[Establishment of a three-dimensional finite element model and stress analysis of the talus during normal gait].
OBJECTIVE
To develop a three-dimensional (3D) finite element model of the human ankle with fine details and analyze the stress distribution on the talus during different gait phases.


METHODS
Mimics13.0 and Geomagic10.0 software were used for geometric reconstruction of the ankle based on the 3D CT data of the foot. The model was meshed and assigned with the material properties in Hypermesh10.0 software. The model was then imported to Abaqus6.9, and the stress condition of the talus during the 3 phases (heel-strike, midstance, push-off) of normal gait was simulated to calculate the stress distribution within the bone.


RESULTS
The three-dimensional finite element model of the ankle established consisted of 21 865 nodes and 73 440 elements. The stress distribution within the bone in 3 phases of normal gait differed significantly. The peak von Mises stress on the talus dome, from the heel-strike to push-off phases, was 3.0 MPa, 4.3 MPa and 4.8 MPa, as compared to 1.3 MPa, 1.9 MPa and 2.8 MPa on the talar neck, 2.8 MPa, 3.0 MPa, and 3.4 MPa on the talonavicular joint surface, and 2.2 MPa, 1.8 MPa and 1.5 MPa on the subtalar joint, respectively.


CONCLUSIONS
The finite element model of the talus shows a good response against the experimental data and can be used to simulate the biomechanic experiment of the talus.
Lu
Chang-huai
CH
Department of Orthopedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. lu.oxford@yahoo.com
Yu
Bin
B
Chen
Hui-qiang
HQ
Lin
Qing-rong
QR
D000328:Adult; D001696:Biomechanical Phenomena; D020342:Finite Element Analysis; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D012984:Software; D013314:Stress, Mechanical; D013628:Talus / Q000033:anatomy & histology / Q000502:physiology*