Background: Osteoarthritis of the hip joint causes difficulties to the elderly because it impacts their ability to conduct their normal activities of daily living, such as walking, cooking, bathing, dressing, using the toilet, and performing household chores. Moreover, the joints can become painful, stiff, and swollen. The resulting pain causes limited motion, restriction of social activities, and compromised work capacity. The interaction of these factors can affect both functional and physiological status. The normal course of action for these subjects is to be referred to an orthopedic surgeon; however, the functional and physiological impact of waiting times for hip replacement consultation or surgery on subject’s function has not been properly assessed with objective outcome measures. Objectives: The purpose of this study was to investigate the differences in objective outcome measures of functional and physiological status between subjects with hip OA who were preoperative candidates for hip surgery and those who were diagnosed with hip OA at the time of referral and time of consultation. Methods: Subjects with hip osteoarthritis were selected based on their position in the continuum of care once they had been referred to a surgeon. These groups were: referral (REF) (n=7), consultation (CON) (n=7) and pre-operatively (PREOP) (n=7). Individuals with hip OA were evaluated using functional (6MWT and TUG) and physiological (hip muscle isokinetic strength - Biodex and VO2peak) outcome measures. Results: The 6 minutes walk test (6MWT), timed up and go (TUG) and VO2peak were significantly different between the three groups (p < 0.001, p = 0.005 and p = 0.001). However, no significant difference was observed in hip flexion and extension muscle strength between groups. Post Hoc analysis revealed that the REF group walked significantly greater distances (p < 0.001) when compared to the PREOP group during the 6MWT. Both REF and CON groups showed significantly shorter times in the TUG test (p < 0.009 and p < 0.02 respectively) when compared to the PREOP group and finally the VO2peak in the REF group was significantly higher than the predicted VO2peak of the CON (p = 0.002) and the PREOP (p = 0.002) groups, respectively. Conclusion: Subjects with hip osteoarthritis who are within four weeks of surgery generally walked shorter distances, demonstrate worse mobility and balance control and a lower aerobic capacity than individuals with hip OA at the time of referral to a surgeon and at the time of consultation with the surgeon. Contrary to expectation, this study did not find differences in hip muscle strength, between those with hip osteoarthritis at the time of referral; at the time of consultation and within four weeks prior to surgery. / Thesis (Master, Rehabilitation Science) -- Queen's University, 2008-09-25 17:11:10.365

Purpose-To examine physical activity levels after THA and relate it to pain, disability, sleep, and body composition. Methods-Cross-sectional, observational study of THA patients 1-3 years post-surgery (n=17, male). 7 day accelerometry (2 second epoch, GT3X) derived step and energy related physical activity. Body composition (WC, BMI) and pain (VAS) were measured. Disability and sleep were measured using the HOOS, Oxford Hip Score, and PSQI. Results-Participants averaged 9143 (398.2) steps/day. Statistical analysis failed to show a significant difference in comparison to the age-matched normative population. Time in moderate-vigorous intensity PA was 55.8 (22.5) minutes/day; higher than the value for the age-matched normatives. VAS function was significantly correlated to step rate (r=0.483, p<0.05). Step rate was related to Oxford Hip (r=0.486, p<0.05). VAS function was found to account for 80.7% of the variance in the HOOS and 78% of the variance in the Oxford Hip Score but no PA measures were returned. Conclusion-Activity levels in the male THA population lacking co-morbidities are clinically at par with age-matched peers and near minimum activity guidelines. Traditional PA measures were unrelated to disability measures.

Purpose-To examine physical activity levels after THA and relate it to pain, disability, sleep, and body composition. Methods-Cross-sectional, observational study of THA patients 1-3 years post-surgery (n=17, male). 7 day accelerometry (2 second epoch, GT3X) derived step and energy related physical activity. Body composition (WC, BMI) and pain (VAS) were measured. Disability and sleep were measured using the HOOS, Oxford Hip Score, and PSQI. Results-Participants averaged 9143 (398.2) steps/day. Statistical analysis failed to show a significant difference in comparison to the age-matched normative population. Time in moderate-vigorous intensity PA was 55.8 (22.5) minutes/day; higher than the value for the age-matched normatives. VAS function was significantly correlated to step rate (r=0.483, p<0.05). Step rate was related to Oxford Hip (r=0.486, p<0.05). VAS function was found to account for 80.7% of the variance in the HOOS and 78% of the variance in the Oxford Hip Score but no PA measures were returned. Conclusion-Activity levels in the male THA population lacking co-morbidities are clinically at par with age-matched peers and near minimum activity guidelines. Traditional PA measures were unrelated to disability measures.

Thesis (doctoral)--Ludwig-Maximilians-Universität zu München, 1979.

Thesis (doctoral)--Ludwig Maximilians-Universität zu München, 1978.

