Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

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Métodos: Estratégia de busca: abrangeu CENTRAL, MEDLINE, EMBASE e LILACS. Não houve restrições de idioma ou meios de publicações. A última estratégia de busca foi realizada em julho de 2009. Critério de seleção: foram incluídos ensaios clínicos randomizados e quase-randomizados que avaliaram o tratamento de fratura aguda e pseudartrose do terço médio da clavícula em adultos e adolescentes. Os desfechos primários foram: dor, qualidade de vida/função do ombro e falha do tratamento. Coleta e análise dos dados: dois autores, independentemente, selecionaram os estudos elegíveis, avaliaram a qualidade metodológica e extraíram os dados. Calculou-se o risco relativo com 95% de intervalo de confiança para as variáveis dicotômicas; para variáveis contínuas, a diferença entre as médias foi calculada com 95% de intervalo de confiança. Quando possível, os estudos foram agrupados. Resultados: Intervenções não cirúrgicas: dois estudos compararam imobilização em oito versus tipoia. Ambos possuíam baixo poder estatístico e alto risco de viés. Houve maiores níveis de dor e desconforto durante o tratamento nos pacientes submetidos à imobilização em oito. Um terceiro estudo, com baixo risco de viés, mas baixo poder estatístico, avaliou o ultrassom terapêutico. Não houve diferenças significantes entre o ultrassom de baixa intensidade e placebo nos desfechos avaliados. Intervenções não cirúrgicas versus cirúrgicas: Quatro estudos, dois com moderado e dois com alto risco de viés foram incluídos. Dois estudos compararam fixação com placa versus tipoia, com resultados favoráveis ao tratamento cirúrgico ao avaliar falha do tratamento e qualidade de vida/função do ombro. Outros dois estudos compararam fixação intramedular versus tratamento não cirúrgico; a cirurgia foi superior para os desfechos dor e qualidade de vida/função do ombro. Intervenções cirúrgicas: quatro estudos com baixo poder estatístico, cada qual avaliando diferentes comparações, foram incluídos; três possuíam alto risco de viés. Um estudo comparou placa de compressão de baixo contato com placa de compressão dinâmica em pseudartrose da clavícula; os pacientes tratados com placa de baixo contato apresentaram evolução melhor para: função do ombro, consolidação, retorno ao trabalho e menor incidência de sintomas relacionados ao implante. Outro estudo comparou fixação intramedular com pinos de Knowles versus fixação com placa para o tratamento de fratura aguda e pseudartrose da clavícula; a fixação intramedular acarretou em menor consumo de analgésicos após a cirurgia, menor número de complicações associadas ao implante e menor tempo cirúrgico e de internação. Um terceiro estudo, com baixo risco de viés, concluiu que a técnica de fixação tridimensional com placa ocasionou menor incidência de retardo de consolidação em relação à fixação na face superior das fraturas agudas da clavícula. Um último estudo avaliou a fixação intramedular das fraturas agudas da clavícula comparando redução fechada versus redução aberta. Houve diferenças significativas em favor da redução fechada quando avaliados os desfechos primários. Conclusão: os ensaios clínicos disponíveis na literatura não apresentam qualidade metodológica adequada e/ou poder estatístico apropriado, portanto, não há evidência suficiente para determinar quais os mais apropriados métodos de tratamento para a fratura e pseudartrose do terço médio da clavícula. Há uma tendência de melhores resultados funcionais e radiográficos a favor das intervenções cirúrgicas quando comparadas às intervenções não cirúrgicas. / Objectives: To evaluate the effectiveness of different methods of treatment for acute fracture or non-union of the middle third of the clavicle in adults and adolescents. Methods: Search strategy: We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialised Register, Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, LILACS, trial registries and reference lists of articles. No language or publication restrictions were applied. Selection criteria: Randomised and quasi-randomised controlled trials evaluating any intervention for treating fractures or non-union of the middle third of the clavicle were considered. The primary outcomes were pain, treatment failure and health-related quality of life or shoulder function. Data collection and analysis: Two authors