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found that most of these factors are directly or indirectly linked to subjects’ BMI (body mass index). Thus, from a statistical perspective, BMI could be an overall indicator of the probability of femur fracture from a sideways fall. Using a biomechanics approach coupled with statistical data we investigate this relationship with a large cohort of postmenopausal women aged 50-79 from WHI-OS (Women’s Health Initiative Observational Cohort). The cohort is divided into six sub-cohorts by BMI where each fall-related factor is examined and compared with each other. Significant differences are discovered among cohorts in terms of femur size, aBMD (areal bone mineral density), peak fall force based on kinematics, and maximum von Mises stresses induced in the proximal femur. Through a probabilistic margin of safety approach which has been recently applied to orthopedic application, we found the margin of safety predicted probability to be decreasing faster with increasing BMI and better v fitted with medical record of the identical cohort compared to that found using a deterministic risk factor approach. To promote the application in other situations, tumor damaged femur bones are examined and tested for possible stress concentration effect in terms of probability of failure. The influence of tumor lesion turned out to be size and location sensitive. The superior side of the femoral neck has the highest stress concentration effect from tumor lesion where a 4mm diameter lesion could result in a 1.7 times greater maximum von Mises stress and 2.95 times greater probability of failure.

Fraturas de quadril e fêmur são um problema de saúde pública emergente, associado a um elevado índice de mortalidade e morbidade em todo mundo, com alto impacto na qualidade de vida dos pacientes. A Úlcera por Pressão (UP) é uma complicação que pode interferir para aumento destes índices. O estudo teve como objetivos identificar e caracterizar os pacientes que sofreram fratura de quadril e fêmur atendidos em um Hospital Universitário do interior Paulista; verificar a incidência e prevalência da UP e descrever a evolução das lesões até a alta; relacionar a presença de UP com as variáveis clinicas, incluindo o risco para UP por meio da Escala de Braden e o grau de independência para as Atividades de Vida Diária (AVD) pelo Índice de Katz; e analisar o valor preditivo dos escores da escala de Braden para esta população. Após aprovação pelo Comitê de Ética, foram incluídos na amostra 30 pacientes que aceitaram participar. Os dados foram coletados na admissão, no 1º dia pós-operatório ou no 5º dia de internação e na alta. Os participantes eram predominantemente do sexo feminino (53,3%), brancos (76,7%), acima dos 60 anos de idade (56,7%), alfabetizados (60%) e aposentados (33,3%). O local anatômico mais comum da fratura foi o colo do fêmur. A comorbidade mais comum foi do Sistema Cardiocirculatório (53,3%). O tempo médio entre a admissão e a cirurgia foi de 2,92 dias. O tempo total de cirurgia variou entre 2 a 4 horas. O tempo médio de internação foi 14,20 dias. A complicação mais comum no pós-operatório foi a confusão e agitação (66,7%). Em relação à independência funcional para as AVD, 50% eram totalmente dependentes na primeira e segunda avaliação e 40% no momento da alta. Quanto ao risco para UP, o escore médio da Escala de Braden na admissão foi 12,66 (DP: 2,52), no segundo momento 13,73 (DP: 3,10) e na Alta 15,03 (DP: 3,83). Para os pacientes que tiveram UP durante a internação os escores foram menores em todos os momentos (p\"0,05). A prevalência de UP foi de 33,3% e a incidência 26,6%. No momento da Alta, dos 10 casos considerados no estudo de prevalência, 9 ainda apresentavam UP. Na análise dos resultados pela regressão logística identificou-se que das covariáveis sócio-demográficas e clínicas investigadas apenas o escore da escala de Braden explicava a ocorrência da UP (p\"0,05). A análise do valor preditivo dos escores da escala de Braden pelo Teste de Fisher identificou que quanto menor a pontuação na escala, maior a quantidade de pacientes com UP no segundo e terceiro momentos (p\"0,05). / Fractures of hip and femur are an emerging public health problem, associated with a high rate of mortality and morbidity worldwide, with a high impact on the quality of life of patients. The Pressure Ulcer by (PU) is a complication that can interfere to increase these rates. The study aimed to identify and characterize the patients who suffered from hip and femur fracture treated in a University Hospital from inside Paulista; check the incidence and prevalence of UP and describe the evolution of the injury until discharge; relate the presence of the UP clinical variables, including the risk to UP by Scale of Braden and the degree of independence for the Activities of Daily Living (AVD) by Katz Index, and examine the predictive value of the scores of the scale of Braden for this population. After approval by the Ethics Committee, were included in the sample 30 patients who agreed to participate. Data were collected at admission, at 1 postoperative day or on the 5th day of hospitalization and discharge. Participants were predominantly female (53.3%), white (76.7%), over 60 years of age (56.7%), literacy (60%) and retirees (33.3%). The most common anatomical location of the fracture was the lap of the femur The most common comorbidity was System Cardiac (53.3%). The average time between admission and surgery was 2.92 days. The total time of surgery ranged from 2 to 4 hours. The average length of stay was 14.20 days. The most common complication in the postoperative period was the confusion and agitation (66.7%). Regarding the functional independence for the AVD, 50% were totally dependent on the first and second evaluation, and 40% at the time of discharge. The likelihood for UP, the scoring average of Braden Scale at admission was 12,66 (SD: 2,52), the second time 13,73 (SD: 3,10) and the High 15.03 (SD: 3,83). For patients who had UP during hospitalization the scores were lower at all times (p 0.05). The prevalence of UP was 33.3% and 26.6% incidence. At the time of Discharge, of the 10 cases considered in the study of prevalence, 9 still had UP. In the analysis of the results by logistic regression identified that the covariates socio-demographic and clinical investigated only the score of the scale of Braden explained the occurrence of UP (p 0.05). The analysis of the predictive value of the scores of the scale of the test Braden Fisher identified that the lower the score on the scale, the greater the number of patients with UP in the second and third times (p 0.05).

