preoperatorio de escoliosis era de 64° (rango 39°-101°) y el de cifosis, de 51° (rango 7°-81°). El valor angular promedio de escoliosis en el posoperatorio inmediato fue de 41° (rango 17°-80°) y el de cifosis, de 34° (rango 7°-82°). Se produjeron 2 roturas de barra y una cifosis de unión proximal, 2 aflojamientos de tornillos proximales, una falla del sistema de distracción de barras magnéticas y una infección del sitio quirúrgico. Conclusiones: Nuestros resultados preliminares, aunque son a corto plazo, sugieren que la barra magnética podría ser un método eficaz en este tipo de enfermedad. Nivel de Evidencia: IV

Introduction: Magnetic Expansion Control (MAGEC) Spinal Growing Rods are a novel treatment for early-onset scoliosis (EOS). Although its efficacy is supported by the literature, it is not without complications. Materials and Methods: The aim of this study was to retrospectively analyze a series of 37 cases treated with MAGEC between 2014 to 2019. We performed a retrospective study and divided the population into two groups: GI (primary procedures with MAGEC) and GII (conversions from traditional system to MAGEC). Results: The study included 19 girls and 18 boys with a mean age of 8 years and a variety of etiologies. The average postoperative follow-up time for Group I (n=28) and Group II (n=9) was 3.6 years. The average preoperative angular value (AV) of scoliosis was 64° (39°-101°) and kyphosis 51° (7°-81°). The postoperative scoliosis AV was 41° (17°-80°) and kyphosis 34° (7°-82°). We found 2 rod ruptures and one proximal union kyphosis, two proximal screw loosenings, one MAGEC distraction system failure, and one surgical site infection. Conclusions: Although our preliminary results are short term, they suggest that MAGEC could be an effective method. Level of Evidence: IV

Neuromuscular lordoscoliosis: an unusual response to post-operative halo-gravity traction.

PURPOSE: To report the results of prolonged post-operative halo-gravity traction in a patient in whom the surgery had to be interrupted unexpectedly and for whom subsequently specific clinical circumstances contraindicated completion of the surgical procedure. METHODS: The patient was a 15-year-old male with severe cervico-dorsolumbar lordoscoliosis who was being studied for associated diffuse axonal injury. He performed halo-gravity traction for 12 weeks. Subsequent surgical management consisted of occipito-lumbar posterior instrumented fusion. During the surgical approach, electrocardiographic changes with hemodynamic decompensation were detected that did not improve with anesthetic reanimation. The intervention was stopped, the surgical wound was closed, and the patient was transferred to the intensive care unit (ICU). It was decided that a revision surgery with the aim to continue with the previous strategy would imply a high risk of perioperative morbidity and mortality. RESULTS: Orthopedic management was decided upon consisting of continued halo-gravity traction with wheelchair modification at home, which was extended to a period of 12 months because of the good results obtained in terms of cervicothoracic realignment. Two years after halo-gravity discontinuation, clinical and radiographic occipito-cervical alignment was good and the patient conserved certain occipito-cervical range of motion and had the capacity of maintaining a horizontal gaze. CONCLUSION: We considered the outcome extraordinary and relevant in this complex and unusual patient. A longer follow-up will provide more data regarding the final outcome of this treatment.

Protocolo multimodal farmacológico perioperatorio para la cirugía de columna en pediatría / Multimodal perioperative pharmacological protocol in pediatric spine surgery

Introducción: La cirugía de columna es uno de los procedimientos con mayor morbimortalidad dentro de la población pediátrica; el manejo farmacológico del dolor en dicha población aún no se encuentra estandarizado. La analgesia multimodal trata de responder a esta problemática. Objetivo: Sobre la base de una revisión sistemática de la bibliografía, desarrollar un detallado protocolo multimodal farmacológico para el manejo del dolor pre- y posoperatorio intra/extrahospitalario para la cirugía de columna en niños. Materiales y métodos: Se realizó una revisión sistemática de textos completos en inglés o español en PubMed, Embase, Cochrane Library y LILACS Database publicados entre 2000 y 2021; se aplicó el diagrama de flujo PRISMA. Resultados: De 756 artículos preseleccionados, 38 fueron incluidos en la evaluación final. Dada la dificultad bioética de desarrollar trabajos en formato de ensayos clínicos con fármacos y combinaciones de ellos en la población pediátrica, desarrollamos un protocolo detallado de manejo del dolor pre- y posoperatorio por vía intravenosa/oral, intra- y extrahospitalario, para aplicar en niños sometidos a cirugía de columna. Conclusión: Logramos desarrollar un detallado protocolo multimodal farmacológico para el perioperatorio intra- y extrahospitalario de cirugía de columna en niños, sencillo y reproducible, tendiente a acelerar la recuperación funcional del paciente y disminuir los costos socioeconómicos globales. Nivel de Evidencia: II

