Finite element analysis of different internal fixation methods for Delbet II type femoral neck fracture in children

doi:10.12307/2023.381

Abstract

Abstract: BACKGROUND: The rate of femoral head necrosis is high after Delbet type II femoral neck fractures in children. Finite element method has been widely used to study the stability of femoral neck fractures in adults after internal fixation, but there are few related analyses of femoral neck fractures in children.
OBJECTIVE: To study the biomechanical properties of three different internal fixation methods in the treatment of Delbet II type femoral neck fracture in children.
METHODS: A normal 8-year-old child volunteer was selected as the research subject. CT scanning of the proximal femur of children was performed, and the image data were imported into Mimics 17.0. Three kinds of finite element models, cannulated screw model (CS model), cannulated screw and Kirschner wire model (CS+K model) and locking plate model (LP model) were established in Geomagic 14.0, Cero 3.0 and HyperWorks 13.0 to observe the internal fixation stress, epiphyseal stress and relative displacement of fracture end in the three models.
RESULTS AND CONCLUSION: (1) The stress in the fracture end and femoral head of CS+K model was significantly higher than that of CS model and LP model (P < 0.001). The femoral stress of LP model was significantly higher than that of CS+K model and CS model (P < 0.001). (2) The relative displacement of CS model was significantly greater than that of CS+K model and LP model (P < 0.001). (3) The mean stress of epiphyseal plate in LP model was significantly higher than that in CS+K model and CS model (P < 0.001). (4) It is concluded that cannulated screw combined with Kirschner wire fixation in the treatment of Delbet II type femoral neck fracture is more conducive to the stability of fracture, can reduce epiphyseal stress, and effectively reduce the incidence of femoral neck shortening and hip varus.

Key words: femoral neck fracture, children, internal fixation, finite element, digital orthopaedics, biomechanics

CLC Number:

Yin Wei, Ouyang Zhen, Zhou Juan, Yang Binhui, Wei Yongkun. Finite element analysis of different internal fixation methods for Delbet II type femoral neck fracture in children[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(22): 3476-3480.

Figures/Tables 4

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