Often bone fractures are joined by inserting metal plates and screws to hold the fragmented bone under compression. However, after the fractured bone is healed removing the screws leaves holes in the bone which takes months to fill up and heal completely. The goal of this research is to investigate those voids specifically in a finite element model of a femur. The holes were found to experience high stress that can easily lead to crack propagations during everyday activities. Finite element models of femurs were modeled after two common fracture fixation systems, specifically just after the plates, rods and screws are removed. To observe the stress levels bones are likely to experience, common mechanical tests that are relevant to or associated with common daily activities were performed. While the 3-point bending tests did not yield significant results, the compression and torsion tests produced high stress areas near the screw holes. In certain cases, the von Mises’ stress reached 3.66 x 106 N/mm2. Our finite element modeling seeks to establish groundwork for future explorations on the holes created by fracture fixation hardware. In the future, this work will lead to redesigning of fixation systems with reduced stress concentration around the holes. Therefore, the initiation of new cracks around these holes will be limited during everyday activity.

Fraturas de quadril e fêmur são um problema de saúde pública emergente, associado a um elevado índice de mortalidade e morbidade em todo mundo, com alto impacto na qualidade de vida dos pacientes. A Úlcera por Pressão (UP) é uma complicação que pode interferir para aumento destes índices. O estudo teve como objetivos identificar e caracterizar os pacientes que sofreram fratura de quadril e fêmur atendidos em um Hospital Universitário do interior Paulista; verificar a incidência e prevalência da UP e descrever a evolução das lesões até a alta; relacionar a presença de UP com as variáveis clinicas, incluindo o risco para UP por meio da Escala de Braden e o grau de independência para as Atividades de Vida Diária (AVD) pelo Índice de Katz; e analisar o valor preditivo dos escores da escala de Braden para esta população. Após aprovação pelo Comitê de Ética, foram incluídos na amostra 30 pacientes que aceitaram participar. Os dados foram coletados na admissão, no 1º dia pós-operatório ou no 5º dia de internação e na alta. Os participantes eram predominantemente do sexo feminino (53,3%), brancos (76,7%), acima dos 60 anos de idade (56,7%), alfabetizados (60%) e aposentados (33,3%). O local anatômico mais comum da fratura foi o colo do fêmur. A comorbidade mais comum foi do Sistema Cardiocirculatório (53,3%). O tempo médio entre a admissão e a cirurgia foi de 2,92 dias. O tempo total de cirurgia variou entre 2 a 4 horas. O tempo médio de internação foi 14,20 dias. A complicação mais comum no pós-operatório foi a confusão e agitação (66,7%). Em relação à independência funcional para as AVD, 50% eram totalmente dependentes na primeira e segunda avaliação e 40% no momento da alta. Quanto ao risco para UP, o escore médio da Escala de Braden na admissão foi 12,66 (DP: 2,52), no segundo momento 13,73 (DP: 3,10) e na Alta 15,03 (DP: 3,83). Para os pacientes que tiveram UP durante a internação os escores foram menores em todos os momentos (p\"0,05). A prevalência de UP foi de 33,3% e a incidência 26,6%. No momento da Alta, dos 10 casos considerados no estudo de prevalência, 9 ainda apresentavam UP. Na análise dos resultados pela regressão logística identificou-se que das covariáveis sócio-demográficas e clínicas investigadas apenas o escore da escala de Braden explicava a ocorrência da UP (p\"0,05). A análise do valor preditivo dos escores da escala de Braden pelo Teste de Fisher identificou que quanto menor a pontuação na escala, maior a quantidade de pacientes com UP no segundo e terceiro momentos (p\"0,05). / Fractures of hip and femur are an emerging public health problem, associated with a high rate of mortality and morbidity worldwide, with a high impact on the quality of life of patients. The Pressure Ulcer by (PU) is a complication that can interfere to increase these rates. The study aimed to identify and characterize the patients who suffered from hip and femur fracture treated in a University Hospital from inside Paulista; check the incidence and prevalence of UP and describe the evolution of the injury until discharge; relate the presence of the UP clinical variables, including the risk to UP by Scale of Braden and the degree of independence for the Activities of Daily Living (AVD) by Katz Index, and examine the predictive value of the scores of the scale of Braden for this population. After approval by the Ethics Committee, were included in the sample 30 patients who agreed to participate. Data were collected at admission, at 1 postoperative day or on the 5th day of hospitalization and discharge. Participants were predominantly female (53.3%), white (76.7%), over 60 