The paper deals with finite element (FE) models of femoral stems aimed at supporting fatigue mechanical tests according to Medical Devices Standards. A basic model was created in agreement with the ISO7206-4:2010 requirements and used to investigate a certain number of varied configurations: the abduction and the flexion angle were varied in the range 2° 15° and 2° 13° respectively, and the constraint level in the range (3080)mm. Once the most critical configuration had been identified, femur-like FE models were created to investigate it in a context closer and closer to the in-vivo scenario: the models, in fact, were based on a femur-like fixture, and on various materials to simulate cement and cancellous bone. Both Titanium and Co-Cr-Mo alloys were used for the stem. For both alloys the highest stresses were found in correspondence with a 80mmconstraint and a more soft cancellous bone; higher risky deflection was estimated for theTitanium stem. The great potential of FE methodology and analysis is here commented, as a valid support to experimental tests. © 2012 Taylor & Francis Group.
Hip prostheses computational modeling: Mechanical behavior of a femoral stem associated with different constraint materials and configurations / Andreaus, Ugo; I., Campioni; A., Ventura; C., Giacomozzi. - ELETTRONICO. - 1:(2012), pp. 277-280. (Intervento presentato al convegno 3rd International Symposium on Computational Modelling of Objects Represented in Images: Fundamentals, Methods and Applications, CompIMAGE 2012 tenutosi a Rome nel 5 September 2012 through 7 September 2012).
Hip prostheses computational modeling: Mechanical behavior of a femoral stem associated with different constraint materials and configurations
ANDREAUS, Ugo;
2012
Abstract
The paper deals with finite element (FE) models of femoral stems aimed at supporting fatigue mechanical tests according to Medical Devices Standards. A basic model was created in agreement with the ISO7206-4:2010 requirements and used to investigate a certain number of varied configurations: the abduction and the flexion angle were varied in the range 2° 15° and 2° 13° respectively, and the constraint level in the range (3080)mm. Once the most critical configuration had been identified, femur-like FE models were created to investigate it in a context closer and closer to the in-vivo scenario: the models, in fact, were based on a femur-like fixture, and on various materials to simulate cement and cancellous bone. Both Titanium and Co-Cr-Mo alloys were used for the stem. For both alloys the highest stresses were found in correspondence with a 80mmconstraint and a more soft cancellous bone; higher risky deflection was estimated for theTitanium stem. The great potential of FE methodology and analysis is here commented, as a valid support to experimental tests. © 2012 Taylor & Francis Group.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.