Pharmacokinetics of intra-articular buprenorphine in horses with lipopolysaccharide-induced synovitis.

The objective of this study was to describe the pharmacokinetics of intra-articular (IA) administered buprenorphine in horses with lipopolysaccharide (LPS)-induced synovitis. Radiocarpal synovitis was induced in six healthy adult horses with the IA injection of LPS (0.5 ng/joint) on two occasions in a randomized cross-over design. Treatments (IA buprenorphine (IAB) at 5 µg/kg plus intravenous saline; and intravenous buprenorphine (IVB) at 5 µg/kg plus IA saline) were administered 4 h following LPS injection. Concentrations of buprenorphine were assessed in plasma and synovial fluid (SF) at 0.5, 2, 6, 12, and 24 h after administration. Pharmacokinetic parameters after IVB and IAB in plasma and synovial fluid were calculated using a nonlinear mixed effects model. IAB was detectable in SF of all horses at 24 h [median concentration of 6.2 (3.46-22.6) ng/mL]. IAB resulted in a median plasma concentration of 0.59 (0.42-1.68) ng/mL at 0.5 h and was detectable in all subjects for up to 6 h and in two horses for up to 12 h. IVB resulted in SF concentrations detected up to 6 h in all horses [median concentration of 0.12 (0.07-0.82) ng/mL]. Results suggest that IA buprenorphine remains present in the inflamed joint for at least 24 h and systemic absorption occurs.

Buprenorphine has a concentration-dependent cytotoxic effect on equine chondrocytes in vitro.

OBJECTIVE: To investigate the cytotoxic effects of 2 different concentrations of buprenorphine and compare them with bupivacaine and morphine on healthy equine chondrocytes in vitro. SAMPLE: Primary cultured equine articular chondrocytes from 3 healthy adult horses. PROCEDURES: Chondrocytes were exposed for 0 and 2 hours to the following treatments: media (CON; negative control); bupivacaine at 2.2 mg/mL (BUPI; positive control); morphine at 2.85 mg/mL (MOR); buprenorphine at 0.12 mg/mL (HBUPRE); or buprenorphine at 0.05 mg/mL (LBUPRE). Chondrocyte viability was assessed using live/dead staining, water-soluble tetrazolium salt-8 (WST-8) cytotoxic assay, LDH assay, and flow cytometry. All continuous variables were evaluated with a mixed ANOVA with treatment, time, and their interactions as the fixed effects and each horse as the random effect. RESULTS: Buprenorphine showed a concentration-dependent chondrotoxic effect. The viability of chondrocytes was significantly decreased with exposure to HBUPRE and BUPI compared to CON, MOR, and LBUPRE. CLINICAL RELEVANCE: Negligible chondrotoxic effects were observed in healthy cultured equine chondrocytes exposed to 0.05 mg/mL of buprenorphine, whereas higher concentrations (0.12 mg/mL) showed a marked cytotoxic effect. Based on these results, low concentrations of buprenorphine appear to be safe for intra-articular administration. Further evaluation of this dose in vivo is needed before recommending its clinical use.

Transforaminal Endoscopic Discectomy Combined With an Interspinous Process Distraction System for Spinal Stenosis.

BACKGROUND: The combination of the percutaneous transforaminal endoscopic decompression (PTED) with an interspinous process distraction system (IPS) may offer additional benefit in the treatment of spinal stenosis in patients who have failed nonsurgical treatment. METHODS: We retrospectively reviewed the medical records of 33 patients diagnosed with lumbar stenosis and radiculopathy and treated them with transforaminal endoscopic lumbar decompression between 2013 and 2017. Primary outcome measures were modified Macnab as well as preoperative and postoperative visual analog scale (VAS) criteria and the Oswestry Disability Index (ODI). Only patients with a minimum follow-up of 2 years were included. RESULTS: A total of 28 patients were treated with a combination of PTED and percutaneous IPS (group A), and 5 patients were treated with PTED and mini-open IPS (group B). In group A patients, there was a 4.48 reduction in the VAS score. The ODI changed from 50.25 preoperatively to 18.2 postoperatively, and excellent and good Macnab outcomes were obtained in 78% of patients. In group B patients, the mean VAS reduction was 5.2 points. The ODI changed from 44.34 preoperatively to 14.62 postoperatively, and 80% of group B patients achieved excellent and good Macnab outcomes. No complications related to PTED or IPS were observed throughout the 2-year follow-up. CONCLUSIONS: The addition of IPS to the PTED procedure in select patients may offer additional benefits to patients being treated for lumbar lateral stenosis and foraminal stenosis with low-grade spondylolisthesis. LEVEL OF EVIDENCE: 3. CLINICAL RELEVANCE: Feasibility study.

Surgical treatment of cervical radiculopathy using an anterior cervical endoscopic decompression.

BACKGROUND: Anterior endoscopic cervical decompression with discectomy and foraminotomy is an alternative to open surgical treatment of unrelenting cervical radiculopathy (CR) in patients who have failed non-operative treatment. The purpose of the study is to present the clinical outcomes of patient with CR treated with an anterior endoscopic approach. METHODS: We reviewed the medical records of 293 patients diagnosed with CR and treated with an anterior endoscopic cervical decompression between 1997 and 2018. Primary outcome measures were modified Macnab as well as pre- and postoperative visual analog scale (VAS) criteria. RESULTS: The average surgical time was 65 minutes. At 12 months follow-up, Excellent and Good Macnab outcomes were achieved in 90.1% of patients. The average VAS score reduction was 5.6. Complications occurred in 8 patients and were treated with a second procedure in 10 patients. CONCLUSIONS: The anterior endoscopic cervical decompression is an attractive alternative to open anterior cervical discectomy and fusion (ACDF) with a low complication and reoperations rate.