independently selected eligible trials and three authors assessed methodological quality and cross-checked data extraction. Results: Conservative interventions: Three trials were included in this comparison. Two trials compared the figure-of-eight bandage with sling in a total of 234 participants. Both trials were underpowered and compromised by poor methodology. One trial found slightly higher pain levels in the bandage group at 15 days, and the other trial reported greater discomfort during bandage wear. There were no significant differences in functional or other outcomes reported for either trial. The third trial, which evaluated therapeutic ultrasound in 120 participants, was also underpowered but had a low risk of bias. The trial found no statistically significant difference between low-intensity pulsed ultrasound and placebo in the time to clinical fracture healing or in any of the other reported outcomes. Surgical versus conservative interventions: Four studies, two with moderate and two with high risk of bias were included. Two compared plate fixation versus sling; plate fixation showed better patient-based upper extremity outcome scores and less treatment failure. Other two trials comparing intramedullary fixation versus conservative interventions presented better upper limb function to the surgery treatment. Surgical interventions: Data from four small trials, each testing a different comparison, were included. Three trials had design features that carry a high risk of bias, limiting the strength of their findings. Low-contact dynamic compression plates appeared to be associated with significantly better upper-limb function throughout the year following surgery, earlier fracture union and return to work, and a reduced incidence of implant-associated symptoms when compared with a standard dynamic compression plate in 36 adults with symptomatic non-union of the middle third of the clavicle. One study (69 participants) compared the Knowles pin versus plate for treating middle third clavicle fractures or non-union. Knowles pins appeared to be associated with lower pain levels and use of post-operative analgesics, reduced incidence of implant-associated symptoms, and shorter operation time and hospital stay. One study (133 participants) found that a three-dimensional technique for fixation with a reconstruction plate was associated with a significantly lower incidence of symptomatic delayed union than a standard superior position surgical approach. One study (201 participants) assessed the intramedullary fixation for treating acute clavicle fractures comparing closed and opened reduction; there were statistical significant differences in favour of closed reduction with percutaneous fixation for the primary outcomes. Conclusion: There is limited evidence, from single trials only, regarding the effectiveness of different methods for treating fracture and non-union of the middle third of the clavicle. Further research is warranted. / TEDE / BV UNIFESP: Teses e dissertações

Ultrasound-guided selective C5 nerve root blocks have been described in several case reports as a safe and effective means to anesthetize the distal clavicle while maintaining innervation of the upper extremity and preserving diaphragmatic function. In this study, cadavers were injected with 5 mL of 0.5% methylene blue dye under ultrasound guidance to investigate possible proximal and distal spread of injectate along the brachial plexus, if any. Following the injections, the specimens were dissected and examined to determine the distribution of dye and the structures affected. One injection revealed dye extended proximally into the epidural space, which penetrated the dura mater and was present on the spinal cord and brainstem. Dye was noted distally to the divisions in 3 injections. The anterior scalene muscle and phrenic nerve were stained in all 4 injections. It appears unlikely that local anesthetic spread is limited to the nerve root following an ultrasound-guided selective C5 nerve root injection. Under certain conditions, intrathecal spread also appears possible, which has major patient safety implications. Additional safety measures, such as injection pressure monitoring, should be incorporated into this block, or approaches that are more distal should be considered for the acute pain management of distal clavicle fractures.

No description available.

No description available.

