Finite Element Analysis of Femoral Strains in Older Adults During Stair Ascent and Descent  

作　　者：Chen Deng Jason C.Gillette Timothy R.Derrick 

机构地区：[1]Division of Sport Biomechanics,School of Sport Science,Beijing Sport University,No.48,Xinxi Road,Beijing 100084,People’s Republic of China [2]Department of Kinesiology,Iowa State University,Ames,IA,USA

出　　处：《Journal of Science in Sport and Exercise》2022年第2期168-179,共12页体育运动科学（英文）

基　　金：was provided by Chinese Universities Scientific Fund(Grant No.2020063).

摘　　要：Purpose Understanding the femur load environment during daily activity is necessary for the understanding of risk of femoral pain,pain related falls,and femoral fractures,which could help the design of osteogenic exercises or the preventa-tive methods for older adults.Methods Using the finite element femur analysis,this study was to estimate the femoral strains at 9 cross-sections along the long axis of femur for stair ascent and descent(n=17;age:50-65 years).Motion analysis and inverse dynamics were com-bined with musculoskeletal modelling and optimization,then were used as input to a 3-D femur model to estimate femoral strains.Strains at the hip contact force peaks were calculated.Results The compressive and tensile strains during stair descent were greater than ascent for all or most cross-sections,especially for the proximal cross-sections of the femur:stair ascent produced−324.0±103.8 to−483.7±191.0μεcompressive strains and descent produced−608.8±288.4 to 1016.0±444.1με;stair ascent produced 336.2±105.4 to 391.8±136.9μεtensile strains and descent produced 546.9±252.8 to 741.7±333.6με.Conclusion Strains represent the material deformation effect on the bone due to the sum of all the bone external loads.Using bone strains could help future studies analyze load conditions in a more comprehensive way for other physical activities,which predicts the risk of stress fractures and tests if alternative methods(gait type change)could reduce stress and strain effectively.

关 键 词：Femoral cross-sections Finite element method Bone strains Stair ascent and descent Older adults 

分 类 号：G812.48[文化科学—体育学]