Intradural anatomy and mobilization techniques of oculomotor, trochlear and abducens nerve after microsurgical dissection: a cadaveric study.

BACKGROUND: This study investigates the mobilization of cranial nerves in the upper clival region to improve surgical approaches. Cadaveric specimens (n = 20) were dissected to examine the oculomotor, trochlear, and abducens nerves. Dissection techniques focused on the nerves' intradural course and their relationship to surrounding structures. METHODS: Pre-dissection revealed the nerves' entry points into the clival dura and their proximity to each other. Measurements were taken to quantify these distances. Following intradural dissection, measurements were again obtained to assess the degree of nerve mobilization. RESULTS: Dissection showed that the abducens nerve takes three folds during its course: at the dural foramen, towards the posterior cavernous sinus, and lastly within the cavernous sinus. The trochlear nerve enters the dura and makes two bends before entering the cavernous sinus. The oculomotor nerve enters the cavernous sinus directly and runs parallel to the trochlear nerve. Importantly, intradural dissection increased the space between the abducens nerves (by 4.21 mm) and between the oculomotor and trochlear nerves (by 3.09 mm on average). This indicates that nerve mobilization can create wider surgical corridors for approaching lesions in the upper clivus region. CONCLUSIONS: This study provides a detailed anatomical analysis of the oculomotor, trochlear, and abducens nerves in the upper clivus. The cadaveric dissections and measurements demonstrate the feasibility of mobilizing these nerves to achieve wider surgical corridors. This information can be valuable for surgeons planning endoscopic or microscopic approaches to lesions in the upper clivus region.

Protocol of a clinical trial on the effectiveness of pudendal nerve block with and without neurostimulation in reducing posthemorroidectomy pain.

INTRODUCTION: Hemorrhoidal pathology is the most frequent proctological problem with a prevalence of 44% of the adult population. The most effective treatment is surgery but it also has the highest postoperative pain rate with moderate to severe pain rates of 30-40% during the first 24-48 hours. Here lies the importance of seeking measures to improve this situation, such as the pudendal nerve block with local anesthetic. However, the variability of the pudendal nerve sometimes makes its blockade ineffective and for this reason nerve location methods are sought to achieve a higher rate of success. The main aim of the study is to compare pain in the immediate postoperative period (24 h) after hemorrhoidectomy in patients with pudendal nerve block guided by anatomical references and guided by neurostimulation. METHODS: The present project proposes the performance of a single-center, triple-blind, randomized clinical trial of efficacy, carried out under conditions of routine clinical practice. Patients over 18 years old with hemorrhoids refractory to medical treatment, symptomatic grade III-IV and grade II hemorrhoids that do not respond to conservative procedures in a third level hospital in Spain and that are subsidiaries of surgery in major ambulatory surgery will be included. Demographic variables, variables on hemorrhoidal pathology, details of surgery, verbal numeric pain scale in the preoperative period and surgical complications will be collected. RESULTS: Not avaliable until the end of the study. CONCLUSIONS: The pudendal nerve block guided by anatomical landmarks has been shown to be useful in postoperative pain control after hemorrhoidectomy although the use of the neurostimulator has not been well studied and we believe it may improve outcom.

[Superficial peroneal nerve entrapment: ultrasound-guided hydrodissection. A case report]. / Atrapamiento de nervio peroneo superficial: hidrodisección ecoguiada. A propósito de un caso.

Peripheral nerve entrapment is an underdiagnosed pathology when it is not the most common syndromes such as carpal tunnel syndrome or cubital tunnel syndrome. The symptomatic lesion of the superficial peroneal nerve (SPN) has a low incidence, being its diagnosis sometimes complex. It is based on a exhaustive physical examination and imaging tests such as ultrasound (US) or magnetic resonance imaging (RMI). Conservative treatment may sometimes not be sufficient, requiring surgical techniques in refractory cases. We present a patient diagnosed with superficial peroneal nerve entrapment by ultrasound and diagnostic nerve block that was subsequently resolved by hydrodissection technique at the level of the deep crural fascia tunnel. The results were satisfactory with a complete resolution of the clinical process since the application of this technique.

Lesión electromiográfica del nervio axilar en fracturas del extremo proximal del húmero. Estudio prospectivo, observacional, analizando el patrón de fractura / Electromyographic axillary nerve injury in fractures of the proximal humerus: Prospective, observational study, analysing the fracture pattern

