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Numerical investigations of stress shielding in total hip prostheses
Aseptic loosening of the prosthesis is still a problem in artificial joint implants. The loosening can be caused by, among other factors, resorption of the bone surrounding the prosthesis owing to stress shielding. In order to find out the influence of the prosthesis type on post-operative stress shielding, a static finite element analysis of a femur provided with the conventional uncemented stem BICONTACT and of one with the femoral neck prosthesis SPIRON was carried out. Strain energy densities and maximal principal strain distributions were calculated and compared with the physiological situation. Here, stress shielding was demonstrated in both periprosthetic femora. To determine the areas of the stress shielding, the bone in each FE model was subdivided into three regions of interest (ROI): proximal, diaphyseal, and distal. The numerical computations show stress shielding in the proximal ROI of both periprosthetic femora. Diaphyseally, the femoral neck prosthesis SPIRON, in contrast to the conventional uncemented long-stem prosthesis BICONTACT, causes no decrease in the strain distribution and thus no stress shielding. Distally, no change in the load distribution of either periprosthetic femur could be found, compared with the physiological situation. © 2008 IMechE.
Numerical investigations of stress shielding in total hip prostheses
Aseptic loosening of the prosthesis is still a problem in artificial joint implants. The loosening can be caused by, among other factors, resorption of the bone surrounding the prosthesis owing to stress shielding. In order to find out the influence of the prosthesis type on post-operative stress shielding, a static finite element analysis of a femur provided with the conventional uncemented stem BICONTACT and of one with the femoral neck prosthesis SPIRON was carried out. Strain energy densities and maximal principal strain distributions were calculated and compared with the physiological situation. Here, stress shielding was demonstrated in both periprosthetic femora. To determine the areas of the stress shielding, the bone in each FE model was subdivided into three regions of interest (ROI): proximal, diaphyseal, and distal. The numerical computations show stress shielding in the proximal ROI of both periprosthetic femora. Diaphyseally, the femoral neck prosthesis SPIRON, in contrast to the conventional uncemented long-stem prosthesis BICONTACT, causes no decrease in the strain distribution and thus no stress shielding. Distally, no change in the load distribution of either periprosthetic femur could be found, compared with the physiological situation. © 2008 IMechE.
Numerical investigations of stress shielding in total hip prostheses
Behrens, Bernd-Arno (author) / Wirth, C.J. (author) / Windhagen, H. (author) / Nolte, I. (author) / Meyer-Lindenberg, Andrea (author) / Bouguecha, Anas (author)
2008-01-01
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 222 (2008), Nr. 5
Article (Journal)
Electronic Resource
English
Stress shielding , elasticity , Hip prostheses , weight bearing , Principal strain , Equipment Failure Analysis , hip arthroplasty , Finite element analysis , article , biological model , Bone , Arthroplasty , Human femora , Total hip arthroplasty , Strain energy , Strain energy density , Finite element method , equipment , human , Human femur , Shielding , femur , Maximal principal strain , Welds , Physiology , Replacement , Hip , pathophysiology , Strain , Prosthetics , mechanical stress
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