Background: Presentation of proximal tibia stress fracture is not infrequent among elderly patients due to their poorbone stock. Optimal management of patients with severe gonarthrosis of the knee and concurrent tibial stress fracture isnot known yet. In this study we report the outcome of primary total knee arthroplasty (TKA) using stemmed componentsin elderly patients.Methods: Between 2009 an...

Retrograde metamorphism (mineral hydration, carbonation and oxidation) is important in controlling the composition and rheology of the Earth’s crust and upper mantle, particularly along tectonic plate margins, and in proposed mechanisms for geothermal power generation and engineered, geological carbon storage. Retrograde processes can lead to an increase in solid mass and volume, or can be redu...

In this paper, conceptual models are presented to identify the effects of solid deformation on the changes in rock permeabilities for (a) fractured media, (b) intact media, and (c) fractured porous media subjected to external loads, all in steady state conditions. Finite element schemes are then developed with embedded correlations between induced strain and modified permeability to simulate th...

Dr. Hani Aziz Ameen* Received on :17/8/2009 Accepted on:7/1/2010 Abstract Shaft misalignment is considered as one of the common repeated problems in most rotating machineries , which leads to generate vibrations and extra dynamic loads on transmitting gears teeth, also leads to nonuniformity in distribution of applied load along the meshing tooth face by being concentrated on one side of tooth ...

BACKGROUND The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS A three-dimensional (3D) virtual mandible was rec...

Hydraulic fracturing technology is usually used to stimulate tight gas reservoirs for increasing gas production. The stimulated volume depends in part on the pre-existing natural fractures in a reservoir. The mechanisms influencing the interaction between hydraulic fractures and natural fractures have to be well understood in order to achieve a successful application of hydraulic fracturing. In...

The Pauwels Classification of femoral neck fractures, initially published in 1935, is used world-wide. Unfortunately, modern textbooks give varying angle and anatomic specifications between the classified fracture grades. This inconsistency is perpetuated in the literature, so that it is difficult to compare conclusions made by different authors. Pauwels himself left room for interpretation. He...

Abstract Earthquake stress drop Δ σ is related to fault slip via , where μ D and L c denote shear modulus, average slip, dimension. C controlled by the system geometry, characterizes effective stiffness of system, commonly assumed be a constant near 1. We use 3D elastostatic models systematically investigate how burial depth, dip angle, direction. find that decreases with smaller depth value fo...