Introduction: Spine surgery has one of the highest morbimortality rates in the pediatric population. Pain management has not been standardized on said population. Multimodal analgesia (MMA) was developed to resolve that problem. Objective: To develop, based on a systematic review, a detailed and original pain management multimodal pharmacology protocol for pre and post-operative (intra and extra-hospital) periods for the pediatric population undergoing spine surgery. Materials and methods: We conducted a systematic review of full texts in English and Spanish from PubMed, Embase, Cochrane Library, and LiLacs Database from 2000 to 2021. We used the PRISMA flow diagram. Results: From a total of 756 papers, 38 were included in the final evaluation. Considering the bioethical difficulties to develop a manuscript from clinical trials with drugs and drug combinations in the pediatric population, we developed an original and detailed pain management protocol for pre and postoperative (intra and extra-hospital) periods for the pediatric population undergoing spine surgery. Conclusion: Based on a systematic review, we succeeded in developing a simple and easily reproducible perioperative multimodal pain management protocol (intra and extrahospital), intending to expedite the patient's functional recovery and reduce global socioeconomic costs.Keywords: Spine surgery; pediatrics; post-operative pain; multimodal analgesia. Level of evidence: II

Histiocytosis in the pediatric spine: a clinical and radiographic analysis of 50 patients.

STUDY DESIGN: Descriptive, retrospective. Scientific level of evidence IV. OBJECTIVES: The aim of this study was to evaluate a consecutive case series of 50 pediatric patients with LCH of the spine. Langerhans cell histiocytosis (LCH) is a rare disease characterized by abnormal proliferation of Langerhans cells in different organs. Incidence in children range from 2 to 10 cases per million. In the current literature, few series evaluate LCH in the pediatric spine. MATERIAL AND METHODS: A consecutive case series of 50 pediatric patients with LCH of the spine treated at our hospital between 1984 and 2016, with a follow-up of at least 2 years, was analyzed. Sex, age, clinical and radiographic presentation, number of lesions, treatment, complications, and outcome were assessed. RESULTS: Fifty patients, 26 boys and 24 girls, were evaluated. Mean age was 5 years and 2 months (6 months to 13 years and 3 months). 27 patients had a single spinal lesion while 23 had 2 or more lesions. A total of 100 vertebrae were involved. The thoracic spine was the most affected. The most frequent lesion location was in the vertebral body in 88% of the cases. The symptoms were pain (87%), reduced range of motion, deformity, and neurologic deficit. Biopsy was performed in 48 patients. Thirty-nine patients received medical treatment, 28 used orthoses and six required surgery. Six patients (12%) recurred at a mean of 3 years and 5 months (range 2-12 years). In all cases, neurological symptoms, torticollis, and deformities resolved after medical or surgical treatment. CONCLUSIONS: Because of the variable presentation of the disease, ranging from a solitary isolated vertebral lesion to polyostotic and multisystemic involvement, a multidisciplinary team is required to have an adequate management of these patients and to obtain good results.

Surgical treatment of segmental spinal dysgenesis: a report of 19 cases.

STUDY DESIGN: Retrospective review. OBJECTIVE: To describe clinical presentation, surgical management, long-term results, and complications in patients with segmental spinal dysgenesis (SSD). In addition, we sought to emphasize early surgery for this complex congenital abnormality. SSD is a rare congenital malformation characterized by focal stenosis, spinal subluxation, kyphosis, and absence of the nerve roots. Neurologic function ranges from normal to complete paraplegia. Progression of the deformity and neurologic deterioration is the rule. METHODS: An independent spinal surgeon reviewed the complete records of 19 patients with SSD, between 1998 and 2015 at a single institution. Mean follow-up was 10 years and 6 months (2-14 years). RESULTS: We evaluated 11 males and 8 females, with a mean age of 2 years and 9 months (5 months-15 years). The dysgenetic segment involved an average of 2.9 vertebrae (1-5); the upper thoracic region was most commonly involved in ten cases. Fifteen patients had severe spinal stenosis. 14 patients presented neurological deficits and 15 patients had associated organ and musculoskeletal anomalies.Twenty-seven surgeries were performed, a mean of 1.76 procedures (1-5) to obtain solid fusion. Neurologic function improved in four, deteriorated in three, and remained unchanged in 12 patients Seven complications were recorded. CONCLUSION: We strongly recommend decompression and fusion as soon as possible to preserve or prevent neurologic deterioration. Although challenging, it was possible to achieve a solid instrumented fusion in all cases; however, a high rate of patients may deteriorate or not recover neurological status after surgery. LEVEL OF EVIDENCE: Level IV evidence.

