Triple nerve transfers for the management of early unilateral facial palsy.

BACKGROUND: Early onset facial paralysis is usually managed with cross-face nerve grafts, however the low number of axons that reach the target muscle may result in weakness or failure. Multiple-source innervation, or 'supercharging', seeks to combine the advantages of different donor nerves while minimizing their weaknesses. We propose a combination of cross-face nerve grafts with local extra-facial nerve transfers to achieve earlier facial reanimation in our patients. METHODS: A retrospective cohort including all patients with early unilateral facial palsy (<12 months evolution) who underwent triple nerve transfer between 2019 and 2021 was conducted. We performed single-stage procedure including zygomatic-to-zygomatic and buccal-to-buccal cross-face grafts, a nerve-to-masseter to bucozygomatic trunk transfer, and a mini-hypoglossal to marginal branch transfer. Results were evaluated using the clinician-graded facial function scale (eFACE). RESULTS: Fifteen patients were included (eight females, seven males), mean age at the time of surgery was 48.9 ± 13.3 years. Palsy was right-sided in eight cases. The mean time from palsy onset to surgery was 5.5 ± 2.8 months. Patients showed improvement in static (70.8 ± 21.9 vs. 84.15 ± 6.68, p = 0.002) and dynamic scores (20 ± 16.32 vs. 74.23 ± 7.46, p < 0.001), as well as periocular (57.33 ± 15.23 vs. 74 ± 7.18, p = 0.007), smile (54.73 ± 11.93 vs. 85.62 ± 3.86, p < 0.001), mid-face (46.33 ± 18.04 vs. 95 ± 7.21, p < 0.001) and lower face scores (67.4 ± 1.55 vs. 90.31 ± 7.54, p < 0.001). CONCLUSION: The triple nerve transfer technique using cross-face nerve grafts, the nerve-to-masseter, and the hypoglossal nerve, is an effective and reproducible technique to obtain middle and lower face reanimation in cases of early facial palsy.

Craniofacial Fibrous Dysplasia: Surgical Management and Long-Term Outcomes at a Referral Center in Mexico City.

Background Craniofacial fibrous dysplasia (CFD) is an uncommon benign condition in which a bone is replaced by fibrous tissue. An adequate clinical characterization considering the number of affected bones and functional impairment is important to determine the most effective surgical intervention for its management. This study aims to present our institution's experience in the evaluation and management of CFD. Methods This was a retrospective study that included patients with CFD managed at our institution. Data included demographic characteristics, afflicted bones, surgical procedures performed, and recurrence. Results are presented as mean and percentages. Recurrence-free years and association between the type of surgery and recurrence was evaluated. Results Eighteen patients were included (11 females, 61%). The zygomatic, maxillary, and frontal bones were the most commonly affected with eight (18%) cases each. The most common procedure was bone burring, with 36 procedures. Recurrence was more prevalent after burring (58.3%) and occurred earlier than in the bone resection group (13 vs. 15 years, p > 0.05). Conclusion Surgery continues to be the cornerstone of CFD treatment. Bone burring is effective for debulking and contouring but increases the risk for recurrence. An individualized approach should be tailored according to the anatomical location of the disease, type of CFD, behavior of the lesion, and accompanying clinical complaints.

Dynamic reanimation of severe blepharoptosis using the neurotized omohyoid muscle graft.

BACKGROUND: Attempts at dynamic reconstruction of the upper eyelid either by neurotization or direct muscle replacement have been scarce. Substitution of the levator palpebrae superioris muscle requires the use of extremely small and pliable structures. As a proof of concept/pilot study, we present a consecutive series of patients who underwent blepharoptosis correction using the neurotized omohyoid muscle graft. METHODS: Retrospective analysis of patients receiving a neurotized omohyoid muscle graft for levator palpebralis substitution between January and December 2019. RESULTS: Five patients were operated (2 male, 3 female); median age was 35.5 years. Median palpebral aperture was 0 mm and levator function was< 1 mm in all cases. Median denervation time for the levator muscle was 9 years. All surgeries were uneventful, and no postoperative complications were seen. Twelve months after the procedure, all patients presented with adequate palpebral aperture on activation of the spinal nerve. Median palpebral aperture was 6.5 mm Postoperative electromyography revealed muscle contraction when stimulation was applied to the spinal nerve. CONCLUSION: This study introduces the concept of severe blepharoptosis correction using the omohyoid muscle. We believe that with time and further technical refinements it could become an invaluable tool in eyelid reconstruction surgery.