years of age (56.7%), literacy (60%) and retirees (33.3%). The most common anatomical location of the fracture was the lap of the femur The most common comorbidity was System Cardiac (53.3%). The average time between admission and surgery was 2.92 days. The total time of surgery ranged from 2 to 4 hours. The average length of stay was 14.20 days. The most common complication in the postoperative period was the confusion and agitation (66.7%). Regarding the functional independence for the AVD, 50% were totally dependent on the first and second evaluation, and 40% at the time of discharge. The likelihood for UP, the scoring average of Braden Scale at admission was 12,66 (SD: 2,52), the second time 13,73 (SD: 3,10) and the High 15.03 (SD: 3,83). For patients who had UP during hospitalization the scores were lower at all times (p 0.05). The prevalence of UP was 33.3% and 26.6% incidence. At the time of Discharge, of the 10 cases considered in the study of prevalence, 9 still had UP. In the analysis of the results by logistic regression identified that the covariates socio-demographic and clinical investigated only the score of the scale of Braden explained the occurrence of UP (p 0.05). The analysis of the predictive value of the scores of the scale of the test Braden Fisher identified that the lower the score on the scale, the greater the number of patients with UP in the second and third times (p 0.05).

Made available in DSpace on 2014-08-20T13:49:46Z (GMT). No. of bitstreams: 1 Dissertacao Fernanda Santos.pdf: 1372744 bytes, checksum: 6e4461143b107749220fa36de7e0a833 (MD5) Previous issue date: 2013-02-19 / Femur fracture is among the most common traumatic injuries in the elderly population, it presents a high mortality rate in the first year after fracture, it causes loss of functional capacity, resulting in about half of the elderly being unable to walk and in a quarter the need of extended care at home. The main objective of this research was to describe the causes of femur fractures and the profile of older adults with a diagnosis of femur fracture, hospitalized by SUS in the city of Pelotas / RS, Brazil. We opted for a cross-sectional descriptive study with elderly people who had femur fractures and were hospitalized in the Santa Casa de Pelotas Hospital, from February to August 2012. The variables were: Socioeconomic, demographic, and related to health / illness, besides the Mini Mental State Examination (MMSE). We interviewed 50 individuals, 39 women and 11 men. From the elderly fractured, mostly were white, retired, widowed, could read and write, and living with someone. Morbidity was prevalent hypertension with 56% of the sample, the majority reported continuous use of drugs and physical inactivity. The predominant mechanism of injury was falls occurred in the home of the elderly, and 78% of the elderly reported difficulty in walking before fracture. Regarding the tracking signs of dementia, 84% of elderly patients with femur fractures had cognitive impairment. Through the results presented in this research, and the aging of the population living in Brazil and in the city of study, it is relevant falls prevention campaigns among the elderly, with consequent promotion of improvement in the quality of life in this population. / A fratura de fêmur está entre as lesões traumáticas mais comuns na população de idosos, apresenta uma alta taxa de mortalidade no primeiro ano pós-fratura, causa perda da capacidade funcional, deixando cerca da metade dos idosos incapazes de deambular e um quarto necessita de cuidado domiciliar prolongado. O objetivo geral da pesquisa foi descrever as causas da fratura de fêmur e o perfil de idosos com diagnóstico de fratura de fêmur, hospitalizados pelo SUS na cidade de Pelotas/RS, Brasil. Optou-se por um estudo transversal e descritivo com idosos que tiveram fratura de fêmur e se internaram no Hospital Santa Casa de Pelotas, no período de fevereiro a agosto de 2012. As variáveis foram: dados socioeconômicos, demográficos, relacionados à saúde/doença, além do Miniexame do Estado Mental (MEEM). Foram entrevistados 50 idosos, destes, 39 mulheres e 11 homens. Os idosos fraturados, em sua maioria, eram da cor branca, aposentados, viúvos, sabiam ler e escrever, e residiam com alguém. A morbidade prevalente foi a HAS, com 56% da amostra; a maioria relatou fazer uso contínuo de medicamentos e não realizar atividade física. O mecanismo do trauma predominante foi a queda ocorrida dentro do domicílio do idoso, e 78% dos idosos referiram dificuldade para caminhar antes da fratura. Em relação ao rastreamento de sinais de demência, teve-se que 84% dos idosos com fratura de fêmur apresentavam déficit cognitivo. Por meio dos resultados apresentados nesta pesquisa, e pelo processo de envelhecimento da população vivenciado no Brasil e na cidade do estudo, se fazem pertinentes campanhas de prevenção às quedas entre os idosos, com consequente promoção da melhora da qualidade de vida desta população.

