ahmad hatem - Academia.edu (original) (raw)

Papers by ahmad hatem

Orientador: Prof. Dr. Luiz Antônio Munhoz da CunhaDissertação (mestrado) - Universidade Federal d... more Orientador: Prof. Dr. Luiz Antônio Munhoz da CunhaDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências da Saúde, Programa de Pós-Graduação em Clínica Cirúrgica. Defesa: Curitiba, 20/05/2016Inclui referências: f 41-43Área de concentraçãoResumo: Introdução: A parte distal do acetábulo (PDA) tem sido investigada como estabilizador do quadril em posições de flexão, com possíveis implicações na patogenia do impacto femoroacetabular e da instabilidade do quadril. Entretanto, é necessário um maior entendimento da morfologia normal e dos parâmetros para avaliar a PDA. Objetivos: Definir os parâmetros para avaliar a morfologia da PDA. Especificamente, os objetivos foram determinar: 1) a largura do corno anterior (CA) e corno posterior (CP) do acetábulo; 2) a inclinação da superfície articular do CA (ângulo gama) e CP (ângulo delta); 3) o ângulo de abertura anterior da PDA; (4) possíveis diferenças entre os gêneros masculino e feminino. Material e Métodos: Paquímetros di...

Proceedings of the 1st International Symposium Innovations in Life Sciences (ISILS 2019), 2019

Two cultivars of purple carrot 'Pupur' and 'Mayami shokoladnaya" were investigated. Anthocyanins ... more Two cultivars of purple carrot 'Pupur' and 'Mayami shokoladnaya" were investigated. Anthocyanins of both cultivars was qualitatively the samemain compound was cyanidin-3-feruloylhexosyl-pentosyl-hexodide, mole fraction of the anthocyanin was approximately 72 % of the overall anthocyanin content of carrot roots of cv. "Purpur" (I) and only 49 % in in carrot roots of cv. "Mayami shokoladnaya" (II). Cyanidin-3-pentosyl-hexoside (33.8 %) was found in carrot roots of (II) and only 4-18 % in carrot roots of (I). The overall accumulation of anthocyanins was fond in roots of carrots was 0.111 and 0.232 g per 100 g FW for cultivars I and II, respectively.

Cureus, 2020

Worldwide the chronic suppurative otitis media (CSOM) is one of the most common infectious diseas... more Worldwide the chronic suppurative otitis media (CSOM) is one of the most common infectious diseases in childhood and is a common cause of impaired hearing. The disease remains a challenging entity for the healthcare system of resource-limited nations despite the advances in modern medicine. The nature of hearing loss in CSOM is mainly conductive, the sensorineural hearing loss (SNHL) is also reported in such patients. The purpose of the study was to identify SNHL in patients with the mucosal type of CSOM and to find the impact of longterm discharging ears on bone conduction (BC) thresholds. Methods Patients with a diagnosis of the mucosal type of CSOM were identified from the record of ENT, Head and Neck Surgery clinic between January 2019 and January 2020. The patients were divided into three groups based on the duration of the disease: groups I, II, and III for 1-5 years, 5-10 years, and 10-15 years, respectively. Pure tone audiogram was reviewed, and data of BC was recorded for 500, 1000, and 2000 Hz. The descriptive frequency was calculated for SNHL in each group and group I was compared with other groups using a chi-square test. The mean BC threshold of group I was compared with other groups using a t-test. SPSS version 26 (IBM Corp., Armonk, New York) was used for statistical analysis.