Objetivo: Descripción y análisis de la relación entre las fracturas de húmero proximal y la lesión traumática del nervio axilar circunflejo. Material y método: Estudio prospectivo, observacional, de una serie de casos consecutivos de fracturas de extremo proximal de húmero. Se realizó valoración radiográfica, clasificando las fracturas según el sistema AO (Arbeitsgemeinshaft für Osteosynsthesefragen, Asociación de Grupo de Trabajo para el Estudio de la Fijación Interna de las Fracturas), y electromiografía (EMG) para la evaluación de la lesión del nervio axilar. Resultados: De 105 casos consecutivos de fracturas de húmero proximal, 31 pacientes cumplían los criterios de inclusión. Muestra: 86% mujeres y 14% hombres con edad media de 71,8 años (30-96 años). De los pacientes incluidos en el estudio, 58% presentó una EMG normal o leve axonotmesis, 23% presentó neuropatía del nervio axilar sin denervación muscular y 19%, lesión con denervación del nervio axilar. Los pacientes que sufrieron fracturas complejas de húmero proximal (AO11B y AO11C) tuvieron más riesgo de presentar lesiones tipo neuropatía axilar con denervación muscular en la EMG, siendo esta relación estadísticamente significativa (p < 0,001). Conclusiones: Los pacientes que sufren fracturas complejas de húmero proximal (AO11B y AO11C) tienen más riesgo de presentar lesiones tipo neuropatía axilar con denervación muscular en la EMG (p < 0,001).(AU)

Objective: Description and analysis of the relation between the proximal humerus fracture patterns and the traumatic injury of the axillary nerve. Material and method: Prospective, observational study of a consecutive case series that analyzed proximal humerus fractures. Radiographic evaluation was performed, and AO (Arbeitsgemeinshaft für Osteosynsthesefragen) system was used to classify the fractures. Electromyography was used to diagnose the axillary nerve injury. Results: Thirty-one patients on 105 who had a proximal humerus fracture met inclusion criteria. Eighty-six percent of the patients included were women and 14% men. The mean age was 71.8 years (30–96 years). Of the patients included in the study, 58% had normal or mild axonotmesis EMG, 23% had axillary nerve neuropathy without muscle denervation and 19% had injury with axillary nerve denervation. Patients who suffered complex fractures of the proximal humerus (AO11B and AO11C) had a higher risk of presenting axillary neuropathy type lesions with muscle denervation in the EMG, this relationship being statistically significant (p<0.001). Conclusion: Patients who have more risk on presenting axillary nerve neuropathy with muscle denervation in electromyography are those who present complex proximal humerus fractures AO11B and AO11C (p<0.001).(AU)

[Translated article] Electromyographic axillary nerve injury in fractures of the proximal humerus: Prospective, observational study, analysing the fracture pattern / Lesión electromiográfica del nervio axilar en fracturas del extremo proximal del húmero. Estudio prospectivo, observacional, analizando el patrón de fractura

Objetivo: Descripción y análisis de la relación entre las fracturas de húmero proximal y la lesión traumática del nervio axilar circunflejo. Material y método: Estudio prospectivo, observacional, de una serie de casos consecutivos de fracturas de extremo proximal de húmero. Se realizó valoración radiográfica, clasificando las fracturas según el sistema AO (Arbeitsgemeinshaft für Osteosynsthesefragen, Asociación de Grupo de Trabajo para el Estudio de la Fijación Interna de las Fracturas), y electromiografía (EMG) para la evaluación de la lesión del nervio axilar. Resultados: De 105 casos consecutivos de fracturas de húmero proximal, 31 pacientes cumplían los criterios de inclusión. Muestra: 86% mujeres y 14% hombres con edad media de 71,8 años (30-96 años). De los pacientes incluidos en el estudio, 58% presentó una EMG normal o leve axonotmesis, 23% presentó neuropatía del nervio axilar sin denervación muscular y 19%, lesión con denervación del nervio axilar. Los pacientes que sufrieron fracturas complejas de húmero proximal (AO11B y AO11C) tuvieron más riesgo de presentar lesiones tipo neuropatía axilar con denervación muscular en la EMG, siendo esta relación estadísticamente significativa (p < 0,001). Conclusiones: Los pacientes que sufren fracturas complejas de húmero proximal (AO11B y AO11C) tienen más riesgo de presentar lesiones tipo neuropatía axilar con denervación muscular en la EMG (p < 0,001).(AU)

Objective: Description and analysis of the relation between the proximal humerus fracture patterns and the traumatic injury of the axillary nerve. Material and method: Prospective, observational study of a consecutive case series that analyzed proximal humerus fractures. Radiographic evaluation was performed, and AO (Arbeitsgemeinshaft für Osteosynsthesefragen) system was used to classify the fractures. Electromyography was used to diagnose the axillary nerve injury. Results: Thirty-one patients on 105 who had a proximal humerus fracture met inclusion criteria. Eighty-six percent of the patients included were women and 14% men. The mean age was 71.8 years (30–96 years). Of the patients included in the study, 58% had normal or mild axonotmesis EMG, 23% had axillary nerve neuropathy without muscle denervation and 19% had injury with axillary nerve denervation. Patients who suffered complex fractures of the proximal humerus (AO11B and AO11C) had a higher risk of presenting axillary neuropathy type lesions with muscle denervation in the EMG, this relationship being statistically significant (p<0.001). Conclusion: Patients who have more risk on presenting axillary nerve neuropathy with muscle denervation in electromyography are those who present complex proximal humerus fractures AO11B and AO11C (p<0.001).(AU)

