Histological evaluation of capsules formed by texturized silicone implants with and without polyester mesh coverage (Parietex®). A study on female rats.

PURPOSE: To evaluate capsules formed by microtextured silicone implants with and without Parietex® mesh coverage histologically. METHODS: Sixty Wistar rats were divided in two groups (meshed and unmeshed). Each group was, then, divided into two subgroups for evaluation at 30 and 90 days. Capsules were analyzed based on hematoxylin and eosin (HE) and picrosirius staining. RESULTS: The number of fibroblasts, neutrophils and macrophages was similar among all subgroups. There was a higher lymphocyte reaction in the 30-day meshed group (p = 0.003). Giant cell reaction, granulation tissue and neoangiogenesis were similar among the subgroups. Synovial metaplasia was milder at 90-day in the unmeshed (p = 0.002) and meshed group (p < 0.001). Capsular thickness was significantly greater in the meshed samples (30-day p < 0.001 and 90-day p < 0.001). There was a similar amount of collagen types I and III in both groups. CONCLUSIONS: The mesh-covered implants produced capsules similar to the microtextured ones when analyzing inflammatory variables. Synovial metaplasia was milder at 90 than at 30 days, and the capsular thickness was significantly greater in the meshed group. A similar amount of collagen types I and III was observed. Due to these characteristics, the mesh coverage did not seem to significantly affect the local inflammatory activity.

Histological evaluation of capsules formed by texturized silicone implants with and without polyester mesh coverage (Parietex®). A study on female rats

ABSTRACT Purpose To evaluate capsules formed by microtextured silicone implants with and without Parietex® mesh coverage histologically. Methods Sixty Wistar rats were divided in two groups (meshed and unmeshed). Each group was, then, divided into two subgroups for evaluation at 30 and 90 days. Capsules were analyzed based on hematoxylin and eosin (HE) and picrosirius staining. Results The number of fibroblasts, neutrophils and macrophages was similar among all subgroups. There was a higher lymphocyte reaction in the 30-day meshed group (p = 0.003). Giant cell reaction, granulation tissue and neoangiogenesis were similar among the subgroups. Synovial metaplasia was milder at 90-day in the unmeshed (p = 0.002) and meshed group (p < 0.001). Capsular thickness was significantly greater in the meshed samples (30-day p < 0.001 and 90-day p < 0.001). There was a similar amount of collagen types I and III in both groups. Conclusions The mesh-covered implants produced capsules similar to the microtextured ones when analyzing inflammatory variables. Synovial metaplasia was milder at 90 than at 30 days, and the capsular thickness was significantly greater in the meshed group. A similar amount of collagen types I and III was observed. Due to these characteristics, the mesh coverage did not seem to significantly affect the local inflammatory activity.

Tratamento das ptoses mamárias com implantes submusculares e pontos de fixação do tecido mamário ao muscular: aspectos técnicos e avaliação de resultado / Treatment of breast ptosis with submuscular implants and points of attachment of the breast to the pectoralis muscle: technical considerations and outcome assessment

Introdução: Mastopexia associada à inclusão de implante é uma situação desafiadora para o cirurgião plástico. O objetivo é descrever a colocação de implante submuscular com descolamento anatômico mais pexia firme do tecido glandular usando pontos de fixação do tecido mamário ao muscular e analisar os resultados estéticos das pacientes operadas. Método: Foram realizadas 23 mastopexias com implantes no período entre abril de 2015 e julho de 2017, pelo mesmo cirurgião, sendo as mamas das pacientes marcadas previamente, na posição sentada. Realizou-se incisão no sulco mamário e descolamento até o polo superior da mama no plano subfascial, fixação da glândula ao músculo peitoral maior com 9 a 12 pontos. A seguir, iniciou-se a dissecção do músculo peitoral maior através de sua origem costal e transição com os músculos reto abdominal e serrátil, liberando amplamente na porção inferior. Introduziu-se o implante e completou-se a mastopexia. Os tamanhos dos implantes variaram de 255ml a 355ml. Fotos das mamas de 12 pacientes foram avaliadas por dois cirurgiões plásticos e dois leigos, nos seguintes parâmetros: resultado estético, simetria das aréolas e grau de ptose mamária. As avaliações podiam ser Ruim, Razoável ou Bom. Resultados: A técnica cirúrgica mostrou-se reprodutível, apenas 1 caso de hematoma unilateral, nenhuma infecção, queixas de dor discretas. Apenas um caso foi considerado, por um único avaliador, como Razoável; as demais avaliações consideradas como Bom. Conclusão: O tratamento de ptoses mamárias com colocação de implante submuscular acrescido de pexia da glândula ao músculo peitoral é uma técnica reprodutível e com bons resultados estéticos.

