Finite element analysis of a bone healing model: 1-year follow-up after internal fixation surgery for femoral fracture.
Finite element analysis was used to compare preoperative and postoperative stress distribution of a bone healing model of femur fracture, to identify whether broken ends of fractured bone would break or not after fixation dislodgement one year after intramedullary nailing. Method s: Using fast, personalized imaging, bone healing models of femur fracture were constructed based on data from multi-slice spiral computed tomography using Mimics, Geomagic Studio, and Abaqus software packages. The intramedullary pin was removed by Boolean operations before fixation was dislodged. Loads were applied on each model to simulate a person standing on one leg. The von Mises stress distribution, maximum stress, and its location was observed. Results : According to 10 kinds of display groups based on material assignment, the nodes of maximum and minimum von Mises stress were the same before and after dislodgement, and all nodes of maximum von Mises stress were outside the fracture line. The maximum von Mises stress node was situated at the bottom quarter of the femur. The von Mises stress distribution was identical before and after surgery. Conclusion : Fast, personalized model establishment can simulate fixation dislodgement before operation, and personalized finite element analysis was performed to successfully predict whether nail dislodgement would disrupt femur fracture or not.
Zhou Jiang-jun, MM, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Zhou
Z
Jiang-Jun
Zhao Min, MM, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Zhao
Z
Min
Yan Ya-bo, MD, Department of Orthopedic, Xijing Hospital, the Fourth Military Medical University, Xi'an 710032, Shannxi Province, China.
Yan
Y
Ya-Bo
Lei Wei, MD, Department of Orthopedic, Xijing Hospital, the Fourth Military Medical University, Xi'an 710032, Shannxi Province, China.
Lei
L
Wei
Lv Ren-fa, MM, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Lv
L
Ren-Fa
Zhu Zhi-yu, MB, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Zhu
Z
Zhi-Yu
Chen Rong-jian, MB, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Chen
C
Rong-Jian
Yu Wei-tao, MM, Department of Orthopedic, The 184th Hospital of Chinese PLA, Yingtan 335000, Jiangxi Province, China.
Yu
Y
Wei-Tao
Du Cheng-fei, MD, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.
Du
D
Cheng-Fei
Biomechanics; Bone healing model; Femur fracture; Finite element analysis; Intramedullary pin