Diese retrospektive Studie untersucht 351 Patienten mit 358 proximalen Femurfrakturen, die zwischen 01/2008 und 12/2010 im Universitätsklinikum Göttingen behandelt wurden. Ziel war es, das Patientengut mit proximalen Femurfrakturen zu analysieren und Einflüsse der Versorgung sowie der Komorbiditäten auf die Komplikationen und das Outcome der Patienten herauszufinden. Alter und Geschlechterverteilung in diesem Patientengut entsprechen weitgehend den in der Literatur publizierten Angaben. Auffallend ist in dieser Untersuchung, dass Raucher und ehemalige Raucher zum Zeitpunkt der Fraktur signifikant jünger waren als Nichtraucher. Ebenso waren alkoholabhängige und ehemals alkoholabhängige Patienten signifikant jünger als Patienten, die keinen Alkoholabusus betrieben. Die Aussagekraft dieser Ergebnisse wird jedoch durch die geringen Fallzahlen der hier angesprochenen Teilgruppen gemindert. Dennoch ist ein Zusammenhang zwischen Rauchen/Alkoholkonsum und einer in jüngerem Lebensalter auftretenden Fraktur wahrscheinlich. Die höchste Krankenhausliegedauer wiesen Patienten nach H-TEP-Implantation sowie nach Schraubenosteosynthesen auf. Am kürzesten lagen Patienten nach DHS-Implantation. Bezogen auf das Alter zeigten im Gesamtpatientengut die 70-79-jährigen Patienten die längste Krankenhausaufenthaltsdauer. Hinsichtlich der Osteoporosetherapie muss nach den Ergebnissen dieser Studie von einer Minderversorgung in Diagnostik und Therapie ausgegangen werden. Postoperativ stieg der prozentuale Anteil entsprechend therapierter Patienten zwar leicht an, gemessen am Alter und dem Wissen über das Vorkommen von osteoporotischen Frakturen muss aber davon ausgegangen werden, dass bei deutlich mehr Patienten eine Antiosteoporosemedikation dringend notwendig wäre. Die häufigsten medizinischen Komplikationen waren Anämien, Elektrolytentgleisungen und Durchgangssyndrome. Die häufigsten chirurgischen Komplikationen waren Hämatome und Wundheilungsstörungen, gefolgt von mechanischen Komplikationen und Infektionen. Ein Zusammenhang zwischen Hämatomen, Wundheilungsstörungen und Infektionen mit einer präoperativen Antikoagulantientherapie konnte nicht festgestellt werden. Patienten mit Wundinfektionen waren multimorbider als das Gesamtpatientenkollektiv. Eine Zunahme der Komplikationsrate mit dem Alter konnte in dieser Untersuchung nicht nachgewiesen werden. Patienten mit chirurgischen Komplikationen waren geringfügig jünger als die Gesamtgruppe. Bei der Versorgung von Schenkelhalsfrakturen erwiesen sich die Osteosynthesen anfälliger 71 gegenüber chirurgischen Komplikationen als Endoprothesen. Pertrochantäre Frakturen hatten eine erhöhte chirurgische Komplikationsrate bei der DHS im Vergleich zu intramedullären Nagelsystemen. Zeitnah nach der Aufnahme operierte Patienten waren jünger als spät operierte Patienten. Je später der Operationszeitpunkt, desto höher war die ASA-Einstufung. Entsprechend nahmen später als 24 Stunden und innerhalb von sechs bis 24 Stunden operierte Patienten mehr Medikamente ein als die innerhalb von sechs Stunden operierten Patienten. Die später als 24 Stunden Operierten lagen deutlich länger im Krankenhaus als die früher Operierten. Hinsichtlich des Auftretens von postoperativen Komplikationen konnte kein Zusammenhang mit dem Operationszeitpunkt festgestellt werden. Die im Krankenhaus verstorbenen Patienten wiesen eine im Vergleich zur Gesamtgruppe leicht erhöhte präoperative Verweildauer auf, aufgrund der geringen Fallzahlen ist die Aussagekraft aber gemindert. Die Verstorbenen waren nicht älter als das Gesamtpatientengut. Gemessen an der Anwendungshäufigkeit der Therapiemittel wiesen Patienten mit Endoprothesen eine höhere Letalität auf. Häufig waren Hochrasanz- oder Absturztraumen Unfallursache. Die verstorbenen Patienten, die durch einen banalen Sturz die Fraktur erlitten, waren multimorbider als die Gesamtgruppe.

