RAFAEL TREVISAN ORTIZ
Projetos de Pesquisa
Unidades Organizacionais
Instituto de Ortopedia e Traumatologia, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
18 resultados
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- FLEXOR HALLUX TENDON TRANSFER: COMPARATIVE STUDY THROUGH DOUBLE OR SINGLE APPROACH(2014) SAKAKI, Marcos Hideyo; GODOY-SANTOS, Alexandre Leme; ORTIZ, Rafael Trevisan; ARAUJO, Antonio; FERNANDES, Tulio DinizObjective: To quantify the FHL length difference obtained through a single approach and by a double combined approach. Methods: 16 fresh cadavers, a total of 32 feet, were used to measure the FHL graft length. With the cadaver positioned in ventral decubitus, a posteromedial incision in the ankle and a second incision in the plantar cavus were performed. Results: The average gain of tendon's length (GTL) was of 42.43 mm, the lowest value being 32 mm and the largest 48 mm. The comparative analysis of the GTL on the right and left sides through the paired ""t"" Test does not show statistical differences, with a p-value = 0.463 and a statistical power of 0.1443. The height analysis of the sample and the right and left GTL performed through linear regression do not show statistically significant differences, with a p-value of 0.38311 and 0.82640, respectively. Conclusion: Harvesting the FHL graft using a double combined approach yields a 42.43 mm length gain in comparison to harvesting using the single approach.
- Charcot neuroarthropathy: realignment of diabetic foot by means of osteosynthesis using intramedullary screws – case report,(2014) SANTOS, Alexandre Leme Godoy dos; ALBINO, Rômulo Ballarin; ORTIZ, Rafael Trevisan; SAKAKI, Marcos Hideyo; CORSATO, Marcos de Andrade; FERNANDES, Tulio DinizDiabetes mellitus is a serious disease that affects a large portion of the population. Charcot neuroarthropathy is one of its major complications and can lead to osteoarticular deformities, functional incapacity, ulcers and ankle and foot infections. Realignment of the foot by means of arthrodesis presents a high rate of implant failure due to weight-bearing on an insensitive foot. The aim of this report was to describe successful use of intramedullary osteosynthesis with compression screws to stabilize the deformed foot, in a diabetic patient with neuroarthropathy.
- Epidemiological study on talus fractures(2014) SAKAKI, Marcos Hideyo; SAITO, Guilherme Honda; OLIVEIRA, Rafael Garcia de; ORTIZ, Rafael Trevisan; SILVA, Jorge dos Santos; FERNANDES, Túlio Diniz; SANTOS, Alexandre Leme Godoy dosObjective: To analyze the characteristics of patients with talus fractures and the injuries that they present. Methods: Retrospective analysis on patients hospitalized in the Institute of Orthopedics and Traumatology, Hospital das Clínicas, School of Medicine of the University of São Paulo, between 2006 and 2011, with talus fractures. Patient profile parameters, risk factors, fracture characteristics, treatment data and acute complications were analyzed. Results: Analysis on 23 cases showed that men were more affected than women, with a ratio of 4.8:1. The most frequent trauma mechanism was traffic accidents, followed by falls from a height. The most frequent type of fracture was at the neck of the talus, with 17 cases. Among the 23 cases, seven had peritalar dislocation at the time of presentation, four had exposed fractures and 11 presented other associated fractures. The mean length of time between the trauma and the definitive treatment was six days, while the mean length of hospital stay was 11 days. Three patients presented acute postoperative complications. Conclusion: Talus fractures occurred most commonly in the region of the talar neck and most frequently in young males who suffered high-energy trauma. In almost half of the cases, there were other associated fractures. The length of hospital stay was 11 days.