Surgeon training and clinical implementation of spinal endoscopy in routine practice: results of a global survey.

BACKGROUND: Training of spine surgeons may impact the availability of contemporary minimally invasive spinal surgery (MIS) to patients and drive spine surgeons' clinical decision-making when applying minimally invasive spinal surgery techniques (MISST) to the treatment of common degenerative conditions of the lumbar spine. Training requirements and implementation of privileges vary in different parts of the world. The purpose of this study was to analyze the training in relation to practice patterns of surgeons who perform lumbar endoscopic spinal surgery the world over. METHODS: The authors solicited responses to an online survey sent to spine surgeons by email, and chat groups in social media networks including Facebook, WeChat, WhatsApp, and Linkedin. Surgeons were asked the following questions: (I) please indicate your training? (II) What type of MISST spinal surgery do you perform? (III) How would you rate your experience in MIS lumbar spinal surgery and what percentage of your practice is MISST? And (IV) which avenue did you use to train for the MISST you currently employ in your clinical practice today? Descriptive statistics were applied to count responses and cross-tabulated them to the surgeon's training. Pearson Chi-square measures, kappa statistics, and linear regression analysis of agreement or disagreement were performed by analyzing the distribution of variances using statistical package SPSS version 25.0. RESULTS: A total of 430 surgeons accessed the survey. The completion rate was 67.4%. Analyzing the responses of 292 surveys submitted by 97 neurosurgeons (33.2%), 161 orthopaedic surgeons (55.1%), and 34 surgeons of other postgraduate training (11.6%) showed that only 14% (41/292) of surgeons had completed a fellowship. Surgeons rated their skill level 33.5% of the time as master and experienced surgeon, and 35.6% of the time as novice or surgeon with some experience. There were more master (64.6% versus 29.2%) and experienced (52% versus 40%) surgeons amongst orthopaedic surgeons than amongst neurosurgeons at a statistically significant level (P=0.11). There were near twice as many orthopaedic surgeons (54.3%) using endoscopic procedures in the lumbar spine as their favorite MISST than neurosurgeons (35.4%; P=0.096). Endoscopic spine surgeons' main sources of knowledge acquisition were (I) learning in small meetings (57.3%), (II) attending workshops (63.1%), and (III) national and international conferences (59.8%). CONCLUSIONS: The majority of spine surgeons reported more than half of their cases employing MISST at a high skill level. Very few MISST surgeons are fellowship trained but attend workshops and various meetings suggesting that many of them are self-thought. Orthopaedic surgeons were more likely to implement endoscopic spinal surgery into the routine clinical practice. As endoscopic spine surgery gains more traction and patient demand, minimal adequate training will be part of the ongoing debate.

Surgeon motivation, and obstacles to the implementation of minimally invasive spinal surgery techniques.

BACKGROUND: This study aimed to analyze the motivators and obstacles to the implementation of minimally invasive spinal surgery techniques (MISST) by spinal surgeons. Motivators and detractors may impact the availability of MISST to patients and drive spine surgeons' clinical decision-making in the treatment of common degenerative conditions of the lumbar spine. METHODS: The authors solicited responses to an online survey sent to spine surgeons by email, and chat groups in social media networks including Facebook, WeChat, WhatsApp, and Linkedin. Descriptive statistics were employed to count the responses and compared to the surgeon's training. Kappa statistics and linear regression analysis of agreement were performed. RESULTS: A total of 430 surgeons accessed the survey. The completion rate was 67.4%. A total of 292 surveys were submitted by 99 neurosurgeons (33.9%), 170 orthopaedic surgeons (58.2%), and 23 surgeons of other postgraduate training (7.9%). Personal interest (82.5%) and patient demand (48.6%) were the primary motivators for MISST implementation. High equipment (48.3%) and disposables (29.1%) cost were relevant obstacles to MISST implementation. Local workshops (47.6%) and meetings in small groups (31.8%) were listed as the primary knowledge sources. Only 12% of surgeons were fellowship trained, but 46.3% of surgeons employed MISST in over 25% of their cases. CONCLUSIONS: The rate of implementation of MISST reported by spine surgeons was found to be high but impeded by the high cost of equipment and disposables. The primary motivators for spine surgeons' desire to implement were personal interest and patient demand.

Regional variations in acceptance, and utilization of minimally invasive spinal surgery techniques among spine surgeons: results of a global survey.

