Finite element analysis for treatment of osteoporotic femoral fracture with far cortical locking screw

doi:10.12307/2021.088

Abstract

Abstract: BACKGROUND: To overcome the shortcomings of high stress at the near side of the plate and high stiffness of standard locking screw, a new far cortical locking screw has been developed. The biomechanical character of osteoporotic femoral fracture with far cortical locking screw is still unclear.
OBJECTIVE: To investigate the biomechanical difference of osteoporotic femoral fracture with standard locking screw and far cortical locking screw by finite element analysis so as to provide reference for the clinical application of far cortical locking screw.
METHODS: One male old volunteer with osteoporosis was selected, and the two-dimensional CT data of osteoporotic femur were obtained. The finite element model of osteoporotic femoral fracture was established using the software of Mimics, Geomagic, and the finite element models of internal fixators were established using the software of UG. With three-dimensional finite element analysis, biomechanical characteristics of established model under axial compression, torsion and four point bending loading were analyzed using Abaqus software.
RESULTS AND CONCLUSION: (1) The stress of femur in far cortical locking group was smaller than those of in locking screw group, which decreased the risk of refracture. (2) The plate stress of far cortical locking group was less than that of locking screw group, and dispersed. The stress distribution on the screw in far cortical locking group was evenly distributed on all the far cortical locking screws, and the stress of the locking screws was evenly distributed throughout the screw, to avoid the breakage of internal fixation due to large local stress of plate and screw. (3) Far cortical locking group provided nearly parallel interfragmentary motion, and this motion promoted secondary fracture healing by callus formation. (4) The results imply that treatment of osteoporotic femoral fracture with far cortical locking screw can decrease the stress of femur and distribution of the stress on the internal fixation, and reduce the risk of reoperation due to refracture or internal fixation fracture. Far cortical locking screw can provide nearly parallel interfragmentary motion to promote callus formation.

Key words: bone, femur, osteoporosis, internal fixation, screw, nonunion, finite element analysis, biomechanics

CLC Number:

Zhu Yun, Chen Yu, Qiu Hao, Liu Dun, Jin Guorong, Chen Shimou, Weng Zheng. Finite element analysis for treatment of osteoporotic femoral fracture with far cortical locking screw[J]. Chinese Journal of Tissue Engineering Research, 2021, 25(24): 3832-3837.

Figures/Tables 4

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