Cureus, 2020

Open Access Original Article

Revista Brasileira de Ortopedia (English Edition), 2015

Objectives: To evaluate the results obtained through using an intramedullary or extramedullary gu... more Objectives: To evaluate the results obtained through using an intramedullary or extramedullary guide for sectioning the tibia in total knee arthroplasty procedures, with a view to identifying the accuracy of these guides and whether one might be superior to the other. Methods: This was a randomized double-blind prospective study on 41 total knee arthroplasty procedures performed between August 2011 and March 2012. The angle between the base of the tibial component and the mechanical axis of the tibia was measured during the immediate postoperative period by means of radiography in anteroposterior view on the tibia that encompassed the knee and ankle. Results: There was no demographic difference between the two groups evaluated. The mean alignment of the tibial component in the patients of group A (intramedullary) was 90.3 • (range: 84-97 •). In group B (extramedullary), it was 88.5 • (range: 83-94 •). Conclusion: In our study, we did not find any difference regarding the precision or accuracy of either of the guides. Some patients present an absolute or relative contraindication against using one or other of the guides. However, for the other cases, neither of the guides was superior to the other one.

Revista Brasileira de Ortopedia, 2015

Objetivos: Avaliar os resultados obtidos com o uso de guia intramedular ou extramedular para o co... more Objetivos: Avaliar os resultados obtidos com o uso de guia intramedular ou extramedular para o corte tibial em artroplastias totais do joelho, com vistas a identificar sua acurácia e a superioridade de um em relação ao outro. Métodos: Estudo prospectivo, randomizado, duplo cego de 41 artroplastias totais de joelho feitas entre agosto de 2011 e março de 2012. Foi medido o ângulo entre a base do componente tibial e o eixo mecânico da tíbia no período pós-operatório imediato por meio de radiografia em incidência anteroposterior da tíbia que englobou joelho e tornozelo. Resultados: Não houve diferença demográfica entre os dois grupos avaliados. O alinhamento médio do componente tibial nos pacientes do grupo A (intramedular) foi de 90,3 • (84 •-97 •). No grupo B (extramedular), foi de 88,5 • (83 •-94 •). Conclusão: Não encontramos, em nosso estudo, diferença quanto à precisão ou acurácia de qualquer um dos guias. Alguns pacientes apresentam contraindicação, absoluta ou relativa, para o uso de um ou outro guia. Todavia, para os demais casos, não há superioridade de algum deles.

Arthroscopy: The Journal of Arthroscopic & Related Surgery, 2015

Hip Arthroscopy and Hip Joint Preservation Surgery, 2014

The deep gluteal space has increasingly received attention since the evolution in the knowledge o... more The deep gluteal space has increasingly received attention since the evolution in the knowledge of deep gluteal pain etiologies and their diagnoses. The endoscopic technique is being utilized to assess and treat deep gluteal space pathologies, improving the understanding of the sciatic nerve anatomy and biomechanics. This chapter presents a "10-step technique" for deep gluteal space endoscopic assessment and sciatic nerve decompression.

Arthroscopy: The Journal of Arthroscopic & Related Surgery, 2014

The purpose of this study was to evaluate the temperature at the sciatic nerve when using a monop... more The purpose of this study was to evaluate the temperature at the sciatic nerve when using a monopolar radiofrequency (RF) probe to control bleeding in deep gluteal space endoscopy, as well as assess the fluid temperature profile. Methods: Ten hips in 5 fresh-frozen human cadaveric specimens from the abdomen to the toes were used for this experiment. Temperatures were measured at the sciatic nerve after 2, 5, and 10 seconds of continuous RF probe activation over an adjacent vessel, a branch of the inferior gluteal artery. Fluid temperatures were then measured at different distances from the probe (3, 5, and 10 mm) after 2, 5, and 10 seconds of continuous probe activation. All tests were performed with irrigation fluid flow at 60 mm Hg allowing outflow. Results: After 2, 5, or 10 seconds of activation over the crossing branch of the inferior gluteal artery, the mean temperature increased by less than 1 C on the surface and in the perineurium of the sciatic nerve. Considering the fluid temperature profile in the deep gluteal space, the distance and duration of activation influenced temperature (P < .05). Continuous delivery of RF energy for 10 seconds caused fluid temperature increases of 1.2 C, 2 C, and 3.1 C on average at 10 mm, 5 mm, and 3 mm of distance, respectively. Conclusions: This study found the tested monopolar RF device to be safe during use in vessels around the sciatic nerve after 2, 5, and 10 seconds of continuous activation. The maximum fluid temperature (28 C) after 10 seconds of activation at 3 mm of distance is lower than the minimal reported temperature necessary to cause nerve changes (40 C to 45 C). Clinical Relevance: Monopolar RF seems to be safe to the neural structures when used at more than 3 mm of distance and with less than 10 seconds of continuous activation in deep gluteal space endoscopy with fluid inflow and outflow.

