1. On the Failure Initiation in the Proximal Human Femur Under Simulated Sideways Fall
- Author
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William S. Enns-Bray, R.P. Widmer Soyka, O. Ariza, Ingmar Fleps, Halldór Pálsson, Seth Gilchrist, Hassan Bahaloo, Pierre Guy, Benedikt Helgason, Peter A. Cripton, and Stephen J. Ferguson
- Subjects
Male ,musculoskeletal diseases ,0301 basic medicine ,Finite Element Analysis ,Biomedical Engineering ,030209 endocrinology & metabolism ,Models, Biological ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Humans ,Femur ,Femoral neck ,Bone mineral ,Orthodontics ,Hip fracture ,Proximal femur ,Hip Fractures ,Femur Head ,Human femur ,medicine.disease ,030104 developmental biology ,medicine.anatomical_structure ,Cancellous Bone ,Fracture (geology) ,Female ,Cancellous bone ,Geology - Abstract
The limitations of areal bone mineral density measurements for identifying at-risk individuals have led to the development of alternative screening methods for hip fracture risk including the use of geometrical measurements from the proximal femur and subject specific finite element analysis (FEA) for predicting femoral strength, based on quantitative CT data (qCT). However, these methods need more development to gain widespread clinical applications. This study had three aims: To investigate whether proximal femur geometrical parameters correlate with obtained femur peak force during the impact testing; to examine whether or not failure of the proximal femur initiates in the cancellous (trabecular) bone; and finally, to examine whether or not surface fracture initiates in the places where holes perforate the cortex of the proximal femur. We found that cortical thickness around the trochanteric-fossa is significantly correlated to the peak force obtained from simulated sideways falling (R 2 = 0.69) more so than femoral neck cortical thickness (R 2 = 0.15). Dynamic macro level FE simulations predicted that fracture generally initiates in the cancellous bone compartments. Moreover, our micro level FEA results indicated that surface holes may be involved in primary failure events.
- Published
- 2017