Cervical spine injury can range from minor to severe or fatal, where severe injuries can result in incomplete or complete quadriplegia. There are close to 45,000 Canadians currently affected by paralysis due to traumatic spinal cord injury (tSCI) with an estimated 1700 new cases each year. The majority of tSCI occur in automotive collisions, and current methods for injury prediction are limited to predicting the likelihood for occupant injury but lack the detail to predict the specific injury and location at the tissue level. This research focused on major injuries associated with high impact automotive collisions such as rollover type collisions. Although whiplash is an injury commonly associated with automotive collisions, it was not considered for this study based on the low risk of neurological impairment. The goal of this study was to develop a cervical spine segment finite element model capable of predicting severe injuries such as ligament tears, disc failure, and bone fracture. The segment models used in this study were developed from previous cervical spine segment models representative of a 50th percentile male. The segment models included the vertebrae, detailed representations of the disc annulus fibres and nucleus, and the associated ligaments. The original model was previously verified and validated under quasi-static loading conditions for physiological ranges of motion. To accomplish the objectives of this research, the original models were modified to include updated material properties with the ability to represent tissue damage corresponding to injuries. Additional verification of the model was required to verify that the new material properties provided a physically correct response. Progressive failure was introduced in the ligament elements to produce a more biofidelic failure response and a tied contact between the vertebral bony endplates and the disc was used to represent disc avulsion. To represent the onset of bone fracture, a critical plastic strain failure criterion was implemented, and elements exceeding this criterion were eroded. The changes made to the material models were based on experimental studies and were not calibrated to produce a specific result. After verifying the modifications were implemented successfully, the models were validated against experimental segment failure tests. Modes of loading investigated included tension, compression, flexion, extension and axial rotation. In each case, the simulated response of the segment was evaluated against the average failure load, displacement at failure, and the observed injuries reported in the experimental studies. Additionally, qualitative analysis of elevated stress locations in the model were compared to reported fracture sites. Overall, the simulations showed good agreement with the experimental failure values, and produced tissue failure that was representative of the observed tissue damage in the experimental tests. The results of this research have provided a solid basis for cervical spine segment level injury prediction. Some limitations include the current implementation of bone fracture under compressive loads, and failure within the annulus fibrosus fibres of the disc should be investigated for future models. In addition to material model modifications, further investigation into the kinetics and kinematics of the upper cervical spine segment are important to better understand the complex interactions between the bone geometry and ligaments. This would give insight into the initial positioning and expected response in subsequent models. Future research will include integrating the current segment-level failure criteria into a full cervical spine model for the purpose of predicting severe cervical spine injury in simulated crash scenarios, with future applications in sports injury prevention and protective equipment.

Background: Cervical cancer is the second most common cancer among women worldwide and its incidence is higher for certain ethnic groups in Canada, compared to White Canadians. As more women immigrate to Canada, the potential for prevention increases. Failure to prevent cervical cancer is partly due to non-participation in regular screening. The objectives of the research were to (1) explore whether there are cervical cancer screening differences between non-immigrant and immigrant women; (2) explore cervical cancer screening decision-making among immigrant women; and (3) explore the influence of acculturation on cervical cancer screening. Methods: This research consisted of two studies. The first study consisted of quantitative analysis of the 2007-2008 Canadian Community Health Survey (CCHS). Univariate analyses, cross-tabulations, and logistic regression modeling were conducted. Analyses were restricted to women aged 18-69 years old living in Ontario with no history of hysterectomy. Sample weights were applied and bootstrapping was performed. Analyses were conducted on the full Ontario sample (unweighted n=13,549) and the immigrant sample (unweighted n=2,904), the latter of which was stratified into two groups based on self-reported cultural/racial background: immigrant women more likely to report a time-appropriate Pap test (low risk) and those less likely to report a time-appropriate Pap test (high risk). The second study consisted of interviews conducted with 22 older (aged 50-69 years) South Asian immigrant women from Waterloo and Toronto, Ontario. The descriptive qualitative study was informed by grounded theory methodology. Interviews were audio-recorded and transcribed. Results: The first study identified that almost 17% of women reported not having a time-appropriate Pap test. Immigrant women were more likely to report not having a time-appropriate Pap test (21.73%) compared to non-immigrants (14.22%). Among immigrant women, almost 17% of White, Black, and other women (low-risk group) did not report a recent Pap test, compared to 28.67% of Chinese, South Asian, and other Asian women (high-risk group). Among the full Ontario sample, not having a time-appropriate Pap test was associated with being 50-69 years old, single, having low education and income, not having a regular doctor, being of Asian (Chinese, South Asian, other Asian) cultural/racial background, perceiving having less than excellent health, and being a recent immigrant. Among women in the low-risk group, not having a recent Pap test was associated with older age, lower household income, not having a regular doctor, and a lower proportion of life spent in Canada. Among women in the high-risk group, not having a time-appropriate Pap test was associated with lower education and not having a regular doctor. Within the second study, various themes emerged exploring cervical cancer screening decision-making among the sample. Six major categories emerged: (1) the influence of others, (2) health beliefs and knowledge, (3) responsibility over health, (4) experiences in healthcare, (5) components of culture, and (6) the process of acculturation. The influence of doctors on cervical cancer screening decision-making emerged as a strong theme within interviews. Conclusion: Results provide insight into the inequities that still exist in terms of who is participating in cervical cancer screening, as well as the factors involved in screening decision-making and the relationships between them. This research provides an updated overview of Pap test participation in Ontario, as well as advancing our understanding of the influence of factors on screening decision-making among immigrant women. Through this research, it becomes clear that targeted efforts must be directed towards those less likely to get a Pap test.