Long-term results of hemivertebra excision: How does the spine behave after the peak of puberty?

INTRODUCTION: Early hemivertebra (HV) excision and posterior spinal fusion (PSF) is advocated as the treatment of choice in congenital kyphoscoliosis. We assessed global spinal balance and spinal deformity status once the pubertal peak has taken place, in children with a history of HV excision and PSF at age younger than 5 years. METHODS: Twenty-seven children with congenital kyphoscoliosis without co-existing proximal/distal congenital spinal abnormalities who underwent HV excision and PSF of ≤ 5 levels at age younger than 5 years and who had reached the peak of puberty at the last follow-up visit were evaluated. RESULTS: Twenty-seven HV excision were performed. Mean age at surgery was 3 years and 2 months. A mean of 3.2 segments were fused. Imbalance of the trunk was observed in 80% of thoracic and 75% of thoracolumbar HV excision. No arthrodesis technique (4 cases) presented 100% of spine decompensation. All children younger than 2 years at the time of surgery developed spinal imbalance. Eighteen patients (67%) had global spine imbalance; 81% male population and 63% of the female population. Mean age at surgery was 3 years + 2 months. Mean age of the patients at the time of the study was 15 years + 5 months. Mean follow-up was 12 years + 3 months. CONCLUSION: Many of these patients developed spinal imbalance and scoliosis worsened at the final follow-up. Early age at surgery, preoperative scoliosis severity, HV location, no arthrodesis technique, and the adding-on phenomenon may be involved.

Selective Fusion in Lenke 1 B/C: Before or After Menarche?

STUDY DESIGN: A retrospective, comparative study. OBJECTIVE: To determine the radiological behavior of the lumbar curve in selective fusions in premenarchal girls with adolescent idiopathic scoliosis (Lenke 1 B/C). METHODS: A retrospective, comparative study was conducted. Selective fusion was performed in 21 patients younger than 18 years. The patients were divided into 2 groups: group A, after menarche (n = 12) and group B, before menarche (n = 9). Angles (preoperative, and at 1 and 2 years postoperatively) of the fused thoracic curves and the corresponding lumbar curves were measured and compared. For statistical analysis, the t test was used with a significance level of P < .05. RESULTS: Mean preoperative angle value of the proximal/main thoracic curve was 61° in group A and 57° in group B (P = .44), and 21° and 20°, respectively, in the first year postoperatively (P = .61). Mean preoperative angle value of the lumbar curve was 43° in group A and 42° in group B (P = .87), while at 1 year after surgery, this curve was 19° in both groups (P = 0.91), and at 2 years postoperatively, the curve was 16° in group A and 17° in group B (P = .75). CONCLUSIONS: Over a 2-year follow-up, we did not find significant radiological differences in lumbar curves between patients who underwent surgery before and after menarche.

Infection Recurrence in Instrumented Spinal Fusion in Children.

STUDY DESIGN: Level 4 retrospective case series. OBJECTIVES: Surgical site infection (SSI) is one of the main complications of instrumented spinal fusion. The aim of our study was to evaluate infection recurrence (same bacteria) or reinfection (different bacteria) in posterior spinal fusion in children. METHODS: A retrospective study was conducted to evaluate patients who were successfully treated for SSI after instrumented spinal fusion due to deformity, with irrigation and debridement (I&D) procedures, followed by antibiotic therapy, with a follow-up of at least 2 years. RESULTS: Overall, 29 patients with a mean age of 14 + 3 years were evaluated. Preoperative diagnosis was nonidiopathic scoliosis in 23, idiopathic scoliosis in 5, and Scheuermann's disease in 1 patient. The etiology was Gram-positive cocci (40.9%), Gram-negative bacilli (27.2%), and polymicrobial infection (31.8%). A mean of 1.5 (1-3) I&D procedures were performed. Intravenous antibiotic treatment was given for a mean of 15.8 (4-86) days, followed by oral treatment for a mean of 335.1 (0-1095) days. Mean follow-up was 5 + 2 years (2 to 14 + 7 years) during which 28 patients were cured (96.6%) and 1 patient developed reinfection (3.4%). This reinfection was treated with oral clindamycin for 6 months. After the infection persisted, the decision was to remove the implants. CONCLUSIONS: In this series of 29 pediatric patients who underwent instrumented spinal fusion due to deformity, we reported one case of reinfection (3.4%). Given that 96.6% of infections were resolved, we suggest treatment with I&D procedures with retention of implants to treat acute SSI.