BACKGROUND: Regional differences in acceptance and utilization of MISST by spine surgeons may have an impact on clinical decision-making and the surgical treatment of common degenerative conditions of the lumbar spine. The purpose of this study was to analyze the acceptance and utilization of various minimally invasive spinal surgery techniques (MISST) by spinal surgeons the world over. METHODS: The authors solicited responses to an online survey sent to spine surgeons by email, and chat groups in social media networks including Facebook, WeChat, WhatsApp, and Linkedin. Surgeons were asked the following questions: (I) Do you think minimally invasive spinal surgery is considered mainstream in your area and practice setting? (II) Do you perform minimally invasive spinal surgery? (III) What type of MIS spinal surgery do you perform? (IV) If you are performing endoscopic spinal decompression surgeries, which approach do you prefer? The responses were cross-tabulated by surgeons' demographic data, and their practice area using the following five global regions: Africa & Middle East, Asia, Europe, North America, and South America. Pearson Chi-Square measures, Kappa statistics, and linear regression analysis of agreement or disagreement were performed by analyzing the distribution of variances using statistical package SPSS Version 25.0. RESULTS: A total of 586 surgeons accessed the survey. Analyzing the responses of 292 submitted surveys regional differences in opinion amongst spine surgeons showed that the highest percentage of surgeons in Asia (72.8%) and South America (70.2%) thought that MISST was accepted into mainstream spinal surgery in their practice area (P=0.04) versus North America (62.8%), Europe (52.8%), and Africa & Middle East region (50%). The percentage of spine surgeons employing MISST was much higher per region than the rate of surgeons who thought it was mainstream: Asia (96.7%), Europe (88.9%), South America (88.9%), and Africa & Middle East (87.5%). Surgeons in North America reported the lowest rate of MISST implementation globally (P<0.000). Spinal endoscopy (59.9%) is currently the most commonly employed MISST globally followed by mini-open approaches (55.1%), and tubular retractor systems (41.8%). The most preferred endoscopic approach to the spine is the transforaminal technique (56.2%) followed by interlaminar (41.8%), full endoscopic (35.3%), and over the top MISST (13.7%). CONCLUSIONS: The rate of implementation of MISST into day-to-day clinical practice reported by spine surgeons was universally higher than the perceived acceptance rates of MISST into the mainstream by their peers in their practice area. The survey suggests that endoscopic spinal surgery is now the most commonly performed MISST.

Standalone lordotic endoscopic wedge lumbar interbody fusion (LEW-LIF™) with a threaded cylindrical peek cage: report of two cases.

We report two cases of a standalone lordotic endoscopic wedge lumbar interbody fusion (LEW-LIF™) with a stress-neutral non-expandable cylindrical threaded polyether ether ketone (PEEK) interbody fusion implant. Patients underwent full-endoscopic transforaminal decompression and fusion for symptomatic lateral recess stenosis due to disc herniation, and hypertrophy of the facet joint complex and ligamentum flavum and no more than grade I spondylolisthesis. Lumbar interbody fusion with cages traditionally calls for posterior supplemental fixation with pedicle screws for added stability. A more simplified version of lumbar decompression and fusion without pedicle screws would allow treating patients suffering from stenosis and instability induced sciatica-type low back and leg pain in an outpatient ambulatory surgery center setting (ASC). This would realize a significant reduction in cost as well as the burden to the patient with decreased postoperative pain and earlier return to function. A 62-year-old female patient had surgery at L4/5 for a 6-year history of worsening right sided sciatica-type leg- and low back pain. Another 79-year-old female had the same surgical management at L4/5 for a 5-year history of unrelenting left-sided spondylolisthesis-related symptoms. Both patients had an uneventful postoperative course until the last available follow-up of 24 weeks with greater than 60% VAS and Oswestry disability index (ODI) reductions. There was no evidence of implant expulsion, subsidence, or postoperative instability. We concluded that standalone outpatient lumbar transforaminal endoscopic interbody fusion with a non-expandable threaded cylindrical cage is feasible, and favorable clinical outcomes provide proof of concept to study long-term clinical outcomes in larger groups of patients.

Abordaje interlaminar complementamente endoscópico para hernias centrales extruidas y migradas en L5­S1. Serie de casos / Full-endoscopic interlaminar approach for L5- S1 extruded and migrated central hernias. Case series study

Introducción La cirugía endoscópica de columna ha demostrado ser una opción en el tratamiento de hernias discal y estenosis foraminal. El abordaje más empleado es la vía transforaminal, sin embargo, este abordaje es limitado en casos de hernias discales centrales extruidas y migradas. El abordaje interlaminar completamente endoscópico ha permitido el tratamiento sintomático de hernias discales centrales extruidas y migradas en el nivel L5 ­ S1, además es una novedosa alternativa para la resolución de las dificultades técnicas relacionadas con el abordaje posterolateral en éste nivel. El propósito del estudio es reportar los resultados obtenidos con el abordaje endoscópica interlaminar en el tratamiento de hernias discales centrales extruidas y migradas en dos años de seguimiento. Materiales y métodos Se realizó un estudio retrospectivo observacional descriptivo con las historias de pacientes que presentaron sintomatología radicular secundaria a hernia discal central en el nivel L5 ­ S1 y que fueron tratados con cirugía por abordaje interlaminar completamente endoscópico. Se evaluaron los índices de escala visual análoga (EVA) pre y posoperatorio, el criterio Oswestry ODI y el criterio MacNab. Resultados Entre los años 2008 y 2015 se realizaron un total de 99 procedimientos en el mismo número de pacientes. Todos fueron sometidos a una técnica quirúrgica estándar bajo anestesia local y sedación. La EVA tuvo una reducción de 5,81 puntos. El ODI bajó 45,63%. Y el 88% de los pacientes tuvo una completa satisfacción frente al tratamiento. Discusión Los resultados obtenidos en esta muestra permiten considerar la fragmentectomía interlaminar endoscópica bajo anestesia local y sedación como un procedimiento seguro, preciso y efectivo en la resolución del dolor secundario a hernias discales centrales extruidas y migradas en el nivel L5 ­ S1 que cursan con radiculopatía. El uso de anestesia local y sedación como única alternativa analgésica puede no ser la mejor opción en este tipo de técnicas Nivel de evidencia IV