This doctoral thesis is devoted to studying the possibilities of using additive manufacturing (AM) and design based on computed tomography (CT), for the production of patient-specific implants within orthopedic surgery, initially in a broad perspective and, in the second part of the thesis focusing on customized clavicle osteosynthesis plates. The main AM method used in the studies is the Electron Beam Melting (EBM) technology. Using AM, the parts are built up directly from 3D computer models, by melting or in other ways joining thin layers of material, layer by layer, to build up the part. Over the last 20 years, this fundamentally new way of manufacturing and the rapid development of software for digital 3D reconstruction of anatomical models from medical imaging, have opened up entirely new opportunities for the design and manufacturing of patient-specific implants. Based on the information in a computed tomography (CT) scan, both digital and physical models of the anatomy can be created and of implants that are customized based on the anatomical models.   The main method used is a number of case studies performed, focusing on different parts of the production chain, from CT-scan to final implant, and with several aims: learning about the details of the different steps in the procedure, finding suitable applications, developing the method and trying it out. The first study was on customized hip stems, focusing on the EBM method and its special preconditions and possibilities. It was followed by a study of bone plates, designed to follow the patient-specific bone contour, in this case a tibia fracture including the whole production chain. Further, four cases of patient-specific plates for clavicle fracture fixation were performed in order to develop and evaluate the method. The plates fit towards the patient’s bone were tested in cooperation with an orthopedic surgeon at Östersund hospital. In parallel with the case studies, a method for finite element (FE) analysis of fixation plates placed on a clavicle bone was developed and used for the comparative strength analysis of different plates and plating methods. The loading on the clavicle bone in the FE model was defined on a muscle and ligament level using multibody musculoskeletal simulation for more realistic loading than in earlier similar studies.    The initial studies (papers I and II) showed that the EBM method has great potential, both for the application of customized hip stems and bone plates; in certain conditions EBM manufacturing can contribute to significant cost reductions compared to conventional manufacturing methods due to material savings and savings in file preparation time. However, further work was needed in both of the application areas before implementation. The studies on the fracture fixation using patient-specific clavicle plates indicated that the method can facilitate the work for the surgeon both in the planning and in the operating room, with the potential of a smoother plate with a better fit and screw positioning tailored to the specific fracture (paper VI). However, a large clinical trial is required to investigate the clinical benefit of using patient-specific plates. The FE simulations showed similar stress distributions and displacements in the patient-specific plates and the commercial plates (papers III to VI).   To summarize: the results of this thesis contribute to the area of digital design and AM in patient-specific implants with broad basis of knowledge regarding the technologies used and areas in which further work is needed for the implementation of the technology on a larger scale. Further, a method has been developed and initially evaluated for implementation in the area of clavicle fracture fixation, including an approach for comparing the strength of different clavicle plates.

INTRODUÇÃO: As fraturas do terço médio da clavícula representam 80% das fraturas claviculares e seu tratamento é motivo de discussão na literatura ortopédica. Estudos prévios relativos ao tratamento cirúrgico têm demonstrado bons resultados clínicos com o uso das placas de reconstrução ou a fixação intramedular elástica estável com hastes flexíveis de titânio. O objetivo deste estudo foi a comparação desses métodos no tratamento das fraturas do terço médio da clavícula, quanto aos resultados funcionais, parâmetros radiográficos, dor pós-operatória, taxa de satisfação e taxa de complicações. MÉTODOS: Neste ensaio clínico comparativo, prospectivo e randomizado, 59 pacientes com fratura desviada do terço médio da clavícula foram alocados aleatoriamente para receberem osteossíntese com placa de reconstrução (33 pacientes - grupo Placa) ou haste flexível de titânio (26 pacientes - grupo Haste). O desfecho primário do estudo foi a avaliação funcional pelo escore DASH aos 6 meses de pós-operatório. Os desfechos secundários foram: o escore DASH aos 12 meses; o escore de Constant- Murley aos 6 