Técnica de "slalom" quirúrgico en estenosis de canal lumbar multinivel. Serie de casos tratados de manera simultánea con descompresión endoscópica y tubular con asistencia microscópica bilateral / Slalom Technique as a treatment in multilevel lumbar spinal stenosis. Series of cases treated simultaneously with endoscopic and tubular decompression with microscopic assistance

Introducción: La laminectomía unilateral para descompresión bilateral por abordaje único ha tomado relevancia en pacientes con estenosis multinivel. Cuando se realiza en más de un nivel por un abordaje único, de manera alterna y de forma cruzada, al abordaje anterior es conocida como técnica de "slalom". Elobjetivode este artículo es presentar una serie de casos tratados con la técnica de "slalom" con asistencia endoscópica y microscópica bilateral, simultánea, en pacientes con estenosis de canal lumbar multinivel.materiales y métodos: Análisis retrospectivo de pacientes tratados de forma simultánea, entre enero de 2017 y enero de 2018, todos operados por el mismo equipo quirúrgico con separadores tubulares, y asistencia endoscópica y micros-cópica simultánea.Resultados: Se incluyó a 4 hombres, con una edad promedio de 73.5 años y patología lumbar multinivel. Se descomprimieron 10 segmentos (2,5 media de niveles por paciente), con un tiempo quirúrgico promedio de 107 minutos. No hubo complicaciones asociadas y los pacientes recibieron el alta hospitalaria el día de la cirugía.Conclusiones:La técnica de "slalom" mínimamente invasiva resulta ser un procedimiento muy eficaz para resolver síntomas de estenosis multinivel asociada a una técnica combinada bilateral con dos equipos quirúrgicos para el tratamiento de este tipo de pacientes. Nivel de Evidencia: IV

Introduction: Unilateral laminectomy for bilateral decompression (ULBD) by single approach has become relevant in patients with multilevel stenosis, when it is performed at more than one level with single approach, alternately and crosswise to the previous approach is known as a slalom technique.The objective of the following work is to present a series of cases treated with the slalom technique with bilateral endoscopic and microscopic assistance, simultaneous in patients with multilevel lumbar canal stenosis. Materials and Methods: Retrospective analysis of patients treated simultaneously between the months of January 2017 to January 2018, all operated by the same surgical team with tubular separators and simultaneous endoscopic and microscopic assistance. Results: Four patients, all male, with an average age of 73.5 years with multilevel lumbar pathology, were included. In total 10 segments were decompressed (2.5 average level for patients), with an average surgery of 107 minutes. No associated complications, with hospital discharge within the day of surgery. Conclusions: The minimally invasive Slalom technique turns out to be a very effective procedure to resolve symptoms of multilevel stenosis associated with a bilateral combined technique with two surgical teams, resulting in a viable option for the treatment of this type of patient. Level of Evidence: IV

Descompresión lumbar en pacientes con enfermedad de Parkinson: serie de casos tratados con cirugía mínimamente invasiva / Lumbar decompression in patients with Parkinson's disease: series of cases treated with minimally invasive surgery

Introducción: La enfermedad de Parkinson afecta principalmente a personas >65 años. El cuadro degenerativo lumbar en el contexto de un canal estrecho sumado a la alteración neuromuscular y la mala calidad ósea, favorece al desequilibrio sagital y coronal. Los pacientes que necesitan cirugía tienen altas tasas de revisión y reoperación con técnicas instrumentadas y no ins-trumentadas. El objetivo de este estudio fue evaluar la técnica quirúrgica de descompresión mínimamente invasiva en pacientes con enfermedad de Parkinson y dolor radicular o claudicación neurogénica en los miembros inferiores. materiales y métodos: Se evaluó a pacientes con diagnóstico de canal lumbar estrecho y enfermedad de Parkinson tratados quirúrgicamente. El procedimiento se indicó por síntomas de canal estrecho o estenosis foraminal de causa degenerativa. Todos fueron tratados con una cirugía descompresiva a través de una hemilaminectomía mínimamente invasiva mediante retracción tubular y asistencia con microscopia. Resultados: De enero de 2015 a diciembre de 2017, se trató a 6 pacientes con enfermedad de Parkinson y canal lumbar estrecho. Se descomprimieron 12 niveles en total, todos estuvieron internados <24 h. No se necesitaron transfusiones, no hubo complicaciones asociadas, el tiempo promedio de cirugía fue de 120 minutos. El seguimiento mínimo fue de 12 meses, los síntomas no reaparecieron. Conclusiones: La elevada tasa de complicaciones en pacientes operados con enfermedad de Parkinson y la disminución de las complicaciones en este estudio sugieren que la cirugía mínimamente invasiva de columna lumbar debería ser una alternativa quirúrgica en estos pacientes. Nivel de Evidencia: IV

