Finite element analysis of the effect of sagittal angle on ankle joint stability in posterior malleolus fracture: A cohort study
Finite element analysis of the effect of sagittal angle on ankle joint stability in posterior malleolus fracture: A cohort study
复制标题
DOI：
10.1016/j.ijsu.2019.08.022
复制
发表时间：
2019-10-01
影响因子：
15.3
通讯作者：
Tan, Jun
中科院分区：
文献类型：
--
作者：
Guan, Ming;Zhao, Jing;Tan, Jun
目的：目的：建立不同矢状角的后外踝斜型骨折的三维有限元模型，探讨矢状角对踝关节稳定性的影响。建立了正常踝关节的有限元模型，并验证了其可靠性。建立5个不同矢状角的后踝骨折模型。进行了有限元分析（FEA），以模拟中性位置的垂直载荷条件，总重量为600 N。结果：（1）正常踝关节模型的接触面积为483.55mm ~ 2，最大接触应力为3.793MPa。(2)矢状角（SA）与接触面积（CA）呈正相关（r = 0.925，P < 0.05）。回归方程为CA = 316.755 + 1.749*SA。矢状角与最大接触应力呈负相关（r =-0.988，P < 0.01）。回归方程为MCS = 5.214-0.018*SA。骨折矢状角与相对位移呈负相关（r =-0.950，P < 0.05）。回归方程为RD = 1.388-0.009*SA。结论：骨折矢状角越大，踝关节越稳定。骨折矢状角可作为反映后踝骨折踝关节稳定性的一个相对指标。
Objective: Aim of this study was to establish three-dimensional finite element model of the posterolateral-oblique type of posterior malleolus fracture with different sagittal angle and to explore the effect of sagittal angle on ankle joint stability.Methods: CT data of ankle were collected from a normal male volunteer. Established finite element model of the normal ankle and verified its reliability. Five posterior malleolus fracture models with different sagittal angles were established. Finite element analysis(FEA) was carried out to simulate the conditions of vertical loading in neutral position with a total weight of 600 N. Recorded the data and did statistical analyses.Results: (1) The contact area was 483.55 mm2 and the maximum contact stress was 3.793 MPa in the model of the normal ankle joint. (2) There was a positive correlation between the sagittal angle(SA) and the contact area (CA)(r = 0.925, P < 0.05). Regression equation was CA = 316.755 + 1.749*SA. The correlation between the sagittal angle and the maximum contact stress(MCS) was negative (r = -0.988, P < 0.01). Regression equation was MCS = 5.214-0.018*SA. There was a negative correlation between the sagittal angle of fracture and relative displacement(RD)(r = -0.950, P < 0.05). Regression equation was RD = 1.388-0.009*SA.Conclusion: The greater the sagittal angle of fracture was, The more stable the ankle joint was. The sagittal angle of fracture could be used as a relative index to reflect ankle stability for posterior malleolus fracture.