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Pilot study on proximal femur strains during locomotion and fall-down scenario

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Abstract

The most common and severe type of fracture among the elderly is known as a proximal femur fracture. Aging-related bone loss is one of the major contributing factors to increased likelihood of bone fracture. Specific exercises can be used to strain bones and increase bone strength to counter the effects of bone loss. The flexible multibody simulation approach can be used as a non-invasive method for estimating bone strains caused by physical activity. This method was recently used to analyze the strain of locomotion in regard to human femur and tibia leg bones. The current study focuses on strain analysis of the femoral neck. The research test person was a clinically healthy 65-year old Caucasian male. The computed tomography was used to build a geometrically accurate finite element model of the femur with inhomogeneous material properties derived from the voxel data. The anthropometric data was used to model the musculoskeletal system of the test person. The multibody skeletal model was utilized to estimate loading on the femoral neck during walking, which represents a routine daily activity. The flexible multibody simulation results were compared to strains that occurred during a simulated fall onto the greater trochanter of the femur. The fall simulation was made entirely using finite element software. Results from the finite element analysis were compared with the previous study showing that the test person does not belong to the high-risk hip fracture group. Finally, the estimated strains gathered from the walking simulation were compared to the strain values from the simulated fall-down scenario.

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Authors and Affiliations

  1. Lappeenranta University of Technology, Skinnarilankatu 34, 53850, Lappeenranta, Finland

    Adam Kłodowski, Antti Valkeapää & Aki Mikkola

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  1. Adam Kłodowski
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  2. Antti Valkeapää
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Correspondence to Adam Kłodowski.

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Kłodowski, A., Valkeapää, A. & Mikkola, A. Pilot study on proximal femur strains during locomotion and fall-down scenario. Multibody Syst Dyn 28, 239–256 (2012). https://doi.org/10.1007/s11044-012-9312-0

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  • DOI: https://doi.org/10.1007/s11044-012-9312-0

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