Desplazamiento de los catéteres para bloqueo continuo del nervio supraescapular tras fisioterapia: estudio en cadáveres / Dislodgment of continuous suprascapular nerve block catheters after physiotherapy: A cadaver study

Antecedentes: Los bloqueos continuos de los nervios periféricos son de uso común para el manejo del dolor. Sin embargo, la incidencia de desplazamiento o migración del catéter es dudosa, pudiendo ser infraestimada y no denunciarse. Nuestro objetivo fue evaluar el posicionamiento del extremo del catéter supraescapular antes y después de la manipulación rutinaria y simulada mediante fisioterapia de hombro en un modelo cadavérico anatómico.MétodoSe colocaron 8 catéteres para bloqueo continuo y ecoguiado del nervio supraescapular en cadáveres frescos criopreservados. La tomografía computarizada (TC) confirmó la localización de la punta del catéter tras la inyección de 1ml de medio de contraste. Realizamos una serie de movimientos estandarizados de hombro durante una sesión simulada de fisioterapia de hombro en cadáveres. Tras ello, administramos 1ml de azul de metileno a través de los catéteres, y seguidamente realizamos disecciones para identificar con precisión la localización de las puntas del catéter y compararlas con su localización previa a la «fisioterapia».ResultadosLa imagen de la TC confirmó la localización en todos los casos de los extremos del catéter en la muesca supraescapular. Sin embargo, tras la fisioterapia, se encontró que 2 catéteres (25%) habían migrado y, en especial, uno fue localizado en el músculo supraespinoso y el otro en el músculo trapecio.ConclusiónNuestros hallazgos sugieren que el desplazamiento del catéter puede producirse en cerca del 25% de los casos tras la manipulación mediante fisioterapia simulada. Sin embargo, es necesaria más investigación para determinar la incidencia real de los desplazamientos del catéter en la práctica clínica. (AU)

Background: Continuous peripheral nerve blocks are commonly used for pain management. However, the incidence of catheter dislodgement or migration is unclear, and may be underestimated and underreported. Our objective was to assess suprascapular catheter tip positioning before and after routine simulated shoulder physiotherapy manipulation in an anatomical cadaver model.MethodEight ultrasound-guided continuous suprascapular nerve block catheters were placed in cryopreserved fresh cadavers. Computed tomography (CT) confirmed the location of the catheter tip after injection of 1ml of contrast medium. We performed a series of standardized shoulder movements during a simulated shoulder physiotherapy session in cadavers. Following this, we administered 1ml of methylene blue through the catheters, and then performed anatomical dissections to accurately identify the location of the catheter tips and compare them to their placement prior to the ‘physiotherapy’ResultCT imaging confirmed the location of the catheter tips at the suprascapular notch in all cases. However, following physiotherapy, 2 catheters (25%) were found to have migrated - specifically, 1 was located in the supraspinatus muscle, and the other was located in the trapezius muscle.ConclusionOur findings suggest that catheter dislodgement may occur in approximately 25% of cases following simulated physiotherapy manipulation. However, further research is needed to determine the read incidence of catheter dislodgement in clinical practice. (AU)

Dislodgment of continuous suprascapular nerve block catheters after physiotherapy: A cadaver study.

BACKGROUND: Continuous peripheral nerve blocks are commonly used for pain management. However, the incidence of catheter dislodgement or migration is unclear, and may be underestimated and underreported. Our objective was to assess suprascapular catheter tip positioning before and after routine simulated shoulder physiotherapy manipulation in an anatomical cadaver model. METHOD: Eight ultrasound-guided continuous suprascapular nerve block catheters were placed in cryopreserved fresh cadavers. Computed tomography (CT) confirmed the location of the catheter tip after injection of 1 ml of contrast medium. We performed a series of standardized shoulder movements during a simulated shoulder physiotherapy session in cadavers. Following this, we administered 1 ml of methylene blue through the catheters, and then performed anatomical dissections to accurately identify the location of the catheter tips and compare them to their placement prior to the 'physiotherapy'. RESULT: CT imaging confirmed the location of the catheter tips at the suprascapular notch in all cases. However, following physiotherapy, 2 catheters (25%) were found to have migrated - specifically, 1 was located in the supraspinatus muscle, and the other was located in the trapezius muscle. CONCLUSION: Our findings suggest that catheter dislodgement may occur in approximately 25% of cases following simulated physiotherapy manipulation. However, further research is needed to determine the read incidence of catheter dislodgement in clinical practice.