Introduction: Parkinson's disease mainly affects patients aged 65 and older. The degenerative condition at the lumbar spine in the context of a narrow canal added to the neuromuscular disorder and poor bone quality favors sagittal and coronal imbalance. Patients who need surgery have high rates of revision and reoperation with instrumented and non-instrumented techniques. The objective of this study was to evaluate the minimally invasive surgical decompression technique in patients with Parkinson's disease and radicular pain or neurogenic claudication in the lower limbs. Materials and Methods: Surgically treated patients with a diagnosis of lumbar spinal stenosis and Parkinson's disease were evaluated. The indication for the procedure was due to symptoms of the lumbar or foraminal stenosis of degenerative cause. All the patients were treated with decompressive surgery through a minimally invasive hemilaminectomy using tubular retraction and assistance with microscopy. Results: From January 2015 to December 2017, 6 patients with Parkinson's disease and lumbar spinal stenosis were treated. A total of 12 segments were decompressed, all patients were hospitalized for less than 24 hours. They did not require a transfusion nor suffered associated complications, with an average surgery time of 120 minutes. All with a minimum follow-up of 12 months and no relapse of the symptoms. Conclusion: The high rate of surgical complications in patients with Parkinson's disease, in contrast to the low rate of complications in the present study, suggests that minimally invasive surgery of the lumbar spine should be a surgical alternative in these patients. Level of Evidence: IV

Crecimiento guiado con barras magnéticas en pacientes con escoliosis de inicio temprano. Reporte preliminar / Guided growth with magnetic rods in early onset scoliosis. Preliminary report

Introducción: El tratamiento de las escoliosis de inicio temprano guiado con barras magnéticas permite realizar distracciones no invasivas y ambulatorias. El objetivo de este estudio fue evaluar nuestra primera serie de casos con escoliosis de inicio temprano tratados con el sistema de barras magnéticas. Materiales y Métodos: Se realizó una revisión de casos tratados con el sistema de barras magnéticas entre 2014 y 2018. Se formaron dos grupos: grupo I (procedimientos primarios con barras magnéticas) y grupo II (conversiones de sistema tradicional a barras magnéticas). Resultados: Se evaluó a 19 pacientes. La edad promedio en el momento de la cirugía era de 7 años y 4 meses, con un seguimiento promedio de 2 años y 7 meses. El grupo I tenía 12 pacientes y el grupo II, 7 pacientes. Los valores angulares promedio preoperatorio y posoperatorio inmediato de la escoliosis fueron 62° y 42°, respectivamente; los de cifosis, 49° y 34°, respectivamente. La distancia T1-T12 fue de 160 a 176 mm. La distancia T1-S1 fue de 285 a 317 mm. Hubo una complicación: protrusión del implante e infección, y fue necesario retirar el material (grupo II). Conclusiones: Los resultados preliminares sugieren que es un método seguro y eficaz. Si bien los resultados a corto y mediano plazo son alentadores, persisten algunos desafíos importantes e incógnitas en relación con el comportamiento mecánico del implante en un seguimiento prolongado. Nivel de Evidencia: IV

Introduction: Early onset scoliosis (EOS) treatment with the magnetically controlled growing rod (MCGR) system allows for the use of non-invasive outpatient distractions. The purpose of this study was to assess our first series of EOS patients treated with MCGRs. Materials and methods: We conducted a review of EOS cases treated with MCGRs between 2014 and 2018. The study population was divided into two groups: Group I, patients undergoing primary MCGR insertion; Group II, patients undergoing conversion from conventional growth system to MCGR. Results: The study population consisted of 19 patients. The average age at the time of surgery was 7 years and 4 months, with an average post-operative follow-up of 2 years and 7 months. Group I consisted of 12 patients and Group II of 7 patients. The mean preoperative scoliosis angle was 62° and immediate postoperatively was 42°. The mean preoperative kyphosis angle was 49°and immediate postoperatively was 34°. The average preoperative T1-T12 length was 160mm and immediate postoperatively was 176mm. The average preoperative T1-S1 length was 285mm and immediate postop-eratively was 317mm. There was 1 late complication, an implant protrusion with an associated infection, in a neuropathic scoliosis patient (Group II) who required implant removal. Conclusion: Our preliminary results suggest that the MCGR system is a safe and effective method. Although the short- and medium-term results are encouraging, further studies are warranted to overcome important and unknown challenges regarding the mechanical behavior of the implant in the long term. Nivel de Evidencia: IV

Aneurysmal Bone Cysts of the Spine in Children: A Review of 18 Cases.

