Implants in the human proximal femur: A combined experimental-computational study
SCHOOL OF MECHANICAL ENGINEERING SEMINAR
Monday, November 30, 2020 at 14:00
Implants in the human proximal femur:
A combined experimental-computational study
Ph.D. student under the supervision of Prof. Zohar Yosibash
Hip replacement is a common orthopedic surgical procedure. Long-term survival of hip implants is of increasing relevance due to rising life expectancy. The biomechanical effect of strain shielding as a result of implant's presence may lead to bone resorption, thus increasing the risk for implant loosening and periprosthetic hip fractures. Studies on patient-specific finite element (FE) models based on quantitative computed tomography (QCT) showed that the mechanical response of intact femurs can be well predicted. The current study improves these methods and extends their application to femurs inserted with hip implants, focusing mainly on cemented implants.
To enable the use of FE in clinical practice for: femoral fracture risk assessment, pre-operative optimal implant selection and periprosthetic fracture risk prediction, QCT based FEAs must be proven reliable trough a thorough ex-vivo experimental procedure. A combined experimental-computational study on fresh frozen human femurs, in both intact and implanted states with different implants is presented, aiming at validating patient specific QCT based FE models.
The current study incorporates digital image correlation (DIC) full field measurements on human tissues with curved surfaces leading to new insights on the biomechanics of the femoral neck. This area’s response was misrepresented in previous studies.
The validated FE models were used to develop a systematic algorithm for strain shielding quantification. Different strain measures were examined suggesting the volumetric strain to be the most appropriate for strain shielding quantification, that may assist surgeons to choose the optimal patient specific implant.
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