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1.
Acta ortop. bras ; 26(1): 67-71, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-886513

ABSTRACT

ABSTRACT Objective: The aim of the present study was to investigate the biochemical and histopathological impact of ozone treatment in an experimental model of osteomyelitis in rats. Methods: A total of 24 adult male Sprague-Dawley rats (3 months old, each weighing 300 to 400 g) were randomly allocated into three groups. Group I (n=8) served as a control and received no interventions or medications. In Group II (n=8), osteomyelitis was induced in the femur and no treatment was applied. Group III (n=8) received intraperitoneal ozone treatment for 3 weeks after the formation of osteomyelitis in the femur. Serum samples were taken to assess total antioxidant capacity (TAC), protein carbonyl content (PCO), and lactate dehydrogenase (LDH). Bone specimens obtained from the femur were histopathologically evaluated for inflammation, necrosis, osteomyelitis, and abscess formation. Results: Serum TAC levels were notably higher (p<0.001), while LDH levels were lower (p=0.002) in Group III than Group II. No significant difference was detected between groups with respect to PCO level. Similarly, Group III displayed more favorable histopathological outcomes with respect to osteomyelitis (p=0.008), inflammation (p=0.001), necrosis (p=0.022), and abscess formation (p=0.022). Conclusion: Ozone may be a useful adjunct treatment for osteomyelitis. Further studies in animals and humans are needed to clarify and confirm these preventive effects, understand the underlying pathophysiology, and establish guidelines. Level of Evidence II; Prospective comparative study.


RESUMO Objetivo: O objetivo do presente estudo foi investigar o impacto bioquímico e histopatológico do tratamento de ozônio em modelo experimental de osteomielite em ratos. Métodos: Vinte e quatro ratos Sprague-Dawley machos adultos (3 meses de idade, pesando de 300 a 400 g) foram alocados randomicamente em três grupos. O grupo I (n = 8) serviu como controle. No Grupo II (n = 8), o modelo de osteomielite experimental foi induzido no fêmur e não foi aplicado nenhum tratamento. O grupo III (n = 8) recebeu tratamento com ozônio intraperitoneal por 3 semanas depois da formação de osteomielite no fêmur. Foram coletadas amostras de sangue para avaliar a capacidade antioxidante total (CAT), a concentração da proteína carbonil (PCO) e da lactato desidrogenase (LDH) no soro. As amostras do fêmur foram avaliadas por histopatologia quanto a inflamação, necrose, osteomielite e formação de abscesso. Resultados: Os níveis séricos de TAC foram notavelmente maiores (p < 0,001), enquanto os níveis de LDH foram menores (p = 0,002) no Grupo III em comparação com o Grupo II. Nenhuma diferença significativa foi detectada entre os grupos com relação ao nível de PCO. Do mesmo modo, o Grupo III apresentou resultados histopatológicos mais favoráveis para osteomielite (p = 0,008), inflamação (p = 0,001), necrose (p = 0,022) e formação de abscesso (p = 0,022). Conclusão: O ozônio pode ser um tratamento adjuvante útil na osteomielite. Mais estudos com animais e com seres humanos são necessários para esclarecer e confirmar esses efeitos preventivos, compreender a fisiopatologia subjacente e estabelecer diretrizes. Nível de Evidência II; Estudo prospectivo comparativo.

2.
Ciênc. rural (Online) ; 48(7): e20170206, 2018. tab, graf
Article in English | LILACS | ID: biblio-1045163

ABSTRACT

ABSTRACT: Peritendinous adhesions are a significant problem in tendon surgery. One of the most preferred methods for preventing adhesion formation is anti-adhesive applications. This study aimed to investigate the efficacy of natural synovial fluid as an alternative viscoelastic agent for preventing adhesion in the healing period compared to hyaluronic acid. Thirty adult New Zealand rabbits were used in the study to form three experimental models. In all groups, a rupture was induced in the Achilles tendons. Following tenorrhaphy, hyaluronic acid was applied in one group and synovial fluid in the other group for anti-adhesive purposes. In the control group, no viscoelastic application was made. Bandage was applied to the operated extremities for three weeks post-operatively. At the end of five weeks, euthanasia was performed on the animals using pentobarbital sodium. Surgical sites in all groups were macroscopically examined for healing status as well as the presence and extent of adhesions. Biomechanical tests and histopathological examinations were then performed on the tendons in all groups. Findings established once again the positive contribution of hyaluronic acid to preventing adhesion formation as well as to healing and tensile strength in tendon surgery. Although, we found that it is possible to use synovial fluid, which is a natural source of hyaluronic acid, as a viscoelastic material, it is not superior to commercial hyaluronic acid preparation.