Manejo de Alteraciones Neurosensoriales Asociadas a Procedimientos Quirúrgicos Mandibulares, Scoping Review

Las alteraciones neurosensoriales son complicaciones que se pueden presentar posterior a la realización de ciertos procedimientos quirúrgicos orales. Múltiples reportes indican específicamente el territorio inervado por el nervio alveolar inferior y nervio lingual como las regiones mayormente afectadas. Dar a conocer las diferentes alternativas terapéuticas para estas complicaciones, sería de suma relevancia para el clínico, con el propósito de mejorar el pronóstico en cuanto a la recuperación neurosensorial de estos nervios. El objetivo de este trabajo fue describir el manejo terapéutico de las alteraciones neurosensoriales asociadas al daño del nervio alveolar inferior y nervio lingual, en procedimientos quirúrgicos mandibulares. La búsqueda de la literatura científica fue realizada en las bases de datos PubMed, Scopus y Web of Science. Se utilizaron los términos de búsqueda "Trigeminal nerve injuries", "lingual nerve", "mandibular nerve", "oral surgical procedures", "treatment" en conjunto al conector booleano "AND" y "OR". Fueron considerados artículos publicados entre los años 2012 y 2022. En la selección de los artículos primarios se eliminaron los duplicados y se aplicaron los criterios de inclusión y exclusión. Finalmente se realizó el análisis a texto completo con un total de 14 artículos seleccionados. Un total de 14 artículos fueron revisados. Del total de artículos, 6 corresponden a terapia láser de bajo nivel, 2 a medicación y bloqueo del ganglio estrellado, 1 a bloqueo de ganglio estrellado e irradiación con luz xenón y 5 artículos corresponden a tratamiento mediante reparación microquirúrgica. La terapia láser de bajo nivel, el bloqueo del ganglio estrellado, la administración de vitamina B12/ATP y la reparación microquirúrgica son tratamientos efectivos para las alteraciones neurosensoriales ocasionadas por lesiones del nervio alveolar inferior y nervio lingual.

SUMMARY: Neurosensory abnormalities are complications can occur after performing certain oral surgical procedures. Multiple reports specifically indicate the area innervated by the inferior alveolar nerve and the lingual nerve as the most affected regions. Presenting the different therapeutic alternatives for these complications would be extremely relevant for the clinician, in order to improve the prognosis in terms of neurosensory recovery of these nerves. The objective of this study was to describe the therapeutic management of neurosensory abnormalities associated with damage to the inferior alveolar nerve and lingual nerve, in mandibular surgical procedures. The search for scientific literature was carried out in the PubMed, Scopus and Web of Science databases. The search terms "Trigeminal nerve injuries", "lingual nerve", "mandibular nerve", "oral surgical procedures", "treatment" together with the boolean connector "AND" and "OR" were used. Articles published between the years 2012 and 2022 were considered. In the selection of primary articles, duplicates were eliminated and the inclusion and exclusion criteria were applied. Finally, the full text analysis was carried out with a total of 14 selected articles. A total of 14 articles were reviewed. About the articles, 6 correspond to low-level laser therapy, 2 to medication and stellate ganglion block, 1 to stellate ganglion block and xenon light irradiation, and 5 articles correspond to treatment by microsurgical repair. Low-level laser therapy, stellate ganglion block, vitamin B12/ATP administration, and microsurgical repair are effective treatments for neurosensory abnormalities caused by inferior alveolar nerve and lingual nerve injuries.

Técnica de Latarjet para la inestabilidad anterior de hombro: implicaciones en la inervación del músculo subescapular / Latarjet procedure for shoulder instability: Implications in the innervation of the subscapularis muscle

Introducción: El objetivo de este estudio es analizar la relación existente entre la inervación del músculo subescapular y los pasos quirúrgicos de la técnica de Latarjet. Material y método: Se realizó un estudio anatómico mediante disección de 12 hombros fijados en formol, y se analizó el patrón de inervación del músculo subescapular. Se midió el tamaño del tendón en la interlínea articular, la distancia craneocaudal desde el borde superior al borde inferior del subescapular, en la entrada de los nervios, y la distancia mediolateral, desde los nervios hasta la interlínea articular. Se realizó la técnica de Latarjet y se midieron las distancias horizontales de los nervios subescapulares a la interlínea articular y de los nervios a la división del subescapular. Se describió la zona de seguridad por la que transcurre la división del subescapular sin dañar los nervios. Resultados: El músculo subescapular está inervado por 3 ramas del nervio subescapular: superior, medio e inferior, que siguen una distribución constante. No se encontraron diferencias estadísticamente significativas en las distancias de los nervios medidas antes y después de la técnica de Latarjet. Para evitar lesionar los nervios, es preciso realizar la división del subescapular entre los dos tercios superiores y el tercio inferior a lo largo del músculo. Conclusión: El músculo subescapular presenta una triple inervación constante. No hemos apreciado cambios estadísticamente significativos en la inervación tras la cirugía de Latarjet. Por tanto, la técnica de Latarjet parece respetar esta inervación al realizar la división del subescapular en su zona de seguridad.