e 12 meses; o tempo de consolidação da fratura; o encurtamento residual; o nível de dor pela escala visual analógica no 1º pósoperatório; a taxa de pacientes satisfeitos e a taxa de complicações. RESULTADOS: Cinquenta e quatro pacientes completaram o seguimento, sendo 29 do grupo Placa e 25 do grupo Haste. O escore DASH médio aos 6 meses foi de 9,9 pontos no grupo Placa e 8,5 no grupo Haste, sem diferença estatisticamente significante (p = 0,329). Da mesma forma, não houve diferenças significantes no escore DASH aos 12 meses ou no escore de Constant aos 6 e 12 meses. O tempo de consolidação foi equivalente entre os grupos (p = 0,352), enquanto o encurtamento residual foi maior no grupo Placa, com significância estatística (p = 0,032), mas sem relevância clínica (0,4 cm). Os resultados da escala visual analógica para dor no 1º pósoperatório e a taxa de pacientes satisfeitos foram similares entre os grupos. O grupo Placa apresentou mais casos com angulação do implante (11 casos) do que o grupo Haste (um caso) (p = 0,003), enquanto o grupo Haste foi mais associado à dor relacionada ao implante (10 casos), em comparação ao grupo Placa (4 casos) (p = 0,035). Não houve diferenças significantes entre os grupos quanto às complicações maiores, incluindo falha do implante, infecção pós-operatória, pseudoartrose e reoperação. CONCLUSÕES: A osteossíntese das fraturas desviadas do terço médio da clavícula com placa de reconstrução ou haste flexível de titânio produzem resultados semelhantes quanto aos escores funcionais, tempo de consolidação, dor pós-operatória, satisfação dos pacientes e complicações maiores. As placas de reconstrução são mais suscetíveis à angulação do implante, enquanto as hastes flexíveis de titânio causam mais dor relacionada ao implante / INTRODUCTION: Midshaft clavicle fractures represent 80% of all clavicular fractures, and their treatment is controversial in the literature. Previous studies have shown good clinical results in patients with midshaft clavicular fractures treated with reconstruction plate fixation or elastic stable intramedullary nailing (ESIN). The objective of this study was to compare these methods in terms of functional results, radiographic parameters, postoperative pain, satisfaction rates and complication rates. METHODS: In this prospective, randomized, controlled trial, 59 patients with displaced midshaft clavicular fractures were randomly assigned to receive either reconstruction plate (33 patients - Plate group) or ESIN fixation (26 patients - ESIN group). The primary outcome was the DASH score at 6 months. The secondary outcomes were the following: DASH score at 12 months; Constant-Murley scores at 6 and 12 months; time to fracture union; residual shortening; visual analog scale for pain on the first post-operative day; percentage of satisfied patients; and complications rates. RESULTS: Fifty-four patients completed the follow-up, 29 in the Plante group and 25 in the ESIN group. The mean DASH score at 6 months was 9.9 in the plate group and 8.5 in the ESIN group, with no significant difference (p = 0.329). Similarly, there were no differences in the DASH score at 12 months or the Constant-Murley scores at 6 and 12 months. The time to union was equivalent between the groups (p = 0.352), whereas the residual shortening was significantly greater in the plate group (p = 0.032) but was not clinically relevant (0.4 cm). The visual analog scale scores for pain and the percentage of satisfied patients were similar between the groups. Implant bending was significantly more common in the plate group (eleven patients) than in the ESIN group (one patient) (p = 0.003), whereas hardware-related pain was more frequent in the ESIN group (10 patients vs. 4 patients) (p = 0.035). There were no differences in terms of major complications, including implant failure, postoperative infection, nonunion and reoperation. CONCLUSIONS: Reconstruction plates and ESIN yielded similar results in terms of functional results, time to union, post-operative pain, patient satisfaction and major complications in patients with displaced midshaft clavicular fractures. Reconstruction plates are more susceptible to implant bending, whereas ESIN causes more hardwarerelated pain