RESUMO: Asderências peritendinares são um problema significativo na cirurgia tendínea. Um dos métodos mais empregados para evitar a formação de adesão são as aplicações anti-adesivas. Este estudo tem como objetivo investigar a eficácia do líquido sinovial natural como um agente viscoelástico alternativo para prevenir a adesão no período de cicatrização comparado ao ácido hialurônico. Trinta coelhos adultos da Nova Zelândia foram utilizados no estudo para formar três modelos experimentais. Em todos os grupos, uma ruptura foi induzida nos tendões de Aquiles. Após tenorrafia, o ácido hialurônico foi aplicado em um grupo e o líquido sinovial no outro grupo para fins anti-adesivos. No grupo controle, não foi feita qualquer aplicação viscoelástica. A bandagem foi aplicada às extremidades operadas por três semanas pós-operatório. No final de cinco semanas, a eutanásia foi realizada nos animais utilizando pentobarbital sódico. Os locais cirúrgicos em todos os grupos foram examinados macroscopicamente quanto ao estado de cura, bem como a presença e extensão das aderências. Testes biomecânicos e exames histopatológicos foram realizados nos tendões em todos os grupos. Os achados estabeleceram mais uma vez a contribuição positiva do ácido hialurônico para prevenir a formação de aderências, bem como para a cicatrização e resistência à tração na cirurgia do tendão. Embora se tenha constatado que é possível utilizar fluido sinovial, que é uma fonte natural de ácido hialurónico, como material viscoelástico, não é superior à preparação de ácido hialurónico comercial.

3.
Acta cir. bras ; 31(11): 730-735, Nov. 2016. tab, graf
Article in English | LILACS | ID: biblio-827659

ABSTRACT

ABSTRACT PURPOSE: To assess and compare the histopathological effects of ozone therapy and/or methylprednisolone (MPS) treatment on regeneration after crush type sciatic nerve injury. METHODS: Forty Sprague-Dawley male rats were randomly allocated into four groups. Four groups received the following regimens intraperitoneally every day for 14 days after formation of crush type injury on sciatic nerve: Group I: ozone (20mcg/ml); Group II: methylprednisolone (2mg/kg); Group III: ozone (20 mcg/ml) and methylprednisolone (2mg/kg); Group IV: isotonic saline (0.9%). The histomorphological evaluation was made after biopsies were obtained from the sites of injury. RESULTS: Significant differences were noted between groups in terms of degeneration (p=0.019), nerve sheath cell atrophy (p=0.012), intraneural inflammatory cellular infiltration (p=0.002), perineural granulation tissue formation (p=0.019), perineural vascular proliferation (p=0.004), perineural inflammatory cellular infiltration (p<0.001) and inflammation in peripheral tissue (p=0.006). Degeneration was remarkably low in Group III, while no change in nerve sheath cell was noted in Group II. CONCLUSION: The combined use of methylprednisolone and ozone treatment can have beneficial effects for regeneration after crush type nerve injury.


Subject(s)
Animals , Male , Rats , Oxidants, Photochemical/therapeutic use , Ozone/therapeutic use , Sciatic Nerve/injuries , Methylprednisolone/therapeutic use , Peripheral Nerve Injuries/drug therapy , Nerve Regeneration/drug effects , Oxidants, Photochemical/administration & dosage , Ozone/administration & dosage , Sciatic Nerve/drug effects , Wound Healing/drug effects , Methylprednisolone/administration & dosage , Random Allocation , Rats, Sprague-Dawley , Recovery of Function/drug effects , Peripheral Nerve Injuries/physiopathology , Inflammation , Nerve Crush
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