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The Design of Femur Neck Screws System and Biomechanical Study in Fixing Femoral Neck Fracture in Children

Author: HuangZuoHuai
Tutor: LiaoZuo
School: Nanhua University
Course: Orthopedic Surgery
Keywords: Child Femoral neck Fracture Instrument Internal fixation Biomechanics
CLC: R318.01
Type: Master's thesis
Year: 2008
Downloads: 27
Quote: 0
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Abstract


Objective: To measure the 5-7 year-old children the anatomy of the proximal femur parameters, observe the morphological characteristics; based on the development of a femoral neck fracture screw system applied to children; biomechanical testing methods through comparative analysis , evaluate the biomechanical performance of children fixed femoral neck fractures of the femoral neck screw system. Method: 1. Specimens measuring measuring 35 parameters of the anatomy of the proximal femur in Chinese children, and comparative analysis of specimens results and imaging results. Children femoral neck screw system developed based on the parameters of the anatomy of the proximal femur in children as well as morphological characteristics, designed for children femoral neