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A Micromechanical Approach to the Fracture of Femoral Bone during Total Hip Arthroplasty: A Threshold for the Maximum Allowable Press-Fit
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Shoja, Hossein (Supervisor)
Abstract
The principle of micromechanics has been used to determine the maximum allowable press-fit for the hip stem during total hip arthroplasty. A 2D parametric solution has been presented. Bone and stem cross sections are modeled parametrically with respect to their geometry and mechanical properties. Surrounding soft tissue is also modeled and all the participating materials are considered as linear isotropic. Drucker-Prager fracture criterion is used to interpret the fracture phenomenon which is considered as both strain- and stress-state fracture. Considering presence of a thin layer of cancellous bone in the model caused a significant increase in results in comparison with previous numerical...
Experimental Study of the Effect of Bone Density on the Fixation Strength of Graft by Bashti Bone Plug Technique (BBPT) and Comparison with the RCI Interference Screws in Anterior Cruciate Ligament Reconstruction
, M.Sc. Thesis Sharif University of Technology ; Farahmand, Farzam (Supervisor) ; Chizari, Mahmoud (Supervisor)
Abstract
Bashti Bone Plug Technique (BBPT) is an implant-less method which can be used in an Anterior Cruciate Ligament (ACL) reconstructive surgery. The technique uses a core bone plug to fix the tendon graft into the bone tunnel. This study investigates the effect of the core bone density on fixation strength in BBPT method. A series of experimental test has been performed to examine the hypothesis of the study. Thirty fresh bovine digital extensor tendon used in three different groups. Sawbones blocks with densities of 160, 240 and 320 kg/m^3 used in substitute of the bone to model the effect of density on the strength of the fixation. The core bone plugs and tunnels created using a custom made...