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RISFinite Element Analysis of a Three-Dimensional Open-Celled Model for Trabecular Bone
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Based on a regular array of cubic unit cells, each containing a body-centered spherical void, we created an idealized three-dimensional model for both subchondral trabecular bone and a class ...
Fracture Prediction for the Proximal Femur Using Finite Element Models: Part II—Nonlinear Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In Part I we reported the results of linear finite element models of the proximal femur generated using geometric and constitutive data collected with quantitative computed tomography. These ...
Prediction of Femoral Impact Forces in Falls on the Hip
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A major determinant of the risk of hip fracture in a fall from standing height is the force applied to the femur at impact. This force is determined by the impact velocity of the hip and ...
Fracture Prediction for the Proximal Femur Using Finite Element Models: Part I—Linear Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Over 90 percent of the more than 250,000 hip fractures that occur annually in the United States are the result of falls from standing height. Despite this, the stresses associated with femoral ...
Energy-Shunting Hip Padding System Attenuates Femoral Impact Force in a Simulated Fall
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Recent studies suggest that hip padding systems reduce the incidence of hip fractures during falls. However, no data exist on the force attenuating capacity of hip pads under realistic fall ...
Predicting the Impact Response of a Nonlinear Single-Degree-of-Freedom Shock-Absorbing System From the Measured Step Response
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We measured the step response of a surrogate human pelvis/impact pendulum system at force levels between 50 and 350 N. We then fit measured response curves with four different single-degree-of-freedom ...
Three-Dimensional Strain Fields in a Uniform Osteotomy Gap
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Stable internal fixation usually results in a unique histological healing pattern which involves direct cortical reconstruction and an absence of periosteal bridging callus. While it has been ...
Variation of Lumbar Spine Stiffness With Load
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Mechanical studies of the Functional Spinal Unit (FSU) in-vitro have shown that the slopes of the load-displacement curves increase with load. This nonlinearity implies that the stiffness of the ...
Monitoring Fracture Site Properties With External Fixation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An in-vitro system has been devised to monitor the properties of an idealized fracture site immobilized with a Hoffman-Vidal external fixator. A dial gage was used to measure the relative pin ...
Optimization Technique for the Calculation of In Vitro Three-Dimensional Vertebral Motion
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A method for the calculation of translations and Eulerian rotations of an orthogonal axis system with respect to a fixed reference is described with application to the measurement of position ...