Development and Implementation of an Aesthetic Surgery Fellowship After Residency: The Universidad La Salle/Hospital Angeles Experience.

BACKGROUND: Postgraduate training in plastic surgery is heterogeneous between countries, with exposure to aesthetic surgery being a reflection of this. Fellowships in Mexico have usually consisted of tutorial teaching, providing graduates with experience but a lack of formal structure. The aim of his work is to present a University-backed program focused on aesthetic surgery and propose the expansion of this kind of program. METHODS: A retrospective cross-sectional review of surgical cases was performed over a five-year period from 2015 to 2019. Data were obtained from the senior surgeon's practice charts. Information was recorded using a data sheet including patients' demographic characteristics, procedures performed and type of anesthesia applied. Descriptive analyses of patient demographic and clinical characteristics were performed. Continuous variables are expressed in central tendency measures, and categorical values are presented as percentages. RESULTS: 1282 procedures were performed on 885 patients, 797 females (90%) and 88 males (10%). Mean age was 44.6 ± 13.8 years. Case load consisted in 545 breast procedures (42.5%), 372 body contour surgeries (29.0%), 305 facial aesthetic procedures (23.8%) and 60 miscellaneous procedures (4%). The most common surgeries were breast augmentation (249, 19.4%), alloplastic breast reconstruction (165, 12.8%), blepharoplasty (163, 12.7%), liposuction (151, 11.7%), and abdominoplasty (107, 8.3%). CONCLUSIONS: A University backed program focused on aesthetic surgery is feasible and desirable in multiple national and international institutions. LEVEL OF EVIDENCE V: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Effect of Liposuction on Body Weight and Serum Concentrations of Leptin, Lipids, Glucose, and Insulin: A Meta-Analysis.

BACKGROUND: Abdominal obesity has been associated with an increased risk of insulin resistance, metabolic syndrome, and diabetes. Central fat removal procedures such as liposuction, lipectomy, and abdominoplasty are among the most common surgical procedures. The impact of the latter on the former is controversial and understudied. The authors aimed to explore the effect of subcutaneous fat elimination procedures on insulin resistance measures and adipokine levels. METHODS: Relevant studies regarding the effects of surgical subcutaneous fat removal on glucose, insulin, adipokines, and lipid metabolism, as well as blood pressure, were identified by searching PubMed and Ovid-Cochrane without limits in date, type of publication, or language. After the selection process, 24 studies were obtained. The results of the articles were summarized using descriptive statistics. For the final analysis, a randomized effects model was used to evaluate heterogeneity; averages and meta-analytic differences were expressed with a confidence interval of 95%. RESULTS: All studies reported a reduction in weight (-2.64 kg; 95% CI, -4.32 to -0.96; P = 0.002; I 2 = 36%; P of I 2 < 0.001) and body mass index after liposuction. A significant improvement in triglycerides (-10.06 mg/dL; 95% CI, -14.03 to -6.09; P < 0.001; I 2 = 48%; P of I 2 = 0.05), serum glucose concentration (-4.25 mg/dL; 95% CI, -5.93 to -2.56; P < 0.001; I 2 = 68%; P of I 2 < 0.001), serum insulin concentration (-2.86 µIU/mL; 95% CI, -3.75 to -1.97; P < 0.001; I 2 = 59%; P of I 2 = 0.003), and serum leptin concentration (-7.70 ng/mL; 95% CI, -11.49 to -3.92; P = 0.0001; I 2 = 96%; P of I 2 < 0.001) was consistently observed. CONCLUSION: In addition to weight loss, there is a significant decrease in leptin, triglyceride, glucose, and insulin serum concentrations after liposuction, a fact that should be considered in future discussions.

Prevalence of Hand Malformations in Patients With Moebius Syndrome and Their Management.