No description available.

Background: Cervical cancer is the second most common cancer among women worldwide and its incidence is higher for certain ethnic groups in Canada, compared to White Canadians. As more women immigrate to Canada, the potential for prevention increases. Failure to prevent cervical cancer is partly due to non-participation in regular screening. The objectives of the research were to (1) explore whether there are cervical cancer screening differences between non-immigrant and immigrant women; (2) explore cervical cancer screening decision-making among immigrant women; and (3) explore the influence of acculturation on cervical cancer screening. Methods: This research consisted of two studies. The first study consisted of quantitative analysis of the 2007-2008 Canadian Community Health Survey (CCHS). Univariate analyses, cross-tabulations, and logistic regression modeling were conducted. Analyses were restricted to women aged 18-69 years old living in Ontario with no history of hysterectomy. Sample weights were applied and bootstrapping was performed. Analyses were conducted on the full Ontario sample (unweighted n=13,549) and the immigrant sample (unweighted n=2,904), the latter of which was stratified into two groups based on self-reported cultural/racial background: immigrant women more likely to report a time-appropriate Pap test (low risk) and those less likely to report a time-appropriate Pap test (high risk). The second study consisted of interviews conducted with 22 older (aged 50-69 years) South Asian immigrant women from Waterloo and Toronto, Ontario. The descriptive qualitative study was informed by grounded theory methodology. Interviews were audio-recorded and transcribed. Results: The first study identified that almost 17% of women reported not having a time-appropriate Pap test. Immigrant women were more likely to report not having a time-appropriate Pap test (21.73%) compared to non-immigrants (14.22%). Among immigrant women, almost 17% of White, Black, and other women (low-risk group) did not report a recent Pap test, compared to 28.67% of Chinese, South Asian, and other Asian women (high-risk group). Among the full Ontario sample, not having a time-appropriate Pap test was associated with being 50-69 years old, single, having low education and income, not having a regular doctor, being of Asian (Chinese, South Asian, other Asian) cultural/racial background, perceiving having less than excellent health, and being a recent immigrant. Among women in the low-risk group, not having a recent Pap test was associated with older age, lower household income, not having a regular doctor, and a lower proportion of life spent in Canada. Among women in the high-risk group, not having a time-appropriate Pap test was associated with lower education and not having a regular doctor. Within the second study, various themes emerged exploring cervical cancer screening decision-making among the sample. Six major categories emerged: (1) the influence of others, (2) health beliefs and knowledge, (3) responsibility over health, (4) experiences in healthcare, (5) components of culture, and (6) the process of acculturation. The influence of doctors on cervical cancer screening decision-making emerged as a strong theme within interviews. Conclusion: Results provide insight into the inequities that still exist in terms of who is participating in cervical cancer screening, as well as the factors involved in screening decision-making and the relationships between them. This research provides an updated overview of Pap test participation in Ontario, as well as advancing our understanding of the influence of factors on screening decision-making among immigrant women. Through this research, it becomes clear that targeted efforts must be directed towards those less likely to get a Pap test.