Background Endoscopic spine surgery has shown to be an option for disc hernias and foraminal stenosis. Although the most used approach is transforaminal, this approach is limited in cases of extruded and migrated central hernias. The full-endoscopic interlaminar approach has led to the treatment of the lumbar pain secondary to extruded and migrated central herniated discs at L5 - S1, and is an alternative for resolving technical difficulties related to the transforaminal approach at this level. The aim of this article is to report the results obtained with a full-endoscopic interlaminar approach for the treatment of central extruded and migrated herniated discs, with a two-year follow-up. Methods A descriptive observational retrospective study was conducted using the records of patients who had a radiculopathy secondary to a central herniated disc at level L5 - S1, and who were treated with a full-endoscopic interlaminar approach. An evaluation was made of the pre-operative and post-operative visual analogue scale (VAS) scores, Oswestry ODI criteria, and MacNab criteria. Results A total of 99 procedures were performed in the same number of patients between 2008 and 2015. All were treated with a standard surgical technique and under local anaesthesia and sedation. The visual analogue score showed a reduction of 5.81 points. The ODI was down 45.63%, and 88% of the patients were completely satisfied with the treatment. Discussion The results lead us to consider that full-endoscopic interlaminar fragmentectomy under local anaesthesia and sedation is a safe, accurate, and effective procedure for the treatment of radiculopathy related to L5 - S1 extruded and migrated central hernia. Use of local anaesthesia and sedation as the only analgesic alternative may not be the best option in this type of technique. Evidence Level IV

Guía de instrucción en habilidades para cirugía artroscópica / Instruction guide: basic skill training for arthroscopic surgery

La evolución de las técnicas quirúrgicas tradicionales y los modelos de formación de los cirujanos exigen cambios, por esta razón el centro de investigación y entrenamiento en cirugía de mínima invasión (CLEMI) ha desarrollado y aplicado modelos de enseñanza que permiten aprender técnicas quirúrgicas mínimamente invasivas como la artroscopia. CLEMI propone un modelo basado en simulación impartido en un ambiente controlado, estructurado y progresivo que vaya al ritmo individual de cada uno de los estudiantes. Inicialmente el estudiante encontrará conceptos teóricos de instrumental, equipos y ergonomía, posteriormente en la fase práctica usando un modelo de laparoscopia y finalmente usando un modelo de artroscopia con los que se realizan ejercicios para desarrollar destrezas técnicas. El entrenamiento en modelos bajo ambiente controlado disminuye el período de aprendizaje y eleva la competencia del estudiante. El objetivo principal del curso es alcanzar las habilidades mínimas necesarias para realizar con éxito una artroscopia en el paciente.

The evolution of traditional surgical techniques and training models for surgeons demand changes. For this reason, the Latin-American Centre for training in minimally invasive surgery (CLEMI) has developed and applied teaching models that allow surgeons to learn minimally invasive surgical techniques such as arthroscopy. CLEMI proposes a model based on simulation presented in a controlled, structured, and progressive environment that advances with the individual rhythm of each of the students. Initially, the student uses theoretical instrumental, equipment and ergonomics concepts. Later, in the practical phase, they then carry out exercises using a laparoscopy model and finally an arthroscopy model in order to develop their technical skills.

Guía de instrucción en artroscopia de rodilla nivel intermedio / Instruction guide in knee arthroscopy: Intermediate level

La evolución de las técnicas quirúrgicas tradicionales y los modelos de formación de los cirujanos exigen cambios, por esta razón el centro de investigación y entrenamiento en cirugía de mínima invasión (CLEMI) ha desarrollado y aplicado modelos de enseñanza que permiten entrenar técnicas quirúrgicas mínimamente invasivas como la artroscopia de rodilla. CLEMI propone un modelo basado en simulación impartido en un ambiente controlado, estructurado y progresivo que vaya al ritmo individual de cada uno de los estudiantes. Inicialmente el estudiante encontrará conceptos teóricos de instrumental, equipos y ergonomía, posteriormente en la fase práctica usando un modelo sintético anatómico de la rodilla y finalmente usando un modelo biológico con el que se realizan ejercicios para desarrollar destrezas exigidas por las técnicas quirúrgicas. El entrenamiento en modelos bajo ambiente controlado disminuye el período de aprendizaje y eleva la competencia del estudiante.

Changes are needed due to the evolution of traditional surgical techniques and surgeon training models. For this reason the minimally invasive surgery research and training centre (CLEMI) has developed and applied teaching models to help in the training of minimally invasive surgical techniques, such as knee arthroscopy. CLEMI proposes a model based on simulation taught in a controlled, structured, and progressive environment that is tailored to the individual rhythm of each of the students. Initially, the student will encounter theoretical concepts of instruments, equipment and, ergonomics. Later, in the practical phase, an anatomical synthetic model of the knee will be used in the practical phase, followed by a biological model in order to perform exercises to develop the skills required for the surgical techniques. Training in models under a controlled environment decreases the learning period and increases student skills.

Anterior percutaneous cervical discectomy. two-year follow-up of a blunt technique procedure / Discotomia cervical percutânea anterior. dois anos de acompanhamento de um procedimento com técnica romba / Discectomía cervical anterior percutánea. dos años de seguimiento de una técnica roma

ABSTRACT Objective: To report the outcomes of non-endoscopic percutaneous cervical discectomy by anterior blunt approach for the treatment of degenerative disc disease. Methods: A review of the medical records of patients with axial cervical pain resulting from degenerative disc disease and treated with discectomy and percutaneous nucleoplasty by anterior blunt approach with radiofrequency source was carried out. The data were evaluated according to modified MacNab and pre- and postoperative VAS criteria at 3, 12 and 24 months. Results: Sixty-two procedures were performed in 48 patients between 2008 and 2014. The mean age of the population was 52.4 years. MacNab results were 84.6%, 92.3%, and 89.2% improvement (excellent and good results) at 3, 12 and 24 months, respectively. The VAS changed from 7.4 to 2.3 two years after the procedure, showing a statistically significant difference (p=0.000). There were no major complications or re-interventions related to the technique. Conclusions: Anterior non-endoscopic discectomy and nucleoplasty for the treatment of discogenic axial cervical pain may be an effective alternative to open surgery. In the two-year follow-up, our blunt technique proved to be a safe procedure with no approach-related complications, and provided outcomes comparable to those reported using the original needle technique.