Revista Brasileira de Ortopedia (English Edition), 2014

Objective: To evaluate the results from proximal fixation of uncemented conical femoral component... more Objective: To evaluate the results from proximal fixation of uncemented conical femoral components in patients with a type C proximal femur and compare them with the results obtained from type A and B femurs. Methods: This was a retrospective study on 87 patients with 90 uncemented total hip arthroplasty procedures. Three patients (three hips) were excluded because their follow-up lasted for less than two years. The follow-up ranged from 2 to 4.3 years and the mean was 2.8 years. The Bicontact femoral implant model was used. The preoperative radiographs were evaluated, the femurs were classified as Dorr types A, B or C and the cortical indices were measured. The patients were evaluated clinically by means of the Harris Hip Score (HHS), before the surgery and at the last follow-up. The sequences of postoperative radiographs were compared regarding stability, complications and any signs of osseointegration of the femoral prosthesis. Results: Among the 87 hips with follow-up greater than two years, 32 femurs were type A (37%), 37 type B (42%) and 18 type C (21%). Before the operation, the mean HHS was 39.4 for types A and B and 38.8 for type C. At the last follow-up, the mean HHS was 89.8 for types A and B and 86 for type C. None of the 87 femoral components had been revised by the time of the last follow-up; all of them were considered stable. In 86 cases, the radiographs showed signs of osseointegration. Conclusion: There were no significant differences in the clinical results or in the fixation (and osseointegration) of conical uncemented femoral prostheses with proximal porosity, among femurs with different types of femoral morphology according to the Dorr classification. This conclusion may vary if another implant model were to be used.

FIB-4 Proceedings, 2014

cited By 0International audienc

Orientador: Prof. Dr. Luiz Antônio Munhoz da CunhaDissertação (mestrado) - Universidade Federal d... more Orientador: Prof. Dr. Luiz Antônio Munhoz da CunhaDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências da Saúde, Programa de Pós-Graduação em Clínica Cirúrgica. Defesa: Curitiba, 20/05/2016Inclui referências: f 41-43Área de concentraçãoResumo: Introdução: A parte distal do acetábulo (PDA) tem sido investigada como estabilizador do quadril em posições de flexão, com possíveis implicações na patogenia do impacto femoroacetabular e da instabilidade do quadril. Entretanto, é necessário um maior entendimento da morfologia normal e dos parâmetros para avaliar a PDA. Objetivos: Definir os parâmetros para avaliar a morfologia da PDA. Especificamente, os objetivos foram determinar: 1) a largura do corno anterior (CA) e corno posterior (CP) do acetábulo; 2) a inclinação da superfície articular do CA (ângulo gama) e CP (ângulo delta); 3) o ângulo de abertura anterior da PDA; (4) possíveis diferenças entre os gêneros masculino e feminino. Material e Métodos: Paquímetros di...

Proceedings of the 1st International Symposium Innovations in Life Sciences (ISILS 2019), 2019

Two cultivars of purple carrot 'Pupur' and 'Mayami shokoladnaya" were investigated. Anthocyanins ... more Two cultivars of purple carrot 'Pupur' and 'Mayami shokoladnaya" were investigated. Anthocyanins of both cultivars was qualitatively the samemain compound was cyanidin-3-feruloylhexosyl-pentosyl-hexodide, mole fraction of the anthocyanin was approximately 72 % of the overall anthocyanin content of carrot roots of cv. "Purpur" (I) and only 49 % in in carrot roots of cv. "Mayami shokoladnaya" (II). Cyanidin-3-pentosyl-hexoside (33.8 %) was found in carrot roots of (II) and only 4-18 % in carrot roots of (I). The overall accumulation of anthocyanins was fond in roots of carrots was 0.111 and 0.232 g per 100 g FW for cultivars I and II, respectively.

