Management of proximal humerus fractures with hemiarthroplasty has been shown to yield unpredictable and inconsistent outcomes. Risk factors for clinical failure following hemiarthroplasty include postoperative tuberosity failure, advanced age, female sex, osteoporosis, and inability or unwillingness to participate in the extensive rehabilitation required. In this difficult-to-manage injury, re...

Three-dimensional (3D) limit analysis of stability of slopes is presented. Such analyses are not common because of the difficulties in constructing three-dimensional mechanisms of failure in frictional soils. While examples of 3D translational failure patterns are known, no admissible rotational mechanisms for frictional soils have been described in the literature. A class of admissible rotatio...

The seismic failure behavior of railroad ballasts in response to earthquakes was analyzed using Discontinuous Deformation Analysis.Several sinusoidal waves with different frequencies and accelerations were inputted into the discontinuous numerical model of a railroad ballast ,which consists of an assemblage of polygonal crushed stones,rails,sleepers and a roadbed .The dependencies of railroad f...

The purpose of this study was to assess bone healing and complication rate following subtrochanteric rotational osteotomy fixed with a 4.5/5.0 Locking Compression Plate (LCP, Synthes) for reduced femoral antetorsion with early full weight bearing. The effects of the osteotomy on the range of internal rotation of the hip and complaints due to reduced antetorsion were also recorded. Between July ...

In this work we present numerical simulations of continuous flow left ventricle assist device implantation with the aim of comparing difference in flow rates and pressure patterns depending on the location of the anastomosis and the rotational speed of the device. Despite the fact that the descending aorta anastomosis approach is less invasive, since it does not require a sternotomy and a cardi...

AIM To test in vitro the mechanical resistance, rotational misfit and failure mode of three original implant-abutment connections and to compare them to two connections between non-original abutments connected to one of the original implants. MATERIAL AND METHODS Three different implants with small diameters (3.3 mm for Straumann Roxolid, 3.5 mm for Nobel Biocare Replace and Astra Tech Osseos...

Submitted January 10, 2015; revision received February 15, 2015; accepted February 24, 2015. “Little league shoulder” is caused by repeated overhead throwing in athletes between the ages of 11 and 14 years during peak proximal physis growth.1,2 The rotational torque during maximum external rotation when throwing overhead seems to be the primary cause of growth plate failure.1-3 (doi:10.7556/jao...