STUDY DESIGN: Retrospective study. OBJECTIVE: The aim of this study was to evaluate the clinical presentation, treatments, outcome, complications, and recurrence rate in the surgical and nonsurgical management of spinal aneurysmal bone cyst (ABC) in a series of 18 pediatric patients. METHODS: Between 1988 and 2014, we evaluated 18 pediatric patients diagnosed with ABC confirmed by pathology studies. We analyzed clinical and radiological features, non-surgical and surgical treatment, outcome, and complications. RESULTS: The series included 12 male and 6 female patients with a mean age of 10 years and 4 months, with a mean follow-up of 5 years. Location of the ABC was lumbar in 8, cervical in 7, thoracic in 2, and sacral in 1 case. Axial pain was the most common symptom followed by radicular involvement. Surgery was performed in the presence of spine instability or neurological involvement (tumor resection) and in the remaining, nonsurgical treatment (percutaneous intralesional injection of methylprednisolone and calcitonin). Recurrence was observed in 4 patients requiring reintervention. There were no procedure-related complications. CONCLUSION: In patients without neurological involvement or spinal instability, nonsurgical treatment is the treatment of choice. Total or subtotal removal combined with posterior instrumented spinal fusion is recommended in cases with a neurological deficit. Both procedures have shown good long-term results.

Hemorragia subaracnoidea posterior a descompresión Lumbar mínimamente invasiva. Presentación de un caso y revisión de la literatura / Subarachnoid hemorrhage after minimally invasive lumbar decompression. Case report and literature review

Introducción: Las lesiones durales son complicaciones frecuentes en la cirugía de columna. La fuga de liquidocefalorraquideo (LCR) puede originar hemorragia en todos los compartimientos del cerebro. La mayoría ocurre en venas ubicadas en región cerebelosa.Material y método: Se presenta un caso de hemorragia subaracnoidea posterior a una descompresión lumbar mínimamente invasiva asociada a desgarro dural. Resultados: Evoluciona en el postoperatorio con síntomas neurológicos de cefaleas y trastornos del sensorio por lo que se decide evaluarlo con estudios por imágenes vasculares cerebrales identificándose sangrado subaracnoideo.Discusión: El sitio más frecuente de hemorragia intracraneal posterior a una cirugía de columna es el cerebelo. El mecanismo de acción de este tipo de sangrados es desconocido y controversial, hay algunos reportes que sugieren que se trataría de un sangrado venoso. El síntoma más característico de este síndrome es la cefalea. Aunque se desconoce la etiología exacta, se postula que la pérdida de volumen de LCR causa una caída en la presión intracraneal, lo que lleva a un agrandamiento de los senos venosos durales que predisponen al paciente a un hematoma subdural espontáneoConclusión: La fuga de LCR, las alteraciones asociadas al edema cerebral en la hipotensión cerebral podría ser llave del mecanismo que desencadena una hemorragia subaracnoidea.

compartments of the brain. Most occur in veins located in the cerebellar region.Material and method: A case of subarachnoid hemorrhage after a minimally invasive lumbar decompression associated with dural tear is presented.Results: It evolves in the postoperative period with neurological symptoms of headaches and sensory disorders, so it is decided to evaluate it with studies by cerebral vascular images identifying subarachnoid bleeding.Discussion: The most frequent site of intracranial hemorrhage after spinal surgery is the cerebellum. The mechanism of action of this type of bleeding is unknown and controversial, there are some reports that suggest that it would be a venous bleeding. The most characteristic symptom of this syndrome is headache. Although the exact etiology is unknown, it is postulated that the loss of CSF volume causes a drop in intracranial pressure, which leads to an enlargement of the dural venous sinuses that predispose the patient to a spontaneous subdural hematomaConclusion: CSF leakage, alterations associated with cerebral edema in cerebral hypotension could be key to the mechanism that triggers a subarachnoid hemorrhage.

Tasa de infección en 212 pacientes consecutivos tratados mediante descompresión tubular mininvasiva de la columna lumbar / Infection rate in 212 consecutive patients treated by minimally invasive lumbar tubular decompression

