The patella morphology in trochlear dysplasia : a comparative MRI study

BACKGROUND: Trochlear dysplasia is suspected to have a genetic basis and causes recurrent patellar instability due to insufficient anatomical geometry. Numerous studies about trochlear morphology and the optimal surgical treatment have been carried out, but no attention has been paid to the corresponding patellar morphology.----- ----- PURPOSE: The aim of this study was the evaluation of the patellar morphology in normal and trochlear dysplastic knees. ----- ----- STUDY DESIGN: Biometric analysis. ----- ----- METHODS: Twenty two patellae with underlying trochlear dysplasia (study group--SG) were compared with 22 matched knees with normal trochlear shape (control group--CG) on transverse and sagittal MRI slices. We compared transverse diameter, cartilaginous thickness, Wiberg-index and -angle, length and radius of lateral and medial facet, patellar shape and angle, retropatellar length, and type of trochlear dysplasia. For statistical analysis we used the Wilcoxon signed ranks test. ----- ----- RESULTS: The transverse and sagittal diameter, mean length of medial patellar facet, and mean cartilaginous and subchondral Wiberg-index showed statistical differences between the two groups. ----- ----- CONCLUSIONS: Although the insufficient trochlear depth and decreased lateral trochlear slope are responsible for patellofemoral instability, the patella shows morphological changes in trochlear dysplastic knees. Its overall size and the medial facet are smaller. Although the femoral sulcus angle is larger, the Wiberg-angle and -index are equal to the control group. This may indicate that the patellar morphology may not be a result of missing medial patellofemoral pressure in trochlear dysplastic knees, but a decreased medial patellofemoral traction. This seems to be caused by hypotrophic medial patellofemoral restraints in combination with an increased lateral patellar tilt, both resulting in a decreased tension onto the medial patella facet. Whether there is a genetic component to the patellar morphology remains open.

Integrating Responses to Homelessness: The Contribution of Participatory Action Research

In recent years Participatory Action Research (PAR) and other collaborative inquiry processes have been used in a wide variety of program and service contexts. Early childhood services, Indigenous services, youth drug and alcohol services, and education and vocational training support services have all been sites where PAR has been utilized. Action research is important as it helps improve policy and ensures that best practice and experience can be shared.

Identifying good re-engagement practice : case studies from Brisbane North and West Youth Connections action research

This report summarises the action research undertaken by the Brisbane North and West Youth Connections Consortium during 2010 and facilitated by staff from QUT. The Consortium consists of a lead agency which undertakes both program coordination and direct service delivery (Brisbane Youth Service) and four other agencies across the region who undertake direct service delivery. Funds for Youth Connections are provided by the Australian Government Department of Education, Employment and Workplace Relations. This report describes and analyses the participatory action research (PAR) undertaken in 2011, including eight case studies exploring questions seen as important to the re-engagement of young people in education and training.

Youth Homelessness and Early Intervention: Key Characteristics and Challenges

The key requirements for effective early intervention into youth homelessness are discussed. Young people are exposed to the risk of homelessness from a constellation of factors at the structural through to the individual level and early intervention has generally been conceptualized as part of a continuum of responses.

Developing the Practice of Early Intervention into Youth Homelessness

The Australian government has found that early intervention services related to youth homelessness expanded through the Reconnect program have been found to be quite effective and successful. The main things that a good early intervention practice requires are highlighted.

The Myer Centre Youth Protocol

The Myer Centre Youth Protocol outlines agreed guidelines and a grievance procedure in respect of young people's use of The Myer Centre, a shopping centre in central Brisbane. The Protocol was the first of its type in Australia and is a collaboration between the Brisbane City Council, the Myer Centre Management, and the Youth Affairs Network of Queensland. The development of the protocol was undertaken by Phil Crane and Greg Marston of Queensland University of Technology (QUT).

Brokering inclusion : the Myer Centre Youth Protocol

This report summarises the research undertaken that informed the Protocol, the process of development, and the first eighteen months of implementation. Particular chapters examine shopping centre use by young poeple, understanding conflict and opposition in the Centre, the Protocol development process, and the monitoring and review of the Protocol.

Participatory action research workbook

Provides a structure and a series of proformas for documenting a participatory action research (PAR) process. Includes tools for documenting PAR questions, documenting each element of the PAR cycle, and for writing a case study. Users can write into the word version of this workbook so it provides an ongoing record of the PAR process used.

Redland Youth Space development: evaluation report

This report provides an evaluation of the Capalaba Youth Space.The evaluation included elements of process and impact evaluation and used a participatory action research approach informed by engagement processes, focus groups, a community survey, interviews and secondary analysis of existing data.

Perioperative mortality after hemiarthroplasty related to fixation method : a study based on the Australian Orthopaedic Association National Joint Replacement Registry

Background and purpose: The appropriate fixation method for hemiarthroplasty of the hip as it relates to implant survivorship and patient mortality is a matter of ongoing debate. We examined the influence of fixation method on revision rate and mortality.----- ----- Methods: We analyzed approximately 25,000 hemiarthroplasty cases from the AOA National Joint Replacement Registry. Deaths at 1 day, 1 week, 1 month, and 1 year were compared for all patients and among subgroups based on implant type.----- ----- Results: Patients treated with cemented monoblock hemiarthroplasty had a 1.7-times higher day-1 mortality compared to uncemented monoblock components (p < 0.001). This finding was reversed by 1 week, 1 month, and 1 year after surgery (p < 0.001). Modular hemiarthroplasties did not reveal a difference in mortality between fixation methods at any time point.----- ----- Interpretation: This study shows lower (or similar) overall mortality with cemented hemiarthroplasty of the hip.

Waiver in the Court of Appeal

The vagaries inherent in the operation of special conditions in land sale contracts have commonly required judicial interpretation. A further illustration is provided by the recent decision of the Queensland Court of Appeal (Jerrard, Keane JJA and Philip McMurdo J) in Donaldson and Donaldson v Bexton and Bexton [2006] QCA 559.