INTRODUÇÃO: As fraturas do terço médio da clavícula representam 80% das fraturas claviculares e seu tratamento é motivo de discussão na literatura ortopédica. Estudos prévios relativos ao tratamento cirúrgico têm demonstrado bons resultados clínicos com o uso das placas de reconstrução ou a fixação intramedular elástica estável com hastes flexíveis de titânio. O objetivo deste estudo foi a comparação desses métodos no tratamento das fraturas do terço médio da clavícula, quanto aos resultados funcionais, parâmetros radiográficos, dor pós-operatória, taxa de satisfação e taxa de complicações. MÉTODOS: Neste ensaio clínico comparativo, prospectivo e randomizado, 59 pacientes com fratura desviada do terço médio da clavícula foram alocados aleatoriamente para receberem osteossíntese com placa de reconstrução (33 pacientes - grupo Placa) ou haste flexível de titânio (26 pacientes - grupo Haste). O desfecho primário do estudo foi a avaliação funcional pelo escore DASH aos 6 meses de pós-operatório. Os desfechos secundários foram: o escore DASH aos 12 meses; o escore de Constant- Murley aos 6 e 12 meses; o tempo de consolidação da fratura; o encurtamento residual; o nível de dor pela escala visual analógica no 1º pósoperatório; a taxa de pacientes satisfeitos e a taxa de complicações. RESULTADOS: Cinquenta e quatro pacientes completaram o seguimento, sendo 29 do grupo Placa e 25 do grupo Haste. O escore DASH médio aos 6 meses foi de 9,9 pontos no grupo Placa e 8,5 no grupo Haste, sem diferença estatisticamente significante (p = 0,329). Da mesma forma, não houve diferenças significantes no escore DASH aos 12 meses ou no escore de Constant aos 6 e 12 meses. O tempo de consolidação foi equivalente entre os grupos (p = 0,352), enquanto o encurtamento residual foi maior no grupo Placa, com significância estatística (p = 0,032), mas sem relevância clínica (0,4 cm). Os resultados da escala visual analógica para dor no 1º pósoperatório e a taxa de pacientes satisfeitos foram similares entre os grupos. O grupo Placa apresentou mais casos com angulação do implante (11 casos) do que o grupo Haste (um caso) (p = 0,003), enquanto o grupo Haste foi mais associado à dor relacionada ao implante (10 casos), em comparação ao grupo Placa (4 casos) (p = 0,035). Não houve diferenças significantes entre os grupos quanto às complicações maiores, incluindo falha do implante, infecção pós-operatória, pseudoartrose e reoperação. CONCLUSÕES: A osteossíntese das fraturas desviadas do terço médio da clavícula com placa de reconstrução ou haste flexível de titânio produzem resultados semelhantes quanto aos escores funcionais, tempo de consolidação, dor pós-operatória, satisfação dos pacientes e complicações maiores. As placas de reconstrução são mais suscetíveis à angulação do implante, enquanto as hastes flexíveis de titânio causam mais dor relacionada ao implante / INTRODUCTION: Midshaft clavicle fractures represent 80% of all clavicular fractures, and their treatment is controversial in the literature. Previous studies have shown good clinical results in patients with midshaft clavicular fractures treated with reconstruction plate fixation or elastic stable intramedullary nailing (ESIN). The objective of this study was to compare these methods in terms of functional results, radiographic parameters, postoperative pain, satisfaction rates and complication rates. METHODS: In this prospective, randomized, controlled trial, 59 patients with displaced midshaft clavicular fractures were randomly assigned to receive either reconstruction plate (33 patients - Plate group) or ESIN fixation (26 patients - ESIN group). The primary outcome was the DASH score at 6 months. The secondary outcomes were the following: DASH score at 12 months; Constant-Murley scores at 6 and 12 months; time to fracture union; residual shortening; visual analog scale for pain on the first post-operative day; percentage of satisfied patients; and complications rates. RESULTS: Fifty-four patients completed the follow-up, 29 in the Plante group and 25 in the ESIN group. The mean DASH score at 6 months was 9.9 in the plate group and 8.5 in the ESIN group, with no significant difference (p = 0.329). Similarly, there were no differences in the DASH score at 12 months or the Constant-Murley scores at 6 and 12 months. The time to union was equivalent between the groups (p = 0.352), whereas the residual shortening was significantly greater in the plate group (p = 0.032) but was not clinically relevant (0.4 cm). The visual analog scale scores for pain and the percentage of satisfied patients were similar between the groups. Implant bending was significantly more common in the plate group (eleven patients) than in the ESIN group (one patient) (p = 0.003), whereas hardware-related pain was more frequent in the ESIN group (10 patients vs. 4 patients) (p = 0.035). There were no differences in terms of major complications, including implant failure, postoperative infection, nonunion and reoperation. CONCLUSIONS: Reconstruction plates and ESIN yielded similar results in terms of functional results, time to union, post-operative pain, patient satisfaction and major complications in patients with displaced midshaft clavicular fractures. Reconstruction plates are more susceptible to implant bending, whereas ESIN causes more hardwarerelated pain

Although axillary artery injury occurs frequently with dislocations of the shoulder and fractures of the clavicle, it is rarely associated with fractures of the proximal humerus. If the axillary artery is damaged, prompt recognition and treatment are necessary to salvage the involved extremity.