Atypical Femur Fracture(AFF) is a type of stress fracture that occurs in conjunction with prolonged bisphosphonate treatment. In practice, AFF is very rarely identified from Normal Femur Fracture(NFF) correctly on the first diagnostic X-ray examination. This project aims at developing an algorithm based on deep neural networks to assist clinicians with the diagnosis of atypical femurfracture. Two diagnostic pipelines were constructed using the Convolutional Neural Network (CNN) as the core classifier. One is a fully automatic pipeline, where the X-rays image is directly input into the network with only standardized pre-processing steps. Another interactive pipeline requires the user to re-orient the femur bones above the fractures to a vertical position and move the fracture line to the image center, before the repositioned image is sent to the CNNs. Three most popular CNNs architectures, namely VGG19, InceptionV3 and ResNet50,were tested for classifying the images to either AFF or NFF. Transfer learning technique was used to pre-train these networks using images form ImageNet. The diagnosis accuracy was evaluated using 5-fold cross-validation. With the fully automatic diagnosis pipeline, we achieved diagnosis accuracy of 82.7%, 89.4%, 90.5%, with VGG19, InceptionV3 and ResNet50, respectively. With the interactive diagnostic pipeline, the diagnosis accuracy was improved to 92.2%, 93.4% and 94.4%, respectively. To further validate the results, class activation mapping is used for indicating the discriminative image regions that the neural networks learn to identify a certain class.

The rarity and subtle radiographic features of atypical femoral fractures (AFF) make it difficult to distinguish radiologically from normal femoral fractures (NFF). Compared with NFF, AFF has subtle radiological features and is associated with the long-term use of bisphosphonates for the treatment of osteoporosis. Automatically classifying AFF and NFF not only helps improve the diagnosis rate of AFF but also helps patients receive timely treatment. In recent years, automatic classification technologies for AFF and NFF have continued to emerge, including but not limited to the use of convolutional neural networks (CNNs), vision transformers (ViTs), and multimodal deep learning prediction models. The above methods are all based on deep learning and require the use of centralized radiograph datasets. However, centralizing medical radiograph data involves issues such as patient privacy and data heterogeneity. Firstly, radiograph data is difficult to share among hospitals, and relevant laws or guidelines prohibit the dissemination of these data; Second, there were overall radiological differences among the different hospital datasets, and deep learning does not fully consider the fusion problem of these multi-source heterogeneous datasets. Based on federated learning, we implemented a distributed deep learning strategy to avoid the use of centralized datasets, thereby protecting the local radiograph datasets of medical institutions and patient privacy. To achieve this goal, we studied approximately 4000 images from 72 hospitals in Sweden, containing 206 AFF patients and 744 NFF patients. By dispersing the radiograph datasets of different hospitals across 3-5 nodes, we can simulate the real-world data distribution scenarios, train the local models of the nodes separately, and aggregate the global model, combined with percentile privacy protection, to further protect the security of the local datasets; in addition, we compare the performance of federated learning models using different aggregation algorithms (FedAvg, FedProx, and FedOpt). In the end, the federated learning global model we obtained is better than these local training models, and the performance of federated learning models is close to the performance of the centralized learning model. It is even better than the centralized learning model in some metrics. We conducted 3-node and 5-node federation learning training respectively. Limited by the data set size of each node, 5-node federated learning does not show any more significant performance than 3-node federated learning. Federated learning is more conducive to collaborative training of high-quality prediction models among medical institutions, but also fully protects sensitive medical data. We believe that it will become a paradigm for collaborative training models in the foreseeable future.