Introduction: Our aim was to describe whether Latarjet's technique affects subscapularis muscle innervation. Materials and methods: We studied 12 embalmed shoulders. Subscapularis muscle innervation pattern was registered. Dimensions of the subscapularis at the glenohumeral joint line and the nerves entry point were measured. Horizontal distances from the nerves to the glenohumeral joint line as well as vertical ones to the split were measured before and after Latarjet procedure. A safe zone for the split was designed to avoid damage to subscapularis innervation. Results: Subscapularis muscle is innervated by three principal branches: upper, middle, and inferior subscapularis nerves. No statistical differences were found between innervation distances before and after Latarjet procedure. To perform subscapularis split along the muscle safe zone, two thirds’ proportions throughout all the split must be maintained. Conclusions: Subscapularis muscle has a triple innervation and was not altered after Latarjet procedure. Therefore, Latarjet technique seems to respect subscapularis muscle innervation if its split is placed through the subscapularis muscle safe zone.(AU)

[Translated article] Latarjet procedure for shoulder instability: Implications in the innervation of the subscapularis muscle / Técnica de Latarjet para la inestabilidad anterior de hombro: implicaciones en la inervación del músculo subescapular

Introducción: El objetivo de este estudio es analizar la relación existente entre la inervación del músculo subescapular y los pasos quirúrgicos de la técnica de Latarjet. Material y método: Se realizó un estudio anatómico mediante disección de 12 hombros fijados en formol, y se analizó el patrón de inervación del músculo subescapular. Se midió el tamaño del tendón en la interlínea articular, la distancia craneocaudal desde el borde superior al borde inferior del subescapular, en la entrada de los nervios, y la distancia mediolateral, desde los nervios hasta la interlínea articular. Se realizó la técnica de Latarjet y se midieron las distancias horizontales de los nervios subescapulares a la interlínea articular y de los nervios a la división del subescapular. Se describió la zona de seguridad por la que transcurre la división del subescapular sin dañar los nervios. Resultados: El músculo subescapular está inervado por 3 ramas del nervio subescapular: superior, medio e inferior, que siguen una distribución constante. No se encontraron diferencias estadísticamente significativas en las distancias de los nervios medidas antes y después de la técnica de Latarjet. Para evitar lesionar los nervios, es preciso realizar la división del subescapular entre los dos tercios superiores y el tercio inferior a lo largo del músculo. Conclusión: El músculo subescapular presenta una triple inervación constante. No hemos apreciado cambios estadísticamente significativos en la inervación tras la cirugía de Latarjet. Por tanto, la técnica de Latarjet parece respetar esta inervación al realizar la división del subescapular en su zona de seguridad.

Introduction: Our aim was to describe whether Latarjet's technique affects subscapularis muscle innervation. Materials and methods: We studied 12 embalmed shoulders. Subscapularis muscle innervation pattern was registered. Dimensions of the subscapularis at the glenohumeral joint line and the nerves entry point were measured. Horizontal distances from the nerves to the glenohumeral joint line as well as vertical ones to the split were measured before and after Latarjet procedure. A safe zone for the split was designed to avoid damage to subscapularis innervation. Results: Subscapularis muscle is innervated by three principal branches: upper, middle, and inferior subscapularis nerves. No statistical differences were found between innervation distances before and after Latarjet procedure. To perform subscapularis split along the muscle safe zone, two thirds’ proportions throughout all the split must be maintained. Conclusions: Subscapularis muscle has a triple innervation and was not altered after Latarjet procedure. Therefore, Latarjet technique seems to respect subscapularis muscle innervation if its split is placed through the subscapularis muscle safe zone.(AU)

Management of pudendal neuralgia with electrical stimulation. A systematic review.

INTRODUCTION AND OBJECTIVE: Pudendal neuralgia is a severely intense, painful, neuropathic condition, involving the dermatome of the pudendal nerve (S2, S3, S4). The diagnosis is complex and usually takes many years to be made. Techniques that use electrical current have been shown to decrease pain and improve quality of life in patients with this condition. The aim of this review was to analyze the existing literature on the effects of electrical current in the treatment of patients with pudendal neuralgia. MATERIAL AND METHODS: A literature search was carried out in PubMed, Cinahl, Medline, Cochrane Library, ENFISPO, PEDro, Scopus and Web of Science databases, using the search terms "Electric Stimulation Therapy", "pudendal neuralgia" and "pudendal nerve entrapment". RESULTS: The most frequently repeated intervention is pulsed radiofrequency. Other techniques used are transcutaneous electrical nerve stimulation, pulsed electromagnetic field therapy and neuromodulation. All studies show significant improvement in pain, analgesic intake, depression-anxiety or quality of life. CONCLUSIONS: The application of electrical current seems to be effective in the management of pudendal neuralgia. The scientific evidence is scarce, of poor methodological quality, and its use is based on the efficacy demonstrated in other indications of chronic pain.

