TY - GEN
T1 - Computer assisted femoral augmentation - Modeling and experimental validation
AU - Basafa, Ehsan
AU - Murphy, Ryan J.
AU - Kutzer, Michael D.
AU - Otake, Yoshito
AU - Armand, Mehran
PY - 2013
Y1 - 2013
N2 - We report the results of planning and experimental validation of femoroplasty-augmentation of mechanical properties of the bone using polymethylmethacrylate (PMMA) bone cement injection-on osteoporotic femurs. For six pairs of osteoporotic femurs, finite element (FE) models were created using computed tomography (CT) scan data and an evolutionary method was used to optimize the cement pattern in one of the models from each pair. Using a particle method and the CT data, cement diffusion was modeled for several hypothetical augmentations and the one most closely matching the optimized pattern was chosen as the best plan. We used intra-operative navigation and a custom-designed injection device to deliver the cement into the bones precisely according to the plan. All femurs were then tested mechanically in a configuration simulating a fall to the side. Augmentation with this technique resulted in an increase in the yield load (28%) and yield energy (142%) compared to the control specimens, while only 9.8ml of cement was injected on average. Results support our hypothesis that significant improvements in the mechanical properties of osteoporotic femurs can be achieved by using minimal, and hence safe, amounts of PMMA bone cement.
AB - We report the results of planning and experimental validation of femoroplasty-augmentation of mechanical properties of the bone using polymethylmethacrylate (PMMA) bone cement injection-on osteoporotic femurs. For six pairs of osteoporotic femurs, finite element (FE) models were created using computed tomography (CT) scan data and an evolutionary method was used to optimize the cement pattern in one of the models from each pair. Using a particle method and the CT data, cement diffusion was modeled for several hypothetical augmentations and the one most closely matching the optimized pattern was chosen as the best plan. We used intra-operative navigation and a custom-designed injection device to deliver the cement into the bones precisely according to the plan. All femurs were then tested mechanically in a configuration simulating a fall to the side. Augmentation with this technique resulted in an increase in the yield load (28%) and yield energy (142%) compared to the control specimens, while only 9.8ml of cement was injected on average. Results support our hypothesis that significant improvements in the mechanical properties of osteoporotic femurs can be achieved by using minimal, and hence safe, amounts of PMMA bone cement.
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U2 - 10.1115/DETC2013-13636
DO - 10.1115/DETC2013-13636
M3 - Conference contribution
AN - SCOPUS:84899061997
SN - 9780791855911
T3 - Proceedings of the ASME Design Engineering Technical Conference
BT - 18th Design for Manufacturing and the Life Cycle Conference; 2013 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications
PB - American Society of Mechanical Engineers
T2 - ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2013
Y2 - 4 August 2013 through 7 August 2013
ER -