BACKGROUND: Moebius syndrome is a disorder characterized by facial and abducens nerve paralysis. Patients can present a wide range of upper extremity malformations. Literature focused on orthopedic manifestations of Moebius syndrome shows variability in the prevalence and clinical presentation of upper extremity anomalies. The aim of this work is to evaluate the prevalence of upper extremity malformations in patients with Moebius syndrome, clarify its various clinical presentations, and present treatment strategies for their management. METHODS: This is a retrospective, cross-sectional study including patients with Moebius syndrome and upper extremity malformations between 2012 and 2019. Data include demographic characteristics, Moebius syndrome subtype, type of malformation, affected extremity, and surgical procedures underwent. Quantitative data were recorded as mean (standard deviation [SD]), and qualitative data were expressed in terms of totals and percentages. Statistical association between Moebius syndrome subtype and development of upper extremity anomalies was evaluated using binary logistic regression. RESULTS: Twenty-five out of 153 patients (16.3%) presented upper extremity malformations (48% male). Mean age of presentation was 9.08 ± 9.43 years. Sixty-eight percent of the malformations were unilateral. The most common presentations included Poland syndrome and simple syndactyly with 8 cases each (32%), followed by 5 cases of brachysyndactyly (20%), 3 cases of amniotic band syndrome (12%), and 1 case of cleft hand (4%). No statistical association was found between Moebius syndrome subtype and odds ratio for development of upper extremity anomalies. Thirteen patients (52%) underwent reconstructive procedures. CONCLUSION: Poland syndrome and syndactyly are the most common anomalies in patients with Moebius syndrome. Patients may present with a wide range of hand malformations, each patient should be carefully evaluated in order to determine whether surgical treatment is needed and to optimize rehabilitation protocols.

Facial paralysis, etiology and surgical treatment in a tertiary care center in plastic and reconstructive surgery in Mexico.

BACKGROUND: Facial paralysis is a frequent disabling entity that causes a negative impact on the cosmetic, functional, social, psychological and economic aspects of the patient. Surgical treatment aims to restore the patient to her previous life with the fewest possible sequelae. OBJECTIVE: Describe the experience of surgical management and propose a treatment algorithm. METHOD: A retrospective study was carried out from 2017 to 2019 of the records of patients with facial nerve involvement. The variables were age, sex, etiology, affected side and procedures performed. RESULTS: 108 patients were obtained. The most frequent cause was development facial paralysis (41,8%), followed by resection of intracranial tumors (29%). A total of 225 procedures were performed, average per patient of 2.7. The most performed dynamic procedure was the gracilis-free flap (59%). The most frequent static procedures were the placement of a gold weight (24%) and the recreation of the nasogenian sulcus (13%). CONCLUSIONS: The surgical treatment algorithm will depend on the evolution time, etiology, donor nerves and state of the facial musculature. The gracilis-free flap continues to be the gold standard procedure in facial paralysis reconstruction. Static procedures are additionally required to achieve a satisfactory aesthetic and functional result.

ANTECEDENTES: La parálisis facial es una afección incapacitante que con frecuencia causa un impacto negativo en los aspectos cosméticos, funcionales, sociales, psicológicos y económicos. El tratamiento quirúrgico tiene como objetivo mejorar la calidad de vida dejando la menor cantidad posible de secuelas. OBJETIVO: Describir la experiencia del manejo quirúrgico y proponer un algoritmo de tratamiento. MÉTODO: Se realizó un estudio retrospectivo, de 2017 a 2019, de los expedientes de pacientes con afección del nervio facial. Las variables consideradas fueron la edad, el sexo, la etiología, el lado afectado y los procedimientos quirúrgicos realizados. RESULTADOS: Se obtuvieron 108 pacientes y la causa más frecuente fue la parálisis facial del desarrollo sindrómica (42%), seguida de la resección de tumores intracraneales (29%). Se realizaron 225 procedimientos, con un promedio de 2.7 por paciente. El procedimiento dinámico más realizado fue el colgajo libre de gracilis (59%). Los procedimientos estáticos más frecuentes fueron la colocación de una pesa de oro (24%) y la recreación del surco nasogeniano (13%). CONCLUSIONES: La secuencia del tratamiento quirúrgico dependerá del tiempo de evolución, la etiología, los nervios disponibles y el estado de la musculatura facial. El colgajo libre de gracilis continúa siendo el procedimiento de elección en la reconstrucción de la parálisis facial. Adicionalmente se requieren procedimientos estáticos para lograr un resultado estético y funcional satisfactorio.

