Objective To investigate the biomechanical characteristics of hindfoot joint after ankle arthrodesis. Methods Based on the CT images of the right ankle of healthy adult male volunteers, a three-dimensional finite element model of the normal ankle was constructed. On this basis, the bony fusion after ankle arthrodesis was simulated. Five load cases of neutral, external rotation, internal rotation, dorsiflexion， and plantar flexion were used to analyze the model group before and after fusion, and to evaluate the changes of overall stiffness and the contact mechanical characteristics of subtalar joint and talonavicular joint before and after ankle arthrodesis. Results After ankle arthrodesis, the overall structural stiffness was significantly higher than that of the model before fusion. Except for neutral condition, the contact area of subtalar joint after fusion decreased, while the contact area of talonavicular joint increased. The contact stress of subtalar joint and talonavicular joint after fusion generally showed a downward trend under various working conditions. Conclusions The change of contact characteristics of adjacent joints after ankle arthrodesis may be the result of the change of bearing mode after the improvement of the overall structural stiffness of the foot, and its association with the degenerative changes of adjacent hindfoot joints needs to be confirmed by further research.
Lin Wenjie, Sun Xin, Huang Wenhua, Wei Bo, Lin Tao, Liang Zhenming, Zhong Huan, Zhang Xin, Ouyang Hanbin
. Biomechanical analysis of hindfoot joint after ankle arthrodesis[J]. Chinese Journal of Clinical Anatomy, 2023
, 41(2)
: 212
-217
.
DOI: 10.13418/j.issn.1001-165x.2023.2.16
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