bookPart O exame do sistema locomotor(2021) HIRATA, Paulo Yuti; ORTIZ, Rafael Trevisan- MMP-1 promoter polymorphism is associated with primary tendinopathy of the posterior tibial tendon(2013) GODOY-SANTOS, Alexandre; CUNHA, Mirella V.; ORTIZ, Rafael Trevisan; FERNANDES, Tulio Diniz; MATTAR JR., Rames; SANTOS, Maria Cristina L. G. dosPosterior tibial tendon (PTT) dysfunction is recognized as an etiology leading to acquired flatfoot in adults, causing significant functional loss. Many risk factors and systemic conditions have been proposed in literature. However, many patients present PTT dysfunction without any of these characteristics. This suggests that there could be a genetic influence associated with posterior tibial tendinopathy. The purpose of the present study is to investigate the association of the 1607 polymorphism in the promoter gene of MMP-1 and posterior tibial tendinopathy. The test group included 50 women, who presented PTT dysfunction grade 2 or 3, and who were submitted to surgical treatment, with histopathological examination of the tendon and magnetic resonance image (MRI) confirming tendinopathy, while the control group was 100 asymptomatic women who presented intact PTT at MRI. The results were analyzed using the chi-square test. The data showed a 75% incidence of the allele 1G and 62% of the genotype 1G/1G at the control group while, at the test group, they showed a 78% incidence of the allele 2G and 72% of the genotype 2G/2G (p<0.001). The 1607 polymorphism of promoter gene of MMP-1 is associated with the posterior tibial tendinopathy in the studied population. (c) 2013 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 31:11031107, 2013
bookPart Prevenção e abordagem cirúrgica das infecções(2013) FERNANDES, Tulio Diniz; SPOSETO, Rafael Barban; ORTIZ, Rafael Trevisan; SANTOS, Alexandre Leme Godoy dos; SAKAKI, Marcos Hideyo; CORSATO, Marcos de AndradebookPart Atividades de Ortopedia(2021) CAMARGO, Olavo Pires de; ORTIZ, Rafael Trevisan- HALLUX RIGIDUS: PROSPECTIVE STUDY OF JOINT REPLACEMENT WITH HEMIARTHROPLASTY(2013) SANTOS, Alexandre Leme Godoy dos; DUARTE, Fernando Aires; SEITO, Carlos Augusto Itiu; ORTIZ, Rafael Trevisan; SAKAKI, Marcos Hideyo; FERNANDES, Tulio DinizObjective: To report the results of medium-term follow-up after deploying Arthrosurface-HemiCap (R) in patients with diagnosis of Hallux Rigidus (HR). Method: Eleven patients underwent partial Arthroplasty of the first metatarsal-phalangeal joint. Six women and five men with an average age 51.9 years (46 to 58 years) and average postoperative follow-up of 3.73 years (3-4 years); were classified through the Kravitz system and evaluated by the American Orthopaedic Foot and Ankle Society (AOFAS) scales for hallux, Visual Analogical Scale (VAS) - analog functional pain - and range of motion in the first metatarsal joint in preoperative, postoperative after six months and present post-operative. Results: The results show significant improvement of the three analyzed parameters, both for overall analysis and for pre and post-operative comparisons individually. The comparative analysis of each variable in the six months and the current postoperative periods do not show statistically significant differences, indicating maintenance of parameters during this interval. Conclusion: hemiarthroplasty of first metatarsophalangeal joint is a reproducible and safe option for the surgical treatment of hallux rigidus II and III, with significant improvement of the evaluated parameters for the studied population.
- Talar Body Reconstruction for Nonunions and Malunions(2018) SAKAKI, Marcos Hideyo; MACEDO, Rodrigo Sousa; SANTOS, Alexandre Leme Godoy Dos; ORTIZ, Rafael Trevisan; SPOSETO, Rafael Barban; FERNANDES, Tulio DinizBackground: Talar body and neck nonunions and malunions may undergo a reconstructive surgery when joint cartilage is still viable, and no talar collapse or infection has occurred. This is a rare condition and the studies supporting the procedure have small number of cases. The objective of the present study is to report a case series of six patients who underwent talar reconstructions. Materials and Methods: Six patients with talar malunions or nonunions who underwent surgical treatment were reviewed in this retrospective study. There were three nonunions and two malunions of the talar body and one malunion of the talar neck. Clinical evaluation included all the parameters used in the American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot scale. Arthritic degeneration of the ankle joint was assessed according to a modified Bargon scale. Results: The mean followup was 86 months (range 24-282 months). There were no cases of postoperative avascular necrosis of the talus. Four of the six patients in our series required a subtalar fusion as part of the reconstruction procedure. The average preoperative AOFAS hindfoot score was 34, and at the time of the last evaluation, it was 74. The mean preoperative score on the modified Bargon scale for the tibiotalar joint was 1.17. At the last followup, it rose to 1.33. Three different deformities of the talus were identified (a) flattening of the talus (b) extra-articular step and (c) intraarticular step. Conclusion: Reconstruction of talar nonunions and malunions improved function in selected patients with a low risk of complications. Three different anatomical patterns of talar nonunions and malunions were identified.
- Association of MMP-8 polymorphisms with tendinopathy of the primary posterior tibial tendon: a pilot study(2011) GODOY-SANTOS, Alexandre Leme; TREVISAN, Rafael; FERNANDES, Tulio Diniz; SANTOS, Maria Cristina L. G. dos