Lower extremity nerve injuries and their management at a referral center in Mexico City.

OBJETIVO: Describir el manejo de las lesiones nerviosas de extremidad inferior atendidas en un centro de referencia en cirugía plástica y reconstructiva en la Ciudad de México. MÉTODO: Estudio descriptivo, transversal y retrospectivo, en el que se evaluaron los expedientes clínicos de pacientes atendidos por lesiones nerviosas de extremidad inferior entre 2010 y 2018. RESULTADOS: Se incluyeron 21 pacientes, 14 hombres (66.6%) y 7 mujeres (33.3%), con una edad promedio de 30.00 ± 8.89 años. Las lesiones en la extremidad derecha fueron más prevalentes (52.3%). El mecanismo de lesión más común fue por herida por proyectil de arma de fuego (28.5%) o por accidente automovilístico (13.6%). Los nervios más afectados fueron el ciático (38.0%) y el peroneo (38.0%), seguidos por el tibial (9.5%), el peroneo y el tibial simultáneamente (9.5%) y el femoral (4.7%). Las medidas de tratamiento más empleadas fueron las transferencias nerviosas (7 casos, 33.3%) y la aplicación de injertos nerviosos para el manejo de brechas (7 casos, 33.3%). CONCLUSIONES: La reparación de las estructuras nerviosas de la extremidad inferior ha recibido poca atención. Sin embargo, nuestro estudio muestra que es posible aplicar diversas estrategias reconstructivas microquirúrgicas, buscando mejorar los desenlaces funcionales de los pacientes. OBJECTIVE: To describe the management of lower extremity nerve injuries at a plastic and reconstructive surgery referral center in Mexico City. METHOD: A descriptive, transversal and retrospective study was performed, evaluating clinical records of patients with lower extremity nerve injuries managed in our center between 2010 and 2018. RESULTS: Twenty-one patients were included, 14 males (66.6%) and 7 females (33.3%); mean age was 30.00 ± 8.89 years. Right-sided injuries were more prevalent (52.3%). The most common etiologies were gunshot injuries (28.5%) and motor vehicle accidents (13.6%). The most frequently affected nerves were the sciatic (38.0%) and the peroneal nerves (38.0%), followed by the tibial (9.5%), simultaneous tibial and peroneal nerve injury (9.5%) and the femoral nerve (4.7%). Nerve transfers (7 cases, 33.3%) and autologous nerve grafts (7 cases, 33.3%) were the preferred surgical techniques for injury management. CONCLUSIONS: Repair of lower extremity nerve injuries has not been popularized, however our study shows that several microsurgical reconstructive strategies are available in order to improve functional outcomes.

Cephalometric Analysis of the Craniofacial Morphology in Patients With Moebius Syndrome.

BACKGROUND: Patients with Moebius syndrome may present a wide range of associated orofacial malformations, however, their craniofacial morphology has not been established via controlled cephalometric studies. OBJECTIVE: To present our institution's findings in the cephalometric evaluation in patients with Moebius syndrome. METHODS: Retrospective, cross-sectional study that included patients with Moebius syndrome over 9 years of age who had lateral cephalometric radiographs. Cephalometric analysis measurements of Ricketts, Steiner, and McNamara were performed. Quantitative data are expressed as mean and standard deviation, and qualitative data are expressed in totals and percentages. Comparative statistics between classic and incomplete Moebius and between patients older and younger than 16 years of age were performed. RESULTS: Twenty-four patients were included (54.2% females), mean age 17.46 ±â€Š8.85 years. Fifteen patients (62.5%) had classic Moebius syndrome, and nine (37.5%) had incomplete Moebius. Sixty-six percent of the patients presented either micrognathia or retrognathia, 95% showed mandibular hypoplasia, and 75% had a skeletal class II. Maxillary height was increased resulting in a vertical growth pattern. Upper and lower incisors tended towards proclination, and upper and lower lips protruded over cephalometric markings, and a long upper lip was evidenced in 41% of the patients. No significant differences were noted when comparing classic and incomplete Moebius syndrome. Patients younger than 16 years of age had significantly larger sella-nasion-A point and sella-nasion-B point angles, and a higher proportion of skeletal class II cases. CONCLUSIONS: Patients with Moebius syndrome have a vertical maxillary growth, micro or retrognathia, developing a skeletal class II and lip protrusion.

