Correction to: Cluster identification, selection, and description in Cluster randomized crossover trials: the PREP-IT trials

An amendment to this paper has been published and can be accessed via the original article

Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (fo

Placement Test System 4.0

The Placement Test System, Version 4.0 (PTS) allows University of Scranton academic departments to manage, score, and report on placement tests administered to incoming freshmen. PTS is capable of handling tests administered offline (via optically scanned, multiple-choice answer sheets) or online (via the system's web-enabled testing interface). PTS provides departments with automated scoring, reporting, class enrollment recommendations, and areas requiring improvement for each student. Because of the system's web-centric architecture, users can access PTS from anywhere via a web browser. The system was implemented in the PHP scripting language, making use of the Plankton Web Application Framework [3] and the DBA Framework