RESUMO Objetivo: Relatar os resultados de discotomia percutânea não endoscópica por acesso anterior rombo para tratamento de doença degenerativa do disco. Métodos: Realizou-se uma revisão dos prontuários clínicos de pacientes com dor cervical axial decorrente de doença degenerativa do disco e tratados com discotomia e nucleoplastia percutâneas não endoscópicas por acesso anterior rombo com fonte de radiofrequência. Os dados foram avaliados de acordo com MacNab modificado e os critérios pré e pós-operatórios da EVA aos 3, 12 e 24 meses. Resultados: Um total de 62 procedimentos foi realizado em 48 pacientes entre 2008 e 2014. A média de idade da população foi de 52,4 anos. Os resultados de MacNab obtidos foram 84,6%, 92,3% e 89,2% de melhora (resultados excelentes e bons) aos 3, 12 e 24 meses, respectivamente. A EVA passou de 7,4 para 2,3 dois anos depois do procedimento, mostrando diferença estatisticamente significante (p = 0,000). Não houve complicações importantes ou reintervenções relacionadas com a técnica. Conclusões: A discotomia e nucleoplastia não endoscópicas anteriores para tratamento da dor cervical axial discogênica podem ser uma alternativa efetiva à cirurgia aberta. Nos dois anos de acompanhamento, nossa técnica romba provou ser um procedimento seguro, sem complicações relacionadas com o acesso e proporcionou resultados comparáveis aos relatados quando se usa a técnica original com agulha.

RESUMEN Objetivo: Reportar los resultados de la discectomía percutánea no endoscópica a través de abordaje anterior romo para el tratamiento de la enfermedad degenerativa del disco. Métodos: Se realizó una revisión de las historias clínicas de los pacientes con dolor cervical axial resultante de enfermedad degenerativa del disco y tratados con discectomía y nucleoplastia percutáneas no endoscópicas por abordaje anterior romo con fuente de radiofrecuencia. Los datos fueron evaluados de acuerdo con MacNab modificado y los criterios pre y postoperatorios de EVA a los 3, 12 y 24 meses. Resultados: Se realizaron un total de 62 procedimientos en 48 pacientes entre 2008 y 2014. La edad promedio de la población fue de 52,4 años. Los resultados de MacNab obtenidos fueron 84,6%, 92,3% y 89,2% de mejora (resultados excelentes y buenos) a los 3, 12 y 24 meses, respectivamente. La EVA cambió de 7,4 a 2,3 dos años después del procedimiento, mostrando diferencia estadísticamente significativa (p = 0,000). No hubo complicaciones importantes o reintervenciones relacionadas con la técnica. Conclusiones: La discectomía y nucleoplastia no endoscópicas anteriores para el tratamiento del dolor cervical axial discogénico pueden ser una alternativa efectiva a la cirugía abierta. En los dos años de seguimiento, nuestra técnica roma demostró ser un procedimiento seguro, sin complicaciones relacionadas con el abordaje y proporcionó resultados comparables a los reportados cuando se usa la técnica original con aguja.

Endoscopic interlaminar discectomy. use of swine cadavers as a training model / Discectomia interlaminar endoscópica. uso de cadáveres de suínos como modelo de treinamento / Discectomía interlaminar endoscópica. uso de cadáveres de cerdos como modelo de entrenamiento

ABSTRACT Objective: To analyze the possibility of using cadavers of pigs for training in endoscopic interlaminar discectomy. Methods: Five young pigs were used. The necessary instruments and equipment were used, and the endoscopic transforaminal and interlaminar percutaneous approach was performed at the L7-S1 level. A specialist surgeon performed the procedure. The points of entry, needle angulation, and subjective technical difficulties indicated by the surgeon were analyzed. Results: The mean weight of pigs was 42.2 kg. The posterolateral (transforaminal) entry point was, on average, 6.28 cm from the midline at an angulation of 32.8°. The posterior (interlaminar) entry point was on average 1.82 cm. Full-endoscopic interlaminar discectomy was possible in all animals of the sample. The structures described in the literature were visible endoscopically in 100% of the models. Conclusions: The demonstrated benefits and increased indications of endoscopic lumbar surgery created the need to establish safer and more efficient training processes. The authors raise the possibility of using experimental models to develop technical skills in endoscopy via interlaminar approach. The use of teaching tools such as animal models constitutes a new learning technique and give more confidence to surgeons. The use of cadavers of pigs, obtained according to ethics, avoids the use of human cadavers, and minimizes the development of the learning curve on patients.