Introducción: Las infecciones del sitio quirúrgico pueden requerir tratamientos prolongados con antibióticos, una estancia hospitalaria más prolongada y operaciones repetidas. Las incisiones pequeñas y la posibilidad de evitar la disección subperióstica en la cirugía mininvasiva pueden reducir, al mínimo, el riesgo de infecciones posoperatorias. Sin embargo, los estudios publicados sobre infecciones después de procedimientos mininvasivos son escasos. El objetivo de este estudio fue evaluar retrospectivamente una serie de pacientes operados, de manera consecutiva, con una técnica mininvasiva y la incidencia de infección posoperatoria. Materiales y Métodos: Se incluyó a los pacientes sometidos a cirugía lumbar posterior con retractores tubulares y microscopio, en nuestro Servicio, entre enero de 2015 y enero de 2018. Los procedimientos realizados fueron discectomías tubulares, descompresiones para la estenosis de canal y resecciones de quistes sinoviales. La incidencia de infección del sitio quirúrgico se calculó y comparó con el rango de tasas de infección del sitio quirúrgico publicado. Resultados: Se realizaron cirugías no instrumentadas (discectomías, descompresiones) en 212 pacientes. La media de la edad era de 62.4 años y la relación hombre:mujer, de 1,27:1. Solo un paciente sufrió una infección del sitio quirúrgico, diagnosticada el día 9 poscirugía, que fue tratada mediante lavado y limpieza de la herida. Conclusión: La tasa de infección fue del 0,47%. La cirugía mininvasiva puede disminuir notablemente la tasa de infección del sitio quirúrgico y puede ser una herramienta eficaz para reducir, al mínimo, los costos hospitalarios. Nivel de Evidencia: IV

Introduction: Surgical site infections (SSI) can lead to prolonged antibiotic treatments, increased hospital stays, and repeated operations. Small incisions and the possibility of avoiding subperiosteal dissection in minimally invasive surgery can minimize the risk of postoperative infections. However, there is a shortage of literature on infections after mini-invasive procedures. Objective: To evaluate retrospectively a series of patients consecutively operated on with minimally invasive technique and the incidence of postoperative infection. Materials and Methods: All patients undergoing posterior lumbar surgery with tubular retractors and microscope in our department from January 2015 to January 2018 were included. The procedures performed included tubular discectomies, lumbar stenosis decompressions, and synovial cyst resections. The incidence of postoperative SSIs was calculated and compared with the literature range for SSI rates. Results: A total of 212 patients underwent non-instrumented surgeries (discectomies, decompressions). The mean age was 62.4 years with a male:female ratio of 1.27:1. Only one patient had SSI, which was diagnosed on day 9 and treated by reoperation, surgical toilet of the wound, and antibiotic therapy. Conclusion: The infection rate was 0.47%. Minimally invasive surgery can significantly reduce the SSI rate and can be an effective tool in minimizing hospital costs. Level of Evidence: IV

Scoliosis in spinal muscular atrophy: is the preoperative magnetic resonance imaging necessary?

PURPOSE: To determine the prevalence of intraspinal alterations in scoliosis due to Spinal Muscular Atrophy (SMA). METHODS: Cross-sectional, observational, descriptive study. Fifty-six patients with SMA diagnosis required surgical treatment due to scoliosis. INCLUSION CRITERIA: scoliosis/kyphoscoliosis > 50 degrees in the coronal plane, clinical characteristics of Spinal Muscular Atrophy, accurate diagnosis by means of molecular or genetic study. Prior to the spinal surgery, and to find related intraspinal alterations, MRI of the spine and posterior cranial fossa was performed. RESULTS: Forty females, 16 males, mean age 11 years (range 6-14 years). 94% of the patients had Spinal Muscular Atrophy type 2. The mean angle value was 81 degrees (range 53-122 degrees) in the coronal plane and 62 degrees (range 35-80 degrees) in the sagittal plane. The prevalence of intraspinal alterations was 1.78%. One patient with cervical hydromyelia and no neurological surgical procedure prior to the spinal deformity surgery was reported. CONCLUSIONS: In the context of preoperative planning and strategy of patients with scoliosis due to Spinal Muscular Atrophy, MRI may have not to be requested.

Antibiotic prophylaxis in high-risk pediatric spine surgery: Is cefazolin enough?

STUDY DESIGN: Retrospective study. OBJECTIVE: To describe pathogens found in SSI during pediatric-instrumented spine surgery, and to assess the relationship between pathogens and the etiology of the spinal deformity. Surgical site infection (SSI) after pediatric spine fusion is a well-known complication with incidence rates between 0.5 and 42%, associated with the patient underlying disorder. Pathogens involved in SSI seem to be related to patient characteristics, such as the etiology of the spinal deformity. GNB (gram-negative bacilli) are more frequent in neuropathic, muscular, and syndromic conditions. High-risk pediatric patients with a spine deformity undergoing instrumented surgery might benefit from receiving perioperative intravenous prophylaxis for GNB. METHODS: We conducted a retrospective study at our tertiary-care pediatric hospital from January 2010 to January 2017. We reviewed records of all episodes of SSI that occurred in the first 12 months postoperatively. All patients who underwent instrumented spine surgery were included in this study. RESULTS: We assessed 1410 pediatric-instrumented spine surgeries; we identified 68 patients with deep SSIs, overall rate of 4.8%. Mean age at instrumented spine surgery was 12 years and 9 months. Time elapsed between instrumented surgery and debridement surgery was 28.8 days. Cultures were positive in 48 and negative in 20. Of the 48 positive culture results, 41 (72%) were GNB, 12 (21%) gram-positive cocci (GPC), three (5%) gram-positive anaerobic cocci (GPAC), and one (2%) coagulase-negative staphylococci (CoNS). Of the 68 patients with primary SSIs, 46 were considered to have a high risk of infection, which reported GNB in 81%, GPC in 15%, GPAC in 2%, and CoNS in 2%. CONCLUSION: Cefazolin prophylaxis covers GPC and CoNS, but GNB with unreliable effectiveness. Gram-negative pathogens are increasingly reported in SSIs in high-risk patients. Adding prophylaxis for GNB in high-risk patients should be taken into account when considering spine surgery. LEVEL OF EVIDENCE: IV.