Introduction: Mastopexy associated with implant placement is challenging for plastic surgeons. The objective is to describe the placement of a submuscular implant with anatomical detachment in combination with stable fixation of the breast tissue to the pectoralis muscle and analyze the aesthetic results. Method: Twenty-three mastopexy procedures with implants were performed from April 2015 to July 2017 by the same surgeon, and surgical markings were made in the breasts of the patients in a seated position. An incision was made in the inframammary fold, and the breast tissue was elevated to the upper pole in the subfascial plane and attached to the pectoralis major muscle using 9-12 stitches. Subsequently, the inferior margin of the pectoralis major muscle and the transition from the rectus abdominis muscle to the serratus muscle were dissected to expose the muscle. The implant was introduced and mastopexy was completed. Implant size ranged from 255 mL to 355 mL. Photographs of the breasts of 12 patients were evaluated by two plastic surgeons and two non-medical subjects, who considered the aesthetic results, symmetry of the nipple-areola complex, and degree of breast ptosis. The results were scored as unsatisfactory, satisfactory, or good. Results: The surgical technique was reproducible; there was only one case of unilateral hematoma, no implant infections, and only complaints of mild pain. Only one case was scored as satisfactory by one evaluator, whereas the results of the other cases were considered good. Conclusion: The treatment of breast ptosis with the placement of a submuscular implant in combination with fixation of the breast to the pectoralis major muscle is reproducible and yields good aesthetic results.

Ossificação do pedículo vascular de um retalho livre de fíbula: relato de caso / Ossification of vascular pedicle in fibula free flap: a case report

Introdução: Várias são as vantagens da utilização de retalhos fibulares para as reconstruções de defeitos craniomaxilofaciais, incluindo a baixa morbidade da área doadora, boa qualidade óssea possibilitando a realização de implantes osteointegrados quando indicados, além da possibilidade de inclusão de uma ilha de pele quando indicado. Durante a dissecção do retalho, próximo à região do pedículo vascular, normalmente inclui-se um cuff muscular e uma faixa de periósteo. O potencial osteogênico do periósteo transplantado tem sido objeto de estudo. Relato de caso: paciente de 15 anos, submetido à reconstrução microcirúrgica com um retalho fibular para um defeito mandibular pós-ressecção de um sarcoma ósseo. Evoluiu com aumento de volume, de consistência óssea na região cervical próximo à cervicotomia realizada para anastomose vascular. Exames de imagem mostravam características ósseas da massa. Foi então submetido à nova cervicotomia e exploração da massa, sendo observada uma formação de tecido ósseo no local da anastomose vascular. Exame anatomopatológico da peça mostrava formação de tecido ósseo adjacente ao retalho periostal. Discussão: Durante a dissecção do retalho fibular, a osteotomia é realizada a alguns centímetros da articulação do joelho, isto a fim de facilitar a dissecção do pedículo vascular na região do oco poplíteo. O pedículo vascular fica então envolto por uma cuff muscular e por uma tira de periósteo. Este mantém sua capacidade osteogênica, que pode ser ativada de acordo com o estímulo do local. A ossificação do periósteo do pedículo vascular de retalhos livres de fíbula permanece um evento raro, porém relatado por centros diferentes.

Introduction: The use of fibula flaps for the reconstruction of craniomaxillofacial defects has many advantages, including the low morbidity of the donor area, good bone quality for use of osseointegrated implants, and the possibility to include a skin island, when indicated. During the dissection of the flap, a muscle "cuff" and a periosteal strip are usually included near the region of the vascular pedicle. The osteogenic potential of the transplanted periosteum has been the object of studies. Case report: A 15-year-old male patient underwent microsurgical reconstruction using a fibula flap for a mandibular defect caused by the resection of a bone sarcoma. He developed increased volume and bone consistency in the cervical region next to the area where a cervicotomy was performed for vascular anastomosis. Imaging examinations showed the characteristics of the bone mass. He then underwent a new cervicotomy and mass exploratory surgery because bone tissue formation was observed at the site of vascular anastomosis. Anatomopathological examination of the specimen showed bone tissue formation next to the periosteal flap. Discussion: During fibula flap dissection, osteotomy is performed a few centimeters from the knee joint to facilitate the dissection of the vascular pedicle in the region of the popliteal fossa. Then, the vascular pedicle is surrounded by a muscle cuff and periosteal strip. This maintains its osteogenic capacity, which can be activated according to the stimulus of the area. Although periosteal ossification of the vascular pedicle in fibula free flaps is a rare event, it has been reported in different centers.