Botulinum toxin (BTX) is used in various fields of medicine, including the treatment of hyperhidrosis and cervical dystonia. Botox®, Dysport®, Xeomin® and NeuroBloc® are commercially available BTX products, which are formulated differently and their dosing units are unique. Dosage and concentration of the prepared solution for injection varies considerably among studies comparing the products. Improved guidelines on concentration and dosing when changing from one product to another are warranted. This would ensure the use of the lowest effective doses for good effect, minimal risk of antibody formation and side-effects as well as reduced costs. The aim of the present work was to find the most appropriate BTX concentration for each of the four products to achieve the highest sweat reducing effect and to investigate dose conversion ratios between Botox and Dysport in the treatment of cervical dystonia when the products are diluted to the same concentration, 100 U/ml. Paper I and II clearly confirm that it is crucial to consider the BTX concentration in a treatment regimen, especially when changing between different products. The optimal concentration to reduce sweating varies among the products and was found to be 25 U/ml for Botox and Xeomin, approximately 100 U/ml for Dysport and 50 U/ml for NeuroBloc. However, for NeuroBloc the optimal concentration might be even lower. In Paper III, which is a retrospective study using casebook notes from 75 patients with cervical dystonia, it was found that the most appropriate dose conversion ratio to use when switching from Botox to Dysport was 1:1.7. In Paper IV, Botox and Dysport were prospectively compared in a double-blind, randomized clinical trial in two different dose conversion ratios (1:3 and 1:1.7) when diluted to the same concentration (100 U/ml). No statistically significant difference was seen between Botox (1:3) and Dysport nor between Botox (1:1.7) and Dysport four weeks after treatment. Some of the secondary outcome observations, however, did indicate that the ratio 1:3 resulted in suboptimal efficacy of Botox but this must be further validated in a larger patient material.

This study addressed the lack of knowledge regarding the epidemiology of waking symptoms attributable to the cervico-thoraic spine. Five inter-linked studies were undertaken to investigate the relationships between reports of waking cervical pain, cervical stiffness, headache and scapular pain, cervico-thoracic spine posture in the side lying position and anthropometry. This has culminated in evidence based advice regarding pillow use. / Thesis (PhD)--University of South Australia, 2004.

Thesis (MPhysio)--University of South Australia, 1998

Thesis (MAppSc) -- University of South Australia, 1997

Thesis (MAppSc) -- University of South Australia, 1997

Human Papillomavirus (HPV) is one of the most common causes of sexually transmitted disease worldwide. Infections by high-risk HPVs, such as HPV-18, have been associated etiologically with cervical cancer. The successful development of HPV vaccines may be beneficial to the HPV-na??ve population, but women that have already been exposed to the virus are still at risk of developing HPV-associated malignancies. A need for a systemic cure for HPV-infection therefore still exists. Gene therapies using tissue-specific promoters have been reported to be a promising tool for treating cancers; however, few studies have explored this possibility for cervical cancer. The aim of this project is to construct a gene expression vector that can specifically target HPV-infected cervical cancer cells, by making use of the activity and selectivity of the P105 promoter which is determined by transcription control elements within the HPV-18 long control region (LCR). The first part of this study involved the construction of LCR deletion plasmids, and examining the subsequent level of gene expression induced within different mammalian cell lines. The results suggest the LCR to be capable in achieving cervical cancer-specific gene expression. The 3′-end of the viral L1 gene upstream of the LCR appeared to have a repressive effect on the promoter and therefore should be excluded for maximum LCR promoter activity. The second part of the project involved site-directed mutagenesis studies performed on selected transcription factor binding sites with an attempt to further increase the level of LCR promoter activity and specificity towards HPV-infected cervical cancer cells. The results suggest that a GRE/YY1 mutation may significantly enhance promoter activity. In terms of promoter regulation, the E2BSs appeared to be responsible for promoter activation in the absence of viral E2 proteins. The findings of this study suggest a possible gene therapy approach towards the treatment of cervical cancer. By making use of the activity and specificity of the HPV-18 P105 promoter to induce cervical carcinoma-specific expression of appropriate therapeutic genes, suicidal phenotypes can be introduced selectively within HPV-positive cervical cancer cells while normal HPV-negative cells are unaffected.