Aplicaciones de la impresión 3D en cirugía plástica reconstructiva / Use of 3D printing in reconstructive plastic surgery

Resumen La impresión 3D es una tecnología interesante en constante evolución. También conocida como manufactura aditiva, consiste en la conversión de diseños digitales a modelos físicos mediante la adición de capas sucesivas de material. En años recientes, y tras el vencimiento de múltiples patentes, diversos campos de las ciencias de la salud se han interesado en sus posibles usos, siendo la cirugía plástica una de las especialidades médicas que más ha aprovechado sus ventajas y aplicaciones, en especial la capacidad de crear dispositivos altamente personalizados a costos accesibles. Teniendo en cuenta lo anterior, el objetivo del presente artículo es describir los usos de la impresión 3D en cirugía plástica reconstructiva a partir de una revisión de la literatura. Las principales aplicaciones de la impresión 3D descritas en la literatura incluyen su capacidad para crear modelos anatómicos basados en estudios de imagen de pacientes, que a su vez permiten planificar procedimientos quirúrgicos, fabricar implantes y prótesis personalizadas, crear instrumental quirúrgico para usos específicos y usar biotintas en ingeniería tisular. La impresión 3D es una tecnología prometedora con el potencial de implementar cambios positivos en la práctica de la cirugía plástica reconstructiva en el corto y mediano plazo.

Abstract 3D printing is an interesting technology in constant evolution. Also known as additive manufacturing, it consists of the conversion of digital designs into physical models by successively adding material layer by layer. In recent years, and after the expiration of multiple patents, several fields of health sciences have approached this type of technology, plastic surgery being one of the medical specialties that has taken advantage of its benefits and applications, especially the ability to create highly customized devices at low costs. With this in mind, the objective of this work is to describe the uses of 3D printing in reconstructive plastic surgery based on a literature review. The main applications of 3D printing described in the literature include its ability to create anatomical models based on patient imaging studies, which in turn allow planning surgical procedures, manufacturing custom implants and prostheses, creating surgical or instrumental simulators, and using bioinks in tissue engineering. 3D printing is a promising technology with the potential to cause positive changes in the field of reconstructive plastic surgery in the short and medium term.

Carpometacarpal Joint Dislocations: Management and Long-Term Outcomes at a Specialized Hand Surgery Center in Latin America.

Carpometacarpal joint dislocations are uncommon hand injuries. These dislocations are usually misdiagnosed due to their non-specific clinical signs and tend to be difficult to identify in simple X-rays. We report our experience in the management of carpometacarpal bone dislocations at a specialized hand surgery center. Patients with carpometacarpal dislocations seen at the emergency department between 2013 and 2017 were included. All patients were treated with either closed reduction and percutaneous pinning (CRPP) or open reduction and internal fixation (ORIF). Postoperative functional assessment was performed at 6 and 18 months using the Disabilities of the Arm, Shoulder, and Hand (DASH) score. Eleven patients were included, 8 (72%) were managed with CRPP and the rest required ORIF (28%). For the functional outcome, we found an average DASH score of 27.9 at the 6 months threshold and of 1.5 at the 18 months threshold. Carpometacarpal dislocations are uncommon and easy to misdiagnose; the hand surgeon should have a high clinical suspicion in patients who sustained high-energy trauma, and imaging studies should be thoroughly evaluated. Closed reduction and percutaneous pinning is a safe and effective treatment option, with long-term good functional results.