A versatilidade do retalho anterolateral da coxa em reconstruções oncológicas: série de casos do serviço de cirurgia plástica reconstrutora e microcirurgia do hospital Erasto Gaertner / Versatility of the anterolateral thigh flap in oncology reconstructions: case reports of the reconstructive plastic surgery and microsurgery procedures in Erasto Gaertner Hospital

Introdução: Retalho anterolateral da coxa (ALT) foi descrito em 1984, baseado nos vasos perfurantes da artéria circunflexa femoral lateral. Trata-se de um retalho cutâneo, localizado no terço médio da coxa anterior, e lateral aos músculos reto femoral e vasto lateral. A baixa morbidade, relacionada à área doadora, e a possibilidade de utiliza-lo com diversas dimensões o tornam um retalho muito versátil. Objetivo: Apresentar sua versatilidade no serviço de Cirurgia Plástica Reconstrutora e Microcirurgia, do Hospital Erasto Gaertner, através do relato de três casos. Casos: Foram descritos dois casos com utilização do retalho ALT para reconstrução de cabeça e pescoço, e um caso com reconstrução do hemitórax direito.

Introduction: The anterolateral thigh (ALT) flap first described in 1984 is based on perforator vessels of the lateral femoral circumflex artery. It is a cutaneous flap located in the middle third of the anterior thigh and lateral to the rectus femoris and vastus lateralis. The low morbidity related to the donor site and its usefulness for different dimensions make it a versatile flap. Objective: This study aimed to present the versatility of the ALT flap in plastic and reconstructive surgeries at the Erasto Gaertner Hospital through a report of three cases. Cases: We describe three cases in which the ALT flap was used for the head and neck, and right hemithorax reconstructions.

An alternative experimental model for training in microsurgery / Modelo experimental alternativo para treinamento em microcirurgia

OBJECTIVE: to describe a new model of training in microsurgery with pig spleen after splenectomy performed by undergraduate students of the Discipline of Operative Technique of the UFPR Medical School. METHODS: after the completion of splenectomy we performed dissection of the vascular pedicle, distal and proximal to the ligation performed for removal of the spleen. After complete dissection of the splenic artery and vein with microscope, clamps were placed and the vessels were cut. We then made the anastomosis of the vessels with 9.0 nylon. RESULT: the microsurgical training with a well-defined routine, qualified supervision and using low cost experimental materials proved to be effective in the practice of initial microvascular surgery. CONCLUSION: the use of pig spleen, which would be discarded after splenectomy, is an excellent model for microsurgical training, since besides having the consistency and sensitivity of a real model, it saves the sacrifice of a new animal model in the initial learning phase of this technique. .

OBJETIVO: descrever um novo modelo de treinamento em microcirurgia com baço de suínos após esplenectomia realizada pelos alunos de graduação da disciplina de técnica operatória do curso de medicina da UFPR. MÉTODOS: após a realização da esplenectomia realizamos dissecção do pedículo vascular distal e proximal a ligadura realizada para a retirada do baço. Após a dissecção completa da artéria e veia esplênica ,com microscópio, são colocados os clampes e o vaso é seccionado. É então realizada a anastomose dos vasos com mononylon 9,0. RESULTADO: o treinamento microcirúrgico, com uma rotina bem definida, supervisão qualificada e utilizando materiais experimentais de baixo custo, mostrou-se efetivo na prática de cirurgia microvascular inicial. CONCLUSÃO: a utilização do baço suíno, que seria desprezado após esplenectomia, é um excelente modelo para treinamento microcirúrgico, pois além de ter a consistência e delicadeza de um modelo real poupa o sacrifício de um novo modelo animal, na fase inicial de aprendizado desta técnica. .