Objective Comparative biomechanical analysis of tibial fixation strength for ligament reconstruction with interference screw compared with screw post and washer, and compared with the associated fixation of both methods (hybrid fixation). Method A total of 54 specimens were used (porcine tibias and bovine flexor digital tendons), which were divided into three groups with fixation types similar to those used in anterior cruciate ligament (ACL) reconstruction: 1) fixation with interference screw; 2) fixation with screw post and toothed washer over knot and suture strand; and )- fixation with screw post and washer combined with interference screw (hybrid fixation). The analyses were performed through pull-out biomechanical tensile tests to determine the stiffness and load to system failure (yield load). Results The hybrid fixation group presented a significantly higher final stiffness (59.10 ± 3.45 N/mm) in comparison to the other groups ( p < 0.05) and a higher yield load (581.34 ± 33.48 N) compared to the interference screw group ( p < 0.05). Conclusion Hybrid fixation had biomechanical advantages over the bovine digital flexor graft fixation system in swine tibia during tensile tests.
The present study aimed to evaluate the effect of dipyridamole, an indirect adenosine 2A receptors (A2AR), on the osseointegration of titanium implants in a large, translational pre-clinical model. Sixty tapered, acid-etched titanium implants, treated with four different coatings ((i) Type I Bovine Collagen (control), (ii) 10 μM dipyridamole (DIPY), (iii) 100 μM DIPY, and (iv) 1000 μM DIPY), were inserted in the vertebral bodies of 15 female sheep (weight ~65 kg). Qualitative and quantitative analysis were performed after 3, 6, and 12 weeks in vivo to assess histological features, and percentages of bone-to-implant contact (%BIC) and bone area fraction occupancy (%BAFO). Data was analyzed using a general linear mixed model analysis with time in vivo and coating as fixed factors. Histomorphometric analysis after 3 weeks in vivo revealed higher BIC for DIPY coated implant groups (10 μM (30.42% ± 10.62), 100 μM (36.41% ± 10.62), and 1000 μM (32.46% ± 10.62)) in comparison to the control group (17.99% ± 5.82). Further, significantly higher BAFO was observed for implants augmented with 1000 μM of DIPY (43.84% ± 9.97) compared to the control group (31.89% ± 5.46). At 6 and 12 weeks, no significant differences were observed among groups. Histological analysis evidenced similar osseointegration features and an intramembranous-type healing pattern for all groups. Qualitative observation corroborated the increased presence of woven bone formation in intimate contact with the surface of the implant and within the threads at 3 weeks with increased concentrations of DIPY. Coating the implant surface with dipyridamole yielded a favorable effect with regard to BIC and BAFO at 3 weeks in vivo. These findings suggest a positive effect of DIPY on the early stages of osseointegration.
Weiss FP; Zerbini T. Relação entre achados ultrassonográficos de tendinopatia e bursopatia de ombro e incapacidade para o trabalho. Saúde, Ética & Justiça. 2013;18(2):157-66. RESUMO:Achados como tendinopatia e bursopatia são comumente encontrados em exames de ultrassonografia de ombro, mas nem sempre geram repercussão clínica. Consequentemente, tais achados não são interpretados pelo médico perito como doença ou lesão. Isso acaba gerando muitas contestações por procuradores e juízes a respeito da qualidade técnica do laudo pericial. O presente estudo tem por objetivo avaliar a interpretação dos médicos peritos quanto à relação entre os achados de tendinopatia e bursopatia em exames de ultrassonografia do ombro e a incapacidade para o trabalho. Para isso, foram analisados os laudos periciais entre 01.08.2013 e 01.12.2013 do Juizado Especial Federal Previdenciário de Curitiba nos quais o avaliado tinha como queixa principal a dor no ombro, e que os achados ultrassonográficos fossem condizentes com objetivo do estudo. Os resultados foram avaliados considerando os sinais clínicos encontrados, os achados dos exames ultrassonográficos e a determinação de incapacidade para o trabalho. Dentre os 21 indivíduos incluídos no trabalho, houve correspondência entre as alterações ultrassonográficas e positividade dos testes clínicos em 42,8% dos casos. No entanto, destes, apenas 33% foram definidos com portadores de incapacidade para o trabalho. Com base neste estudo concluiu-se que apenas 14,3% dos indivíduos que apresentavam as alterações ultrassonográficas estudadas foram considerados incapazes para o trabalho, o que evidencia que somente achados isolados de exames complementares não são determinantes para a avaliação da capacidade laboral. DESCRITORES: Bainha rotadora; Ultrassonografia; Avaliação de desempenho profissional.
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