Different fixations for intertrochanteric fracture affect proximal femur stress: a finite element analysis

doi:10.3969/j.issn.2095-4344.2016.44.009

Abstract

Abstract:

BACKGROUND: The mechanical characteristics of intramedullary and intramedullary fixations for treating intertrochanteric fracture were hot research of finite element, but there was few comparative research on tension side and pressure side of proximal femur. In our study, we found that the distribution of the stress zone was important indication to researches on intertrochanteric fracture and internal fixation design.

OBJECTIVE: To explore the effects of intramedullary and extramedullary fixations for treating intertrochanteric fracture on pressure side and tensile side of proximal femur.

METHODS: CT scan and Mimics modeling of volunteer’s femur were conducted, and the model Evans type I intertrochanteric fracture was constructed and treated with proximal femoral nail antirotation and dynamic hip screw respectively. The stress condition of proximal femur in weight status was simulated. The Abaqus 6.13 was used for finite element analysis, and the tension side and pressure side of proximal femur in both fixations were also analyzed.

RESULTS AND CONCLUSION: (1) The stresses of compressive side and tensile side in proximal femoral nail antirotation group were both less than that in dynamic hip screw group. The stress of proximal femur in proximal femoral nail antirotation group was more similar to that in physiological status. (2) These findings verified that for treating intertrochanteric fracture, intramedullary fixation exerted better mechanical behavior than extramedullary fixation. The protection of compressive side and tensile side of proximal femur had achieved by intramedullary fixation.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Femur, Fractures, Bone, Stress, Mechanical, Finite Element Analysis, Tissue Engineering

CLC Number:

R318

Jiang Zi-wei, Huang Feng, Zheng Xiao-hui, Hu Qun-sheng, Pang Zhi-hui, Zhou Guang-quan, Li Yue . Different fixations for intertrochanteric fracture affect proximal femur stress: a finite element analysis[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(44): 6599-6605.

Figures/Tables 1

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