RESUMO Objetivo: Analisar a viabilidade técnica da utilização de cadáveres de suínos para a formação em discotomia interlaminar endoscópica. Métodos: Cinco jovens porcos foram tomados. Usando o conjunto de instrumentos e os equipamentos necessários, foi feita uma abordagem transforaminal percutânea e uma interlaminar endoscópica no nível L7-S1. O procedimento cirúrgico foi realizado por um cirurgião especialista. Pontos de entrada foram analisados, a angulação da agulha e as dificuldades técnicas subjetivas indicados pelo cirurgião. Resultados: O peso médio dos cadáveres de suínos empregados foi de 42,2 Kg. O ponto de entrada transforaminal foi em média de 6,28 centímetros da linha média em um ângulo de 32,8°. O ponto de entrada interlaminar, em média, foi de 1,82 centímetros. O discotomia completamente endoscópica por abordagem interlaminar foi tecnicamente viável em todos signo animal. As estruturas descritas na literatura foram visíveis endoscopicamente em 100% dos modelos. Conclusões: Os benefícios comprovados e indícios crescentes de cirurgia endoscópica criou a necessidade de estabelecer processos mais seguros e eficientes treino. Os autores levantam a possibilidade de utilizar modelos experimentais para o desenvolvimento de competências técnicas na abordagem interlaminar completamente endoscópico. O uso de ferramentas de ensino, tais como modelos experimentais, fornece para o processo de aprendizagem de novas técnicas e permite que os cirurgiões alcançar mais confiança. O uso de carcaças de suínos, feitas eticamente, evita o uso de cadáveres humanos e minimiza o desenvolvimento da curva de aprendizagem em pacientes.

RESUMEN Objetivo: Analizar la posibilidad de emplear cadáveres de cerdos para entrenamiento en la discectomía interlaminar endoscópica. Métodos: Se tomaron cinco cerdos jóvenes. Empleando el instrumental y el equipamiento necesario, se realizó un abordaje endoscópico percutáneo transforaminal y interlaminar en el nivel L7-S1. La técnica quirúrgica fue realizada por un cirujano experto. Se analizaron los puntos de ingreso, la angulación de la aguja y las dificultades técnicas subjetivas indicadas por el cirujano. Resultados: El peso promedio de los cadáveres de cerdos fue de 42,2 Kg. El punto de ingreso posterolateral (transforaminal) estuvo en promedio a 6,28 cm de la línea media con una angulación de 32,8°. El punto de ingreso posterior (interlaminar) en promedio fue 1,82 cm. La discectomía interlaminar completamente endoscópica fue posible en todos los animales de la muestra. Las estructuras descritas en la literatura fueron endoscópicamente visibles en el 100% de los modelos. Conclusiones: Los beneficios demostrados y el aumento de las indicaciones de la cirugía endoscópica lumbar crean la necesidad de establecer procesos de entrenamiento más seguros y eficientes. Los autores plantean la posibilidad de emplear modelos experimentales para desarrollar habilidades técnicas en la endoscopia por abordaje interlaminar. El uso de herramientas educativas como modelos de animales es una nueva técnica de aprendizaje y proporciona más confianza para los cirujanos. La utilización de cadáveres de cerdos, obtenidos de manera ética, evita el uso de cadáveres humanos y minimiza el desarrollo de la curva de aprendizaje sobre pacientes.

Complications of non-endoscopic discectomy: a retrospective study of twenty-one years / Complicações da discotomia não endoscópica: estudo retrospectivo de vinte e um anos / Complicaciones de la discectomía no endoscópica: estudio retrospectivo de veintiún años

ABSTRACT Objective: To report and compare the number and grade of major complications presented with non-endoscopic thermal discectomy and nucleoplasty for the treatment of discogenic axial lumbar pain using laser and radiofrequency. Methods: A 21 years retrospective study was conducted of the clinical charts of patients whose reason for consultation was axial lumbar pain from degenerative disc disease, and who underwent surgery using non-endoscopic discectomy and nucleoplasty (NEDN). Two groups were established; the first, NEDN with laser, and second, NEDN with radiofrequency. The number and types of complications reported in the case-series were counted, and their statistical differences determined. Results: The inclusion criteria were fulfilled by 643 of the medical charts. 26 complications were reported, the most common being radiculitis (n=12). Statistically significant differences were found between the complications occurring in the two groups (p=0.01). Conclusion: The number of complications showed statistically significant difference. The severity of the complications and adverse outcomes provide an argument for choosing one technology over the other. Training and the learning curve stage are important factors to be taken into account, to avoid complications.

RESUMO Objetivo: Relatar e comparar o número e grau das complicações importantes apresentadas com discotomia e nucleoplastia térmica não endoscópica no tratamento da dor lombar axial discogênica usando laser e radiofrequência. Métodos: Estudo retrospectivo de 21 anos, realizado com os prontuários clínicos de pacientes cujo motivo da consulta foi dor lombar axial por doença degenerativa do disco, que foram submetidos a cirurgia empregando discotomia e nucleoplastia não endoscópica (NEDN). Dois grupos foram estabelecidos, o primeiro, NEDN com laser e o segundo, NEDN com radiofrequência. O número e os tipos de complicações relatadas na série de casos foram contabilizados, e suas diferenças estatísticas foram determinadas. Resultados: Os critérios de inclusão foram satisfeitos por 643 prontuários clínicos. Foram relatadas 26 complicações, sendo a mais comum a radiculite (n = 12). Foram encontradas diferenças estatisticamente significativas (p = 0,01) entre as complicações que ocorreram nos dois grupos. Conclusão: O número de complicações mostrou diferença estatisticamente significativa. A gravidade das complicações e os resultados adversos fornecem um argumento para a escolha de uma tecnologia sobre a outra. O treinamento e a curva de aprendizagem são fatores importantes a considerar para evitar complicações.

