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

Wind interference on local loads on high rise buildings in a tandem arrangement

Most of the information used for codification of the local wind loads on buildings is based on model tests on isolated structures. The effects of the immediate surroundings which can be quite significant are rarely considered in any detail. To obtain a better understanding of the influence of wind interference on local loads, a wind tunnel study was performed on a series of two building configurations. The current paper presents some of the results of this experimental study; it discusses the local wind loads on a high-rise building in the presence of a building with similar dimensions at three locations in tandem arrangement at 0 degree wind angle. Initial results show significant effects on local loads on all building faces for both the mean as well as the fluctuating pressure distribution. In specific locations, e.g. on the front of both sides of the building, significant adverse effects were encountered in local loads, even in cases for which the influence on the overall loads is insignificant or even favorable

Special issue in honor of Lallit Anand

10.1016/j.ijplas.2010.06.001International Journal of Plasticity2681071-1072IJPL