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Biological Hip Joint Prostheses and Biomechanical Behavior of Implanted Femur Health Articles | May 31, 2017

Biofidel femur Finite Element Models have been developed using specific combination of Computer Tomography segmentation and solid modeling software tools able to represent bone physiology and structural behavior. These biofidel Finite Element Models (FEM) is used to evaluate the modification of the physiological stress distribution in a prosthesized femur, and to assess new design criteria for the development of biomimetic hybrid biological hip prostheses.


Introduction

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A highly interdisciplinary research group has been involved in the study of bone as a living material. The principal efforts have been devoted to mimic the bone characteristics and process of its formations and behavior under physiological loading (Apicella et al Cheap Chase Edmonds Jersey , 2010-2011, 2015; Gramanzini et al, 2016; Kummer, 1986; Perillo et al, 2010; Sorrentino et al, 2009 Cheap Mason Cole Jersey , 2007).


Advanced academic studies on biomechanics and biomimetic of implanted bones resulted from these investigations. This work project identifies a number of design criteria to foster their potential to enable new medical therapies contributing to customized health care, and to create and improve the technological basis for innovative prostheses design.


The human femur is characterized by a specific internal structure (Oh and Harris, 1976; Gottesman and Hashin, 1980) that imparts to the bone a high capacity to withstand external stresses while optimizing its mass distribution and morphology (Ashman et al., 1984; Dalstyra et al., 1993). However Cheap Christian Kirk Jersey , physiological bone mass loss progressively occurs at older age, reducing the its toughness and capability to dissipate the energy transmitted by external shock event, and this feature is the cause of most of the elder people pertrochanteric fractures along the plane indicated in figure 1.


Aversa et al (2016) have successfully modeled this behavior. Pertrochanteric fractures need hip joint prosthesis application (Ashman and Rho, 1988, Burnstein et al., 1976 Cheap Patrick Peterson Jersey , Carter and Hayes, 1977). The modification of the biomechanical behavior of aged or implanted bones can be correctly predicted using our previously developed biofidel Finite Element Modeling (FEM) (Apicella et al 2010, Aversa et al, 2009).


Nonetheless, total hip replacements performed on patients younger than 65, and hence with a necessary longer expected durability of the orthopedic implant Cheap Larry Fitzgerald Jersey , cannot endure for more than 15 years. Nevertheless, this clinical scenario has been changing now. Several health care technological developments increased the life expectations. Moreover, the prognosis for physical trauma due to sports, improper and excessive exercise practice, or road crashes have been ameliorated. New design more long lasting and biomechanically compatible prostheses are then needed.


The orthopedic prostheses used today are made of metal alloys, plastics and ceramics materials with well defined properties and characteristics.


In particular Cheap Chandler Jones Jersey , due to their high biocompatibility and high mechanical strength, the metal alloys commonly used are based on Titanium or Cobalt Chrome and they represent almost all of the prosthetic components that are in direct contact with the human bone since they can provide a good osteo-integration with the bone components.


Implant failures are principally due to biomechanical incompatibility between the prosthesis and the bone, namely, the inadequate strength or mismatching of the rigidities between the bone and implant causes arise of discontinuities in the stress and strains distribution in the bone with respect to the biologically one.


The current implant materials (metal and ceramic), which are more stiffer than bone, strongly alters the physiological bone stress distribution and prevents the needed stress being transferred to adjacent bone (Apicella et al Cheap David Johnson Jersey , 2010, 2011, 2015), resulting in bone reabsorption near the implant and, thus, increasing the risk of implant loosening.


In order to predict the structural alterations induced by the modification of the morphological and mechanical characteristic s implant (Apicella et al 2010, Gramanzini et al 2016, Perillo et al 2010, Sorrentino et al 2009 and 2007).


In the present work a femur FEM model, which has been developed in a previous work to correctly represent structural behavior of the femur head (Aversa et al. Cheap Hakeem Butler Jersey , 2016) has been analyzed for the stress and strains distribution over the entire bone stem and head, and it has been modified to accou. Cheap New Jerseys Cheap NBA Jerseys From China Cheap Wholesale College Jerseys Cheap Adidas NHL Jerseys Cheap Nike NFL Jerseys Cheap Soccer Jerseys From China Cheap New NHL Jerseys Cheap Football Jerseys China Wholesale Jerseys Wholesale Jerseys China