RESUMEN Objetivo: Relatar y comparar el número y grado de las complicaciones importantes que se presentaron con la discectomía y nucleoplastia térmica no endoscópica para el tratamiento del dolor lumbar axial discogénico utilizando láser y radiofrecuencia. Métodos: Estudio retrospectivo de 21 años de las historias clínicas de pacientes cuyo motivo de consulta fue el dolor lumbar axial debido a enfermedad degenerativa del disco, que fueron sometidos a cirugía mediante discectomía y nucleoplastia no endoscópica (NEDN). Se establecieron dos grupos, el primero, NEDN con láser y el segundo, NEDN con radiofrecuencia. Se contaron el número y los tipos de complicaciones relatadas en la serie de casos, y se determinaron sus diferencias estadísticas. Resultados: Los criterios de inclusión fueron satisfechos por 643 historias clínicas. Se encontraron 26 complicaciones, siendo la más común la radiculitis (n = 12). Se encontraron diferencias estadísticamente significativas entre las complicaciones ocurridas (p = 0,01). Conclusión: El número de complicaciones mostró una diferencia estadísticamente significativa. La gravedad de las complicaciones y los resultados adversos proporcionan un argumento para elegir una tecnología sobre la otra. La capacitación y la curva de aprendizaje son factores importantes a tener en cuenta para evitar complicaciones.

Multispecialty and multilanguage training in spine surgery: A Latin-American experience / Entrenamiento en cirugía de columna en diferentes idiomas y especialidades. Experiencia latinoamericana

OBJECTIVE: To report the experience of minimally invasive spine surgery (MISS) training course in different languages and specialties for Latin American spine surgeons, and on their level of satisfaction with the curriculum. METHODS: A total of 29 hands-on training workshops were conducted over a period of 6 years, on using a MISS technique for degenerative disk disease. The participants completed two questionnaires aimed at evaluating the activities including the methodology, objectives, suitability of facilities, and instruments provided, as well as general satisfaction. Statistical analysis was performed using R 3.1.1 for Windows. Demographic and descriptive statistics were employed. RESULTS: A total of 366 specialists took part and included neurosurgeons, orthopaedists, and anaesthesiologists. The questionnaire was answered by 249 medical doctors from 12 Latin American countries, 98% of which professed to be satisfied with the training activity. CONCLUSIONS: The use of educational tools, such as surgical simulators contributes to the new learning process techniques and adds confidence to the surgeons. The implementation of workshops conducted using strict planning leads to a high level of satisfaction among the participants, thus minimizing the differences between specialties or languages

OBJETIVO: Presentar la experiencia lograda en el entrenamiento en técnicas mínimamente invasivas de columna para cirujanos de toda Latinoamérica con diferentes especialidades e idiomas, y reportar el grado de satisfacción con el currículo implementado. MÉTODOS: Se realizaron un total de 29 entrenamientos durante 6 años en una técnica mínimamente invasiva de columna para el tratamiento de discopatía degenerativa. Los participantes respondieron 2 encuestas con el fin de evaluar el contenido curricular general de la actividad de entrenamiento. Se analizaron las encuestas empleando el programa R 3.1.1 para Windows. RESULTADOS: Un total de 366 especialistas realizaron el entrenamiento. Las especialidades entre los participantes fueron: neurocirujanos, ortopedas y anestesiólogos. Las encuestas fueron contestadas por un total de 249 médicos de 12 países de América Latina. El 98% de los encuestados avaló el modelo educativo y el currículo en general. CONCLUSIONES: El uso de herramientas educativas, como la simulación quirúrgica, contribuye a los procesos de entrenamiento de nuevas técnicas quirúrgicas y permite a los cirujanos lograr confianza para el momento en que tengan que realizarlas. La implementación de talleres de entrenamiento conducidos bajo un plan curricular permite un alto grado de satisfacción en los participantes, y minimiza las diferencias entre especialidades e idiomas

Radiofrequency Neurolysis for Lumbar Pain Using a Variation of the Original Technique.

BACKGROUND: Zygapophysial joint arthrosis is a pathology related with axial lumbar pain. The most accepted treatment, after failure of medical management, is the thermal denervation of the medial branch. Nonetheless, the placement of the heat probe remains a challenge to surgeons, even when using the fluoroscope. Using a variation of Shealy's and Bogduk's original techniques, which includes ablation of the medial branch and the nerves present in the joint capsule, we hypothesize that we can obtain similar outcomes to those found in the literature. OBJECTIVE: To present the results attained over the last 8 years in the treatment of axial lumbar pain from zygapophysial joints degeneration, by employing a variation of the lumbar medial branch neurotomy technique, called 360-degree facet rhizotomy with radiofrequency. STUDY DESIGN: Retrospective evaluation. SETTING: Spine Center - Minimally Invasive Surgery in Bogotá, Colombia. METHODS: A medical chart review was conducted for patients diagnosed with axial lumbar pain from zygapophysial joint arthrosis and treated with 360-degree facet rhizolysis with a high frequency radiofrequency energy source between 2008 and 2014. Data were evaluated under modified MacNab and pre- and postoperative visual analog scale (VAS) criteria. RESULTS: We obtained a total of 73 patients. The average population age was 58.6 years. The preoperative VAS obtained was 7.3, which changed to 1.7 one year after the procedure. The MacNab criteria 12 months after the surgery gave satisfactory outcomes (excellent and good) from 91.7% of the patients. LIMITATIONS: This retrospective study includes inherent limitations and only offers one year follow-up data. CONCLUSIONS: Thermal therapy for zygapophysial joint arthrosis constitutes a safe and effective technique. The one year follow-up data presented here show that the ablation of the medial branch and nerves present in the joint capsule leads to satisfactory results in a high percentage of patients.

Identification of myopia-associated WNT7B polymorphisms provides insights into the mechanism underlying the development of myopia.