Proximal junction kyphosis after posterior spinal fusion for early-onset scoliosis.

STUDY DESIGN: Retrospective study. OBJECTIVE: The aim of this study was to assess the presence of proximal junctional kyphosis (PJK) in our population of children with early-onset scoliosis (EOS) and to identify the predisposing factors for the development of PJK in the postoperative period after posterior spinal fusion (PSF). Few studies have been conducted to evaluate the incidence of proximal junction kyphosis (PJK) in children after early-onset scoliosis (EOS) after posterior spinal fusion (PSF). MATERIALS AND METHODS: Overall, 114 pediatric patients aged < 10 years who underwent surgery for scoliosis or kyphoscoliosis at a single center between 2013 and 2015 were evaluated. Forty-five patients submitted to PSF of five or more levels met the inclusion criteria. The sample included 12 female and 10 male patients. Mean age at surgery was 7 years and 8 months. RESULTS: PJK was observed in 22 patients (48.9%). Overall, the mean proximal junctional angle at 12 and 36 months was 17.1° and 22°, respectively. The uppermost instrumented vertebra (UIV) with the highest PJK rate was T6-T7. The lowest instrumented vertebra (LIV) with the highest PJK rate was L2. Etiology was idiopathic in 4, neuromuscular in 11, congenital in 14, and syndromic in 16. According to underlying disorder, prevalence of PJK was 78% in those with a congenital, 50% in those with a syndromic, 12% in those with idiopathic, and 9% in those with a neuromuscular EOS. Surgical revision rate was 4% (one patient). Mean postoperative follow-up was of 3 years and 4 months (range 3-4 years and 1 month). CONCLUSION: Congenital and syndromic etiology, but not age at PJK onset or sex of the patient, significantly affected the incidence rate of PJK. The UIV with the highest PJK rate was T6-T7 and the LIV with the highest PJK rate was L2. The patients had a low surgical revision rate. LEVEL OF EVIDENCE: Level IV.

Inpatient versus outpatient halo-gravity traction in children with severe spinal deformity.

STUDY DESIGN: A retrospective, comparative study. OBJECTIVE: To compare the results, complications, and costs of preoperative halo-gravity traction in in- and outpatient settings. BACKGROUND DATA: Surgical management of severe spinal deformities remains complex and controversial. Preoperative halo-gravity traction results in a decreased need for aggressive surgical techniques, lower incidence of intraoperative neurologic complications, and improvement of nutritional parameters and preoperative cardiopulmonary function. METHODS: Twenty-nine patients younger than 18 years with kyphoscoliosis undergoing preoperative halo-gravity traction were divided into two groups: inpatients (n: 15) and outpatients (n: 14, home care or care at the Foundation). Traction time (weeks), traction weight (kg), radiographic curve correction, complications, and costs were compared. For statistical analysis, t test and odds ratio were calculated with a significance of p < 0.05. RESULTS: Mean traction time was 6 weeks for in- and 4 weeks for outpatients (p = 0.038). Initial traction weight was 6 kg in both groups, while final traction weight was 13 kg for in- and 15 kg for outpatients (p = 0.50). At the end of the traction period, coronal correction was 24° in in- and 28° in outpatients (p = 0.5), while sagittal correction was 27° and 29°, respectively (p = 0.80). Pin loosening was observed in 2 patients in each group, of whom 1 outpatient developed pin-site infection. In each group, one patient developed transient neurologic complications (odds ratio 1.091). Mean treatment cost per patient was 2.8-fold higher in inpatients. CONCLUSIONS: Considering complications and costs, our results show that preoperative halo-gravity traction in an outpatient setting is an option to be taken into account. LEVEL OF EVIDENCE: Grade III.