Thesis (Ph.D.)--York University, 2005. Graduate Programme in Sociology. / Typescript. Includes bibliographical references (leaves 221-253). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pNR11616

Total hip replacement in acute femoral neck fractures is done in salvage situations such as non-union and aseptic necrosis. Loosening of the prosthesis from the host bone has been recognised as a source of the most common post-operative complications. Therefore, continued follow up is necessary to identify early evidence of migration of the prosthesis. In current practice, clinicians assess loosening by visually inspecting a number of standard x-ray images of the patient's hip joint, taken over a period of time. This process is time-consuming and introduces inter-observer and intra-observer variability. The present thesis provides a new algorithm for computer-aided evaluation of prosthesis loosening in the form of an ???expert assistant???. / Computer-aided measurement of prosthesis migration involves finding a discrete mapping between features of the prosthesis model and features in the X-ray image. The orientation and the position of patient relative to the camera do not remain fixed in each radiograph taken over a long period. As a preliminary to this analysis, it is necessary to search for comparable radiographs in which the poses are similar. / This thesis introduces a robust geometrical matching algorithm to describe the pose of the prosthesis in a radiograph and the location of its key feature points relative to femur. An algorithm that uses the expectation maximisation (EM) approach has been designed and implemented to estimate the parameters of the rotation matrix and the translation vector for the 3D reference model of the prosthesis. This is achieved by matching selected control points on the reference model with corresponding set of control points extracted from X-ray image without the knowledge of their correspondence match. For matching purposes, feature points are extracted from X-ray images using novel and existing image processing techniques. Once they are located, the parameters of migration are measured. A Kalman filter-based bone edge detection algorithm is proposed and successfully implemented in this thesis. / Thesis (PhD)--University of South Australia, 2001.

Total hip replacement in acute femoral neck fractures is done in salvage situations such as non-union and aseptic necrosis. Loosening of the prosthesis from the host bone has been recognised as a source of the most common post-operative complications. Therefore, continued follow up is necessary to identify early evidence of migration of the prosthesis. In current practice, clinicians assess loosening by visually inspecting a number of standard x-ray images of the patient's hip joint, taken over a period of time. This process is time-consuming and introduces inter-observer and intra-observer variability. The present thesis provides a new algorithm for computer-aided evaluation of prosthesis loosening in the form of an ???expert assistant???. / Computer-aided measurement of prosthesis migration involves finding a discrete mapping between features of the prosthesis model and features in the X-ray image. The orientation and the position of patient relative to the camera do not remain fixed in each radiograph taken over a long period. As a preliminary to this analysis, it is necessary to search for comparable radiographs in which the poses are similar. / This thesis introduces a robust geometrical matching algorithm to describe the pose of the prosthesis in a radiograph and the location of its key feature points relative to femur. An algorithm that uses the expectation maximisation (EM) approach has been designed and implemented to estimate the parameters of the rotation matrix and the translation vector for the 3D reference model of the prosthesis. This is achieved by matching selected control points on the reference model with corresponding set of control points extracted from X-ray image without the knowledge of their correspondence match. For matching purposes, feature points are extracted from X-ray images using novel and existing image processing techniques. Once they are located, the parameters of migration are measured. A Kalman filter-based bone edge detection algorithm is proposed and successfully implemented in this thesis. / Thesis (PhD)--University of South Australia, 2001.

Hip simulators are designed to reproduce the forces and motion patterns of normal walking. In vivo demands on total hip replacements, however, are varied and often more severe than normal walking conditions. It is these severe conditions that often lead to implant failure. This is clinically based research aimed at understanding some of the more severe conditions in hips and the effect that these have on the performance of the total hip replacement. The polyethylene liner can act as a pump in an acetabular component, forcing fluid and wear particles through the holes to the retroacetabular bone causing osteolysis. Ten patients were studied at revision surgery. Pressures were measured in retroacetabular osteolytic lesions while performing pumping manouvers with the hip. Two laboratory experiments were then designed to study pumping mechanisms in vitro. In patients with contained osteolytic lesions, fluid pressure fluctuations could be measured in the lesion in association with the pumping action. Patients with uncontained osteolytic lesions showed no such pressure fluctuations. In the laboratory we identified 3 distinct mechanisms whereby fluid can be pumped from the hip joint to the retroacetabular bone. These pumping effects could be mitigated by improved implant design. Loading of the femoral head against the edge of the acetabular component produces dramatically increased contact pressures particularly in hard-on-hard bearings. In an analysis of 16 retrieved ceramic-on-ceramic bearings we were able to characterise the mechanism of edge loading based on the pattern of edge loading wear on the bearing surface. Finally in a radiographic study of patients with squeaking ceramic-on-ceramic hips. Squeaking was found to be associated with acetabular component malposition. It seems that edge loading or impingement may be an associated factor in these cases.

ABSTRACT WORDSMITH: EXAMINING THE ROLE HIP-HOP TEXTS PLAY IN VIEWING THE WORLD by Crystal LaVoulle Originally the voice of a silenced group of inner city Black males, hip-hop culture contains a historical road map that chronicles the experiences of its members. This study attempted to examine hip-hop through the stories of adults who incorporateaspects of hip-hop culture into their daily lives. Specifically, this study investigated, “How is hip-hop a critical element in the lives of poets, artists, and educators who are actively and intimately involved in its music and culture?” Additionally, this study will explore the following sub-questions: (1) What does it mean to be a member of the hip-hop community? (2) How does hip-hop inform the view of the world for participants in this study? This qualitative research study, framed by critical literacy, attempted to fill the void in the scholarship of hip-hop texts. Data collection included in-depth individual interviews, photo-elicited interviews and music-elicited interviews, a group interview, and cultural artifacts. Narrative inquiry and analysis served as both the process and product used to describe the participants’ lives as members of the hip-hop community. Narrative analysis allowed the construction of cipher-styled presentation of the data collected. Using participants’ lived experiences, their individual stories are molded into a concise narrative. This narrative, told by members of the hip-hop community, may provide a context for other researchers seeking to understand the influence of hip-hop on everyday people around the world.