Myopia can cause severe visual impairment. Here, we report a two-stage genome-wide association study for three myopia-related traits in 9,804 Japanese individuals, which was extended with trans-ethnic replication in 2,674 Chinese and 2,690 Caucasian individuals. We identify WNT7B as a novel susceptibility gene for axial length (rs10453441, Pmeta=3.9 × 10(-13)) and corneal curvature (Pmeta=2.9 × 10(-40)) and confirm the previously reported association between GJD2 and myopia. WNT7B significantly associates with extreme myopia in a case-control study with 1,478 Asian patients and 4,689 controls (odds ratio (OR)meta=1.13, Pmeta=0.011). We also find in a mouse model of myopia downregulation of WNT7B expression in the cornea and upregulation in the retina, suggesting its possible role in the development of myopia.

Desarrollo de un simulador de bajo costo para la adquisición de destrezas básicas en cirugía artroscópica / Development of a low-cost simulator to acquire basic arthroscopic skills

Introducción: El propósito del estudio fue desarrollar, bajo parámetros de expertos y evaluación de idoneidad por el usuario final, un simulador mecánico de bajo costo, que permita desarrollar destrezas básicas, pero fundamentales, en el aprendizaje de la artroscopia. Materiales y Métodos: El trabajo se dividió en tres fases; en la primera, se encuestaron expertos y se establecieron criterios para el desarrollo del simulador artroscópico. Luego, se desarrolló el prototipo del simulador usando, además de los criterios mencionados, las características del instrumental y los objetivos de cada ejercicio planteado. Por último, se llevaron a cabo pruebas, usando el simulador final, con ortopedistas que realizaron el entrenamiento. Resultados: Se obtuvieron algunos criterios de importancia para el desarrollo del simulador, que se emplearon en el desarrollo del modelo final, cuyo costo estuvo por debajo de los 300 dólares estadounidenses. En cuanto a la aplicación práctica, se obtuvo una satisfacción del 100% y una idoneidad del 97,4% por parte de los ortopedistas que realizaron el entrenamiento. Conclusiones: Desarrollar procesos de entrenamiento es una labor fundamental de los centros de aprendizaje quirúrgico. El simulador ArtroCLEMI II probó ser una herramienta útil en el desarrollo de destrezas básicas de artroscopia, con costos mínimos y alta versatilidad. Es necesario fortalecer los procesos curriculares aplicados a las curvas de aprendizaje quirúrgico.(AU)

Background: The purpose of the study was to develop, within the parameters of experts and specialists, the suitability of a low cost mechanical simulator, which allows developing basic arthroscopy skills. Methods: The methodology was divided into three phases; in the first one, experts were surveyed and criteria were established in the development of an arthroscopic simulator. After that, we developed the prototype of the simulator using, in addition to the above criteria, instrumental characteristics and objectives of each exercise. Finally, tests were performed with orthopedic surgeons using the final simulator. Results: We obtained some important criteria in the development of the simulator, which were used to develop the final model. The cost was less than US$300. In terms of practical application, the rate of satisfaction was 100% and that of suitability was 97.4% according to the orthopedists who conducted the training. Conclusions: To develop training processes is a fundamental task of surgical learning centers. The ArtroCLEMI II simulator proved to be a useful tool in the development of basic skills in arthroscopy with minimal costs and high versatility. It is necessary to strengthen curriculum processes applied to surgical learning curves.(AU)

Desarrollo de un simulador de bajo costo para la adquisición de destrezas básicas en cirugía artroscópica / Development of a low-cost simulator to acquire basic arthroscopic skills

Introducción: El propósito del estudio fue desarrollar, bajo parámetros de expertos y evaluación de idoneidad por el usuario final, un simulador mecánico de bajo costo, que permita desarrollar destrezas básicas, pero fundamentales, en el aprendizaje de la artroscopia. Materiales y Métodos: El trabajo se dividió en tres fases; en la primera, se encuestaron expertos y se establecieron criterios para el desarrollo del simulador artroscópico. Luego, se desarrolló el prototipo del simulador usando, además de los criterios mencionados, las características del instrumental y los objetivos de cada ejercicio planteado. Por último, se llevaron a cabo pruebas, usando el simulador final, con ortopedistas que realizaron el entrenamiento. Resultados: Se obtuvieron algunos criterios de importancia para el desarrollo del simulador, que se emplearon en el desarrollo del modelo final, cuyo costo estuvo por debajo de los 300 dólares estadounidenses. En cuanto a la aplicación práctica, se obtuvo una satisfacción del 100% y una idoneidad del 97,4% por parte de los ortopedistas que realizaron el entrenamiento. Conclusiones: Desarrollar procesos de entrenamiento es una labor fundamental de los centros de aprendizaje quirúrgico. El simulador ArtroCLEMI II probó ser una herramienta útil en el desarrollo de destrezas básicas de artroscopia, con costos mínimos y alta versatilidad. Es necesario fortalecer los procesos curriculares aplicados a las curvas de aprendizaje quirúrgico.

Background: The purpose of the study was to develop, within the parameters of experts and specialists, the suitability of a low cost mechanical simulator, which allows developing basic arthroscopy skills. Methods: The methodology was divided into three phases; in the first one, experts were surveyed and criteria were established in the development of an arthroscopic simulator. After that, we developed the prototype of the simulator using, in addition to the above criteria, instrumental characteristics and objectives of each exercise. Finally, tests were performed with orthopedic surgeons using the final simulator. Results: We obtained some important criteria in the development of the simulator, which were used to develop the final model. The cost was less than US$300. In terms of practical application, the rate of satisfaction was 100% and that of suitability was 97.4% according to the orthopedists who conducted the training. Conclusions: To develop training processes is a fundamental task of surgical learning centers. The ArtroCLEMI II simulator proved to be a useful tool in the development of basic skills in arthroscopy with minimal costs and high versatility. It is necessary to strengthen curriculum processes applied to surgical learning curves.