Cureus, 2020

Worldwide the chronic suppurative otitis media (CSOM) is one of the most common infectious diseas... more Worldwide the chronic suppurative otitis media (CSOM) is one of the most common infectious diseases in childhood and is a common cause of impaired hearing. The disease remains a challenging entity for the healthcare system of resource-limited nations despite the advances in modern medicine. The nature of hearing loss in CSOM is mainly conductive, the sensorineural hearing loss (SNHL) is also reported in such patients. The purpose of the study was to identify SNHL in patients with the mucosal type of CSOM and to find the impact of longterm discharging ears on bone conduction (BC) thresholds. Methods Patients with a diagnosis of the mucosal type of CSOM were identified from the record of ENT, Head and Neck Surgery clinic between January 2019 and January 2020. The patients were divided into three groups based on the duration of the disease: groups I, II, and III for 1-5 years, 5-10 years, and 10-15 years, respectively. Pure tone audiogram was reviewed, and data of BC was recorded for 500, 1000, and 2000 Hz. The descriptive frequency was calculated for SNHL in each group and group I was compared with other groups using a chi-square test. The mean BC threshold of group I was compared with other groups using a t-test. SPSS version 26 (IBM Corp., Armonk, New York) was used for statistical analysis.

Cureus, 2020

Open Access Original Article

Revista Brasileira de Ortopedia (English Edition), 2015

Objectives: To evaluate the results obtained through using an intramedullary or extramedullary gu... more Objectives: To evaluate the results obtained through using an intramedullary or extramedullary guide for sectioning the tibia in total knee arthroplasty procedures, with a view to identifying the accuracy of these guides and whether one might be superior to the other. Methods: This was a randomized double-blind prospective study on 41 total knee arthroplasty procedures performed between August 2011 and March 2012. The angle between the base of the tibial component and the mechanical axis of the tibia was measured during the immediate postoperative period by means of radiography in anteroposterior view on the tibia that encompassed the knee and ankle. Results: There was no demographic difference between the two groups evaluated. The mean alignment of the tibial component in the patients of group A (intramedullary) was 90.3 • (range: 84-97 •). In group B (extramedullary), it was 88.5 • (range: 83-94 •). Conclusion: In our study, we did not find any difference regarding the precision or accuracy of either of the guides. Some patients present an absolute or relative contraindication against using one or other of the guides. However, for the other cases, neither of the guides was superior to the other one.

Revista Brasileira de Ortopedia, 2015

Objetivos: Avaliar os resultados obtidos com o uso de guia intramedular ou extramedular para o co... more Objetivos: Avaliar os resultados obtidos com o uso de guia intramedular ou extramedular para o corte tibial em artroplastias totais do joelho, com vistas a identificar sua acurácia e a superioridade de um em relação ao outro. Métodos: Estudo prospectivo, randomizado, duplo cego de 41 artroplastias totais de joelho feitas entre agosto de 2011 e março de 2012. Foi medido o ângulo entre a base do componente tibial e o eixo mecânico da tíbia no período pós-operatório imediato por meio de radiografia em incidência anteroposterior da tíbia que englobou joelho e tornozelo. Resultados: Não houve diferença demográfica entre os dois grupos avaliados. O alinhamento médio do componente tibial nos pacientes do grupo A (intramedular) foi de 90,3 • (84 •-97 •). No grupo B (extramedular), foi de 88,5 • (83 •-94 •). Conclusão: Não encontramos, em nosso estudo, diferença quanto à precisão ou acurácia de qualquer um dos guias. Alguns pacientes apresentam contraindicação, absoluta ou relativa, para o uso de um ou outro guia. Todavia, para os demais casos, não há superioridade de algum deles.

