An in vitro and finite element study of load redistribution in the midfoot  

作　　者：NIU Wen Xin TANG Ting Ting ZHANG Ming JIANG Cheng Hua FAN Yu Bo 

机构地区：[1]Tongji Hospital, Tongji University School of Medicine [2]Interdisciplinary Division of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University [3]Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University [4]Shanghai Key Laboratory of Orthopaedic Implants [5]Department of Disaster and Emergency Medicine, Eastern Hospital, Tongji University School of Medicine

出　　处：《Science China(Life Sciences)》2014年第12期1191-1196,共6页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China(11302154,11272273);China Postdoctoral Science Foundation(2013M530211);Opening Project of Shanghai Key Laboratory of Orthopaedic Implants(KFKT2013002);Fundamental Research Funds for the Central Universities

摘　　要：A good knowledge of midfoot biomechanics is important in understanding the biomechanics of the entire foot,but it has never been investigated thoroughly in the literature.This study carried out in vitro experiments and finite element analysis to investigate the midfoot biomechanics.A foot-ankle finite element model simulating the mid-stance phase of the normal gait was developed and the model validated in in vitro experimental tests.Experiments used seven in vitro samples of fresh human cadavers.The simulation found that the first principal stress peaks of all midfoot bones occurred at the navicular bone and that the tensile force of the spring ligament was greater than that of any other ligament.The experiments showed that the longitudinal strain acting on the medial cuneiform bone was-26.2±10.8μ-strain,and the navicular strain was-240.0±169.1μ-strain along the longitudinal direction and 65.1±25.8μ-strain along the transverse direction.The anatomical position and the spring ligament both result in higher shear stress in the navicular bone.The load from the ankle joint to five branches of the forefoot is redistributed among the cuneiforms and cuboid bones.Further studies on the mechanism of loading redistribution will be helpful in understanding the biomechanics of the entire foot.A good knowledge of midfoot biomechanics is important in understanding the biomechanics of the entire foot,but it has never been investigated thoroughly in the literature.This study carried out in vitro experiments and finite element analysis to investigate the midfoot biomechanics.A foot-ankle finite element model simulating the mid-stance phase of the normal gait was developed and the model validated in in vitro experimental tests.Experiments used seven in vitro samples of fresh human cadavers.The simulation found that the first principal stress peaks of all midfoot bones occurred at the navicular bone and that the tensile force of the spring ligament was greater than that of any other ligament.The experiments showed that the longitudinal strain acting on the medial cuneiform bone was-26.2±10.8μ-strain,and the navicular strain was-240.0±169.1μ-strain along the longitudinal direction and 65.1±25.8μ-strain along the transverse direction.The anatomical position and the spring ligament both result in higher shear stress in the navicular bone.The load from the ankle joint to five branches of the forefoot is redistributed among the cuneiforms and cuboid bones.Further studies on the mechanism of loading redistribution will be helpful in understanding the biomechanics of the entire foot.

关 键 词：finite element analysis foot arch BIOMECHANICS cadaveric experiment MIDFOOT 

分 类 号：R687.3[医药卫生—骨科学]