Les dislocations des articulations carpométacarpiennes sont des blessures peu courantes de la main. Elles sont généralement mal diagnostiquées en raison de leurs signes cliniques non spécifiques et ont tendance à être difficiles à dépister au moyen d'une simple radiographie. Les auteurs rendent compte de leur expérience dans la prise en charge des dislocations des os carpométacarpiens dans un centre spécialisé de chirurgie de la main. Les patients atteints d'une dislocation carpométacarpienne vus à l'urgence entre 2013 et 2017 étaient inclus dans l'étude. Tous les patients ont subi une réduction fermée et un embrochage percutané (RFEP) ou une réduction ouverte et une fixation interne (ROFI). L'évaluation fonctionnelle postopératoire a eu lieu au bout de six et 18 mois au moyen du score d'incapacité du bras, de l'épaule et de la main (DASH). Onze patients ont participé : huit (72 %) ont subi une RFEP et les autres ont dû subir une ROFI (28 %). Le score DASH moyen du résultat fonctionnel s'établissait à 27,9 au seuil de six mois et à 1,5 à celui de 18 mois. Puisque les dislocations carpométacarpiennes sont rares et faciles à mal diagnostiquer, le chirurgien de la main devrait en présumer la possibilité chez les patients victimes d'un traumatisme de forte énergie, et les études d'imagerie devraient faire l'objet d'une évaluation approfondie. La RFEP est une possibilité de traitement sécuritaire et efficace qui donne de bons résultats fonctionnels à long terme.

Diagnosis and treatment of speech disorders in children with Moebius syndrome.

BACKGROUND: Moebius syndrome (MS) is characterized by congenital bilateral paralysis of the facial and abducens nerves. Clinical features include feeding problems, dysarthria, dysphagia, sialorrhea, strabismus, and lack of facial expression. Patients with MS frequently present with dysphagia during infancy. Further on during childhood a severe speech disorder is a common feature. However, articulation deficits in patients with MS are scarcely reported in the related scientific literature. OBJECTIVE: The aim of this study is to describe speech deviations, intelligibility and sialorrhea in patients with MS. MATERIAL AND METHODS: Eighty-seven patients with MS were prospectively studied. Age ranged from 4 to 18 years. A complete Speech and Language Pathology (SLP) evaluation was performed in all cases. The evaluation focused on articulation placement, sialorrhea and intelligibility of speech. RESULTS: Sialorrhea was detected in 23% of the patients. Abnormal articulation placement of bilabial phonemes was observed in 68% of the patients. Another 50% of the patients presented with articulation placement errors in other phonemes. Intelligibility was classified as adequate in 18% of the cases. Mildly affected intelligibility was found in 51% of the patients. Speech was considered moderately unintelligible in 20% of the cases. Unintelligible speech was found in 11% of the patients. CONCLUSIONS: From the results of this prospective study it can be concluded that a high percentage of patients with MS are at high risk of presenting with moderate to severe speech disorders. Thus, an early SLP intervention should be provided for this population in order to enhance speech development and reducing the risk of severe oral communication impairments.

Changes in Electrical Activity of the Masseter Muscle and Masticatory Force after the Use of the Masseter Nerve as Donor in Facial Reanimation Surgery.

Introduction The masseter nerve has been used as a donor nerve for facial reanimation procedures due to the multiple advantages it offers; it has been generally considered that sacrifice of the masseter nerve does not alter the masticatory apparatus; however, there are no objective studies to support this claim. Objective To evaluate the impact that the use of the masseter nerve in dynamic facial reconstruction has on the electrical activity of the masseter muscle and on bite force. Materials and Methods An observational and prospective longitudinal study was performed measuring bite force and electrical activity of the masseter muscles before and 3 months after dynamic facial reconstructive surgery using the masseter nerve. An occlusal analyzer and surface electromyography were employed for measurements. Results The study included 15 patients with unilateral facial paralysis, with a mean age of 24.06 ± 23.43. Seven patients were subjected to a masseter-buccal branch nerve transfer, whereas in eight patients, the masseter nerve was used as a donor nerve for gracilis free functional muscle transfer. Electrical activity of the masseter muscle was significantly reduced after surgery in both occlusal positions: from 140.86 ± 65.94 to 109.68 ± 68.04 ( p = 0.01) in maximum intercuspation and from 123.68 ± 75.64 to 82.64 ± 66.56 ( p = 0.01) in the rest position. However, bite force did not show any reduction, changing from 22.07 ± 15.66 to 15.56 ± 7.91 ( p = 0.1) after the procedure. Conclusion Masseter nerve transfer causes a reduction in electromyographic signals of the masseter muscle; however, bite force is preserved and comparable to preoperative status.

Surgical Planning for Mandibular Distraction Osteogenesis Using Low-Cost Three-Dimensional-Printed Anatomic Models.

Mandibular distraction osteogenesis (MDO) is a fairly common procedure in specialized craniofacial surgery centers. The MDO is a minimally invasive technique that is able to generate new bone in patients with a severe hypoplastic ascending ramus, while also expanding the overlying soft tissues; therefore, it has become the treatment of choice for the surgical correction of mandibular hypoplasias. One of the most common postoperative complications involves misplacement of the distractor and/or corticotomy, which can result in the creation of an erroneous distraction vector. The introduction of 3-dimensional (3D) printing has revolutionized preoperative planning in several surgical fields; however, cost can hinder its application in developing nations, specially in public institutions. The aim of this work is present our experience using low-cost 3D-printed anatomic models for preoperative planning and surgical simulation in patients requiring MDO.

Electromyographic evaluation of the facial and motor donor nerves before facial reanimation surgery in Moebius syndrome.

BACKGROUND: Moebius syndrome is a clinical entity characterized by bilateral facial and abducens nerve palsies; other cranial nerver might be affected as well. So far, no studies have reported the electromyographic responses of the facial musculature in this group of patients. OBJECTIVE: The objective of our study is to describe the electromyographic responses of the facial muscle and the main donor nerves for facial reanimation in patients with Moebius syndrome. METHOD: We analyzed electromyographies from the facial, hypoglossal, masseterine (trigeminal) and accessory nerves from patients with Moebius syndrome treated between 2010 and 2016. Results are presented as percentages and central tendency measures. RESULTS: 24 patients were included, mean age 11.79 ± 9.39 years. The facial nerve showed complete unilateral recruitment in 4 patients, partial bilaterally in 11, 7 showed no activity bilaterally and two had unilateral inactivity. The masseterine was normal in 14 patients, had partial recruitment bilaterally in 4 and unilaterally in 4 cases. The accessory nerve was normal in 20 patients, showed partial recruitment bilaterally in 3 and unilaterally in 1 patients. The hypoglossal was normal in 22 patients, and altered in 2 cases. CONCLUSION: Patients with Moebius syndrome show several degrees of alteration in electromyographic evaluation of the facial nerve. Electromyography is a useful tool in evaluating potential motor donor nerves for facial reanimation surgery.

ANTECEDENTES: El síndrome de Moebius es una entidad clínica caracterizada por parálisis bilateral congénita del nervio facial y el abducens. Adicionalmente se pueden encontrar afectados otros pares craneales. Actualmente no existen estudios que reporten la respuesta electromiográfica de la musculatura facial en esta población. OBJETIVO: Describir la respuesta electromiográfica de la musculatura facial y de los principales nervios donadores para reconstrucción facial dinámica en pacientes con síndrome de Moebius. MÉTODO: Se analizaron electromiografías de los nervios facial, hipogloso, maseterino (trigémino) y accesorio en pacientes con síndrome de Moebius atendidos entre 2010 y 2016. Los resultados se presentan en porcentajes y medidas de tendencia central y de dispersión. RESULTADOS: Se incluyeron 24 pacientes, con una edad promedio de 11.79 ± 9.39 años. El nervio facial presentó reclutamiento unilateral completo en 4 pacientes, parcial bilateral en 11 pacientes, en 7 pacientes ausencia de reclutamiento bilateral e inactividad unilateral en 2 pacientes. El maseterino tuvo reclutamiento completo en 14 pacientes, parcial bilateral en 4 pacientes y parcial unilateral en 4 pacientes. El nervio accesorio mostró reclutamiento completo en 20 pacientes, parcial bilateral en 3 pacientes y parcial unilateral en 1 paciente. El hipogloso mostró actividad normal en 22 pacientes, parcial bilateral en 1 paciente y parcial unilateral en 1 paciente. CONCLUSIÓN: Los pacientes con síndrome de Moebius presentan alteraciones en los registros electromiográficos del nervio facial. La electromiografía permite identificar los nervios donadores para realizar la reconstrucción dinámica.