Arthroscopy: The Journal of Arthroscopic & Related Surgery, 2015

Hip Arthroscopy and Hip Joint Preservation Surgery, 2014

The deep gluteal space has increasingly received attention since the evolution in the knowledge o... more The deep gluteal space has increasingly received attention since the evolution in the knowledge of deep gluteal pain etiologies and their diagnoses. The endoscopic technique is being utilized to assess and treat deep gluteal space pathologies, improving the understanding of the sciatic nerve anatomy and biomechanics. This chapter presents a "10-step technique" for deep gluteal space endoscopic assessment and sciatic nerve decompression.

Arthroscopy: The Journal of Arthroscopic & Related Surgery, 2014

The purpose of this study was to evaluate the temperature at the sciatic nerve when using a monop... more The purpose of this study was to evaluate the temperature at the sciatic nerve when using a monopolar radiofrequency (RF) probe to control bleeding in deep gluteal space endoscopy, as well as assess the fluid temperature profile. Methods: Ten hips in 5 fresh-frozen human cadaveric specimens from the abdomen to the toes were used for this experiment. Temperatures were measured at the sciatic nerve after 2, 5, and 10 seconds of continuous RF probe activation over an adjacent vessel, a branch of the inferior gluteal artery. Fluid temperatures were then measured at different distances from the probe (3, 5, and 10 mm) after 2, 5, and 10 seconds of continuous probe activation. All tests were performed with irrigation fluid flow at 60 mm Hg allowing outflow. Results: After 2, 5, or 10 seconds of activation over the crossing branch of the inferior gluteal artery, the mean temperature increased by less than 1 C on the surface and in the perineurium of the sciatic nerve. Considering the fluid temperature profile in the deep gluteal space, the distance and duration of activation influenced temperature (P < .05). Continuous delivery of RF energy for 10 seconds caused fluid temperature increases of 1.2 C, 2 C, and 3.1 C on average at 10 mm, 5 mm, and 3 mm of distance, respectively. Conclusions: This study found the tested monopolar RF device to be safe during use in vessels around the sciatic nerve after 2, 5, and 10 seconds of continuous activation. The maximum fluid temperature (28 C) after 10 seconds of activation at 3 mm of distance is lower than the minimal reported temperature necessary to cause nerve changes (40 C to 45 C). Clinical Relevance: Monopolar RF seems to be safe to the neural structures when used at more than 3 mm of distance and with less than 10 seconds of continuous activation in deep gluteal space endoscopy with fluid inflow and outflow.

Revista Brasileira de Ortopedia (English Edition), 2014

Objective: To evaluate the results from proximal fixation of uncemented conical femoral component... more Objective: To evaluate the results from proximal fixation of uncemented conical femoral components in patients with a type C proximal femur and compare them with the results obtained from type A and B femurs. Methods: This was a retrospective study on 87 patients with 90 uncemented total hip arthroplasty procedures. Three patients (three hips) were excluded because their follow-up lasted for less than two years. The follow-up ranged from 2 to 4.3 years and the mean was 2.8 years. The Bicontact femoral implant model was used. The preoperative radiographs were evaluated, the femurs were classified as Dorr types A, B or C and the cortical indices were measured. The patients were evaluated clinically by means of the Harris Hip Score (HHS), before the surgery and at the last follow-up. The sequences of postoperative radiographs were compared regarding stability, complications and any signs of osseointegration of the femoral prosthesis. Results: Among the 87 hips with follow-up greater than two years, 32 femurs were type A (37%), 37 type B (42%) and 18 type C (21%). Before the operation, the mean HHS was 39.4 for types A and B and 38.8 for type C. At the last follow-up, the mean HHS was 89.8 for types A and B and 86 for type C. None of the 87 femoral components had been revised by the time of the last follow-up; all of them were considered stable. In 86 cases, the radiographs showed signs of osseointegration. Conclusion: There were no significant differences in the clinical results or in the fixation (and osseointegration) of conical uncemented femoral prostheses with proximal porosity, among femurs with different types of femoral morphology according to the Dorr classification. This conclusion may vary if another implant model were to be used.

FIB-4 Proceedings, 2014

cited By 0International audienc