The Accessory Muscular Head of the Triceps Brachii Muscle with Tendinous Attachment / Cabeza Muscular Accesoria del Músculo Triceps Braquial con Inserción Tendinosa

SUMMARY: Variations in the triceps brachii muscle are uncommon, and especially limited reports exist on the accessory heads of tendinous origin that attach near the upper medial part of the humerus. During anatomical training at Nagasaki University School of Medicine, the accessory head of the triceps brachii muscle was observed on the right upper arm of a 72-year-old Japanese female. It arose tendinously from the medial side of the upper humerus, then formed a muscle belly and joined the distal side of the long head. This accessory head had independent nerve innervation, and the innervating nerve branched from a bundle of the radial nerve, which divided the nerve innervating the long head and the posterior brachial cutaneous nerve. The origin of the innervation of the accessory head was the basis for determining that this muscle head was an accessory muscle to the long head of the triceps brachii muscle. Embryologically, we discuss that part of the origin of the long head of the triceps brachii muscle was separated early in development by the axillary nerve and the posterior brachial circumflex artery, and it slipped into the surgical neck of the humerus and became fixed there. The accessory head crossed the radial nerve and deep brachial artery. When clinicians encounter compression of the radial nerve or profunda brachii artery, they should consider the presence of accessory muscles as a possible cause.

Las variaciones en el músculo tríceps braquial son poco comunes y existen informes especialmente limitados sobre las cabezas accesorias de origen tendinoso que se insertan cerca de la parte medial superior del húmero. Durante un entrenamiento anatómico en la Facultad de Medicina de la Universidad de Nagasaki, se observó la cabeza accesoria del músculo tríceps braquial en la parte superior del brazo derecho de una mujer japonesa de 72 años. Se originaba tendinosamente desde el lado medial de la parte superior del húmero, luego formaba un vientre muscular y se unía al lado distal de la cabeza larga. Esta cabeza accesoria tenía inervación nerviosa independiente, cuyo nervio se ramificaba a partir de un ramo del nervio radial, que dividía el nervio que inervaba la cabeza larga y el nervio cutáneo braquial posterior. El origen de la inervación de la cabeza accesoria fue la base para determinar que esta cabeza muscular era un músculo accesorio de la cabeza larga del músculo tríceps braquial. Embriológicamente, discutimos que parte del origen de la cabeza larga del músculo tríceps braquial se separó temprananamente en el desarrollo por el nervio axilar y la arteria circunfleja braquial posterior, y se deslizó hacia el cuello quirúrgico del húmero y quedó fijado allí. La cabeza accesoria cruzaba el nervio radial y la arteria braquial profunda. Cuando los médicos encuentran compresión del nervio radial o de la arteria braquial profunda, deben considerar la presencia de mús- culos accesorios como una posible causa.

Effect of Long-term Peripheral Nerve Stimulation on Neuro-Muscular Complex Morphologic Recovery in Experiment / Efecto de la Estimulación del Nervio Periférico a Largo Plazo sobre la Recuperación Morfológica del Complejo Neuromuscular en Experimento

SUMMARY: Peripheral nerve injury is an extremely important medical and socio-economic problem. It is far from a solution, despite on rapid development of technologies. To study the effect of long-term electrical stimulation of peripheral nerves, we used a domestically produced electrical stimulation system, which is approved for clinical use. The study was performed on 28 rabbits. Control of regeneration was carried out after 3 month with morphologic techniques. The use of long-term electrostimulation technology leads to an improvement in the results of the recovery of the nerve trunk after an injury, both directly at the site of damage, when stimulation begins in the early period, and indirectly, after the nerve fibers reach the effector muscle.

La lesión de los nervios periféricos es un problema médico y socioeconómico extremadamente importante. Sin embargo, y a pesar del rápido desarrollo de las tecnologías, aún no tiene solución. Para estudiar el efecto de la estimulación eléctrica a largo plazo de los nervios periféricos, utilizamos un sistema de estimulación eléctrica de producción nacional, que está aprobado para uso clínico. El estudio se realizó en 28 conejos. El control de la regeneración se realizó a los 3 meses con técnicas morfológicas. El uso de tecnología de electro estimulación a largo plazo conduce a una mejora en los resultados de la recuperación del tronco nervioso después de una lesión, tanto directamente en el lugar del daño, cuando la estimulación comienza en el período temprano, como indirectamente, después de que las fibras nerviosas alcanzan el músculo efector.

Latarjet procedure for shoulder instability: Implications in the innervation of the subscapularis muscle. / Técnica de Latarjet para la inestabilidad anterior de hombro: implicaciones en la inervación del músculo subescapular.

INTRODUCTION: Our aim was to describe whether Latarjet's technique affects subscapularis muscle innervation. MATERIALS AND METHODS: We studied 12 embalmed shoulders. Subscapularis muscle innervation pattern was registered. Dimensions of the subscapularis at the glenohumeral joint line and the nerves entry point were measured. Horizontal distances from the nerves to the glenohumeral joint line as well as vertical ones to the split were measured before and after Latarjet procedure. A safe zone for the split was designed to avoid damage to subscapularis innervation. RESULTS: Subscapularis muscle is innervated by three principal branches: upper, middle, and inferior subscapularis nerves. No statistical differences were found between innervation distances before and after Latarjet procedure. To perform subscapularis split along the muscle safe zone, two thirds' proportions throughout all the split must be maintained. CONCLUSIONS: Subscapularis muscle has a triple innervation and was not altered after Latarjet procedure. Therefore, Latarjet technique seems to respect subscapularis muscle innervation if its split is placed through the subscapularis muscle safe zone.

Electromyographic axillary nerve injury in fractures of the proximal humerus: Prospective, observational study, analysing the fracture pattern. / Lesión electromiográfica del nervio axilar en fracturas del extremo proximal del húmero. Estudio prospectivo, observacional, analizando el patrón de fractura.

OBJECTIVE: Description and analysis of the relation between the proximal humerus fracture patterns and the traumatic injury of the axillary nerve. MATERIAL AND METHOD: Prospective, observational study of a consecutive case series that analyzed proximal humerus fractures. Radiographic evaluation was performed, and AO (Arbeitsgemeinshaft für Osteosynsthesefragen) system was used to classify the fractures. Electromyography was used to diagnose the axillary nerve injury. RESULTS: Thirty-one patients on 105 who had a proximal humerus fracture met inclusion criteria. Eighty-six percent of the patients included were women and 14% men. The mean age was 71.8 years (30-96 years). Of the patients included in the study, 58% had normal or mild axonotmesis EMG, 23% had axillary nerve neuropathy without muscle denervation and 19% had injury with axillary nerve denervation. Patients who suffered complex fractures of the proximal humerus (AO11B and AO11C) had a higher risk of presenting axillary neuropathy type lesions with muscle denervation in the EMG, this relationship being statistically significant (p<0.001). CONCLUSION: Patients who have more risk on presenting axillary nerve neuropathy with muscle denervation in electromyography are those who present complex proximal humerus fractures AO11B and AO11C (p<0.001).

[Translated article] Electromyographic axillary nerve injury in fractures of the proximal humerus: Prospective, observational study, analysing the fracture pattern.

OBJECTIVE: Description and analysis of the relation between the proximal humerus fracture patterns and the traumatic injury of the axillary nerve. MATERIAL AND METHOD: Prospective, observational study of a consecutive case series that analysed proximal humerus fractures. Radiographic evaluation was performed, and AO (Arbeitsgemeinshaft für Osteosynsthesefragen) system was used to classify the fractures. Electromyography was used to diagnose the axillary nerve injury. RESULTS: Thirty-one patients on 105 who had a proximal humerus fracture met inclusion criteria. Eighty-six percent of the patients included were women and 14% men. The mean age was 71.8 years (30-96 years). Of the patients included in the study, 58% had normal or mild axonotmesis EMG, 23% had axillary nerve neuropathy without muscle denervation and 19% had injury with axillary nerve denervation. Patients who suffered complex fractures of the proximal humerus (AO11B and AO11C) had a higher risk of presenting axillary neuropathy type lesions with muscle denervation in the EMG, this relationship being statistically significant (p<0.001). CONCLUSION: Patients who have more risk on presenting axillary nerve neuropathy with muscle denervation in electromyography are those who present complex proximal humerus fractures AO11B and AO11C (p<0.001).

[Translated article] Latarjet procedure for shoulder instability: Implications in the innervation of the subscapularis muscle.

INTRODUCTION: Our aim was to describe whether Latarjet's technique affects subscapularis muscle innervation. MATERIALS AND METHODS: We studied 12 embalmed shoulders. Subscapularis muscle innervation pattern was registered. Dimensions of the subscapularis at the glenohumeral joint line and the nerves entry point were measured. Horizontal distances from the nerves to the glenohumeral joint line as well as vertical ones to the split were measured before and after Latarjet procedure. A safe zone for the split was designed to avoid damage to subscapularis innervation. RESULTS: Subscapularis muscle is innervated by three principal branches: upper, middle, and inferior subscapularis nerves. No statistical differences were found between innervation distances before and after Latarjet procedure. To perform subscapularis split along the muscle safe zone, two thirds' proportions throughout all the split must be maintained. CONCLUSIONS: Subscapularis muscle has a triple innervation and was not altered after Latarjet procedure. Therefore, Latarjet technique seems to respect subscapularis muscle innervation if its split is placed through the subscapularis muscle safe zone.

Síndrome de Morning Glory / Morning Glory Syndrome

Introducción: la anomalía congénita del disco óptico conocida como "morning glory" (MG) es un desarrollo anómalo del nervio óptico, caracterizado por una cavidad amplia en forma de embudo del disco en el punto donde salen las fibras del nervio de la retina. Su presentación más frecuente es unilateral. La mayoría de los casos son aislados y no se asocian con anomalías sistémicas. Objetivo: se presenta el caso de un niño de 1 año con MG y los hallazgos imagenológicos. Caso clínico: presentamos el caso de un paciente masculino de 1 año con sospecha de patología visual; en el estudio se realizó resonancia magnética cerebral (RM) en la que se identificó excavación en forma de embudo de la papila del globo ocular izquierdo, alteración en la morfología del quiasma óptico con desplazamiento inferior asimétrico y engrosamiento del infundíbulo y del tallo hipofisiario. Discusión: el diagnóstico de MG es clínico, las imágenes aportan información adicional sobre anomalías oculares, craneofaciales y vasculares asociadas. En este caso además de la lesión ocular había anomalías de estructuras de línea media como el infundíbulo y el tallo hipofisiario, además de engrosamiento quiasmático. Conclusión: la valoración por imágenes en fundamental, no solo para describir la alteración del nervio óptico, si no para identificar y describir anomalías asociadas para realizar manejo integral del paciente.

Introduction: the congenital optic disc anomaly known as morning glory disc anomaly (MGDA) is an alteration of normal optic nerve development, characterized by an enlarged funnel-shaped cavity of the optic disc, the point in the eye where the optic nerve fibers leave the retina. The anomaly is typically unilateral. Most are isolated cases with no associated systemic anomalies. Objective: a case is presented in a one-year-old boy with MGDA and the corresponding imaging findings. Case reports: we present the case of a one-year-old male patient with suspected visual impairment. Cerebral magnetic resonance imaging (MRI) revealed a papillary funnel-shaped excavation in the left eye, alteration in the morphology and inferior asymmetric displacement of the optic chiasm and thickening of the pituitary infundibular stalk. Discussion: MGDA is diagnosed clinically, however, imaging provides additional information regarding the associated ocular, craniofacial and vascular abnormalities. In this case, in addition to the ocular lesion there were abnormalities of midline structures, such as, the pituitary infundibular stalk, as well as, optic chiasm thickening. Conclusion: imaging is fundamental, not only to describe the anatomic alteration of the optic nerve, but also to identify related abnormalities in order to provide patients a comprehensive management

Versatilidad anatómica del colgajo lateral del brazo. Estudio cadavérico en una muestra de población colombiana / Anatomical versatility of the lateral arm flap. Cadaver study in a sample of the Colombian population

Introducción y objetivo: El colgajo lateral del brazo es un recurso de cobertura para el cirujano de mano que tiene una amplia variedad de usos y aplicaciones por su versatilidad y facilidad de recolección con poca morbilidad del sitio donante. El objetivo de este estudio es documentar las principales variantes anatómicas y establecer puntos de referencias para el desarrollo y mejoramiento de las técnicas quirúrgicas actuales en una muestra de población colombiana. Material y métodos: Estudio descriptivo anatómico de 10 miembros superiores de cadáveres frescos congelados en los que realizamos disecciones para documentar las principales perforantes del colgajo lateral del brazo en población colombiana. Tomamos mediciones de distancia de las perforantes al epicóndilo lateral y sacamos proporciones según porcentajes del tamaño de la extremidad. Igualmente, cuantificamos número de perforantes en cada cuadrante y diámetro de los pedículos. Resultados: En el colgajo lateral del brazo, el orden de aparición de las perforantes de distal a proximal correspondió al 13, 19, 26 y 35% de la distancia del brazo (entre el epicóndilo y el acromion); en el segundo cuadrante encontramos la mayoría de las perforantes, la segunda y la cuarta, tuvieron menor variación con respecto a las demás perforantes, los pedículos proximales presentaron un mayor diámetro que los distales. Encontramos el nervio radial a la salida del tabique intermuscular en promedio a 14.08 cm (+/- 0.83) del epicóndilo, siendo esta referencia clave para una disección cuidadosa con el fin de evitar la lesión del mismo. Conclusiones: En nuestra población de estudio, el colgajo lateral del brazo posee una gran versatilidad, con un buen número de perforantes para su nutrición que le permite al cirujano múltiples opciones de cobertura...(AU)

Background and objective: The lateral arm flap is a coverage resource for the hand surgeon that has a wide variety of uses and applications due to its versatility and ease of collection with little morbidity from the donor site. The aim of this research is to carry out dissections of the lateral arm flap in cadavers of the Colombian population to describe the main anatomical vari-ants and establish reference points for the development and improvement of current surgical techniques. Methods: Anatomical descriptive study of 10 upper limbs from fresh-frozen cadavers in which dissections were performed to document the main perforators of the lateral flap of the arm in the Colombian population. Distance measurements were taken from the perforators to the lateral epicondyle and ratios were obtained according to percentages of limb size. Likewise, the number of perforators in each quadrant and the diameter of the pedicles were quantified. Results: The results showed that in the lateral arm flap the order of appearance of the perforators from distal to proximal corresponds to 13, 19, 26 and 35% of the distance of the arm (between the epicondyle and the acromion); most of the perforators were found in the second quadrant, the second and fourth have less variation compared to the other perforators, the proximal pedicles have a larger diameter than the distal ones, the radial nerve was found at the exit the intermuscular septum on average 14.08 cm (+/- 0.83) from the epicondyle, this is a key reference for a careful dissection in order to avoid injury to it. Conclusions: In our study population, the lateral arm flap is highly versatile with a good number of perforators for its nutrition, which allows the surgeon multiple coverage options. The bone perforators of the distal humerus must be protected in the most distal portion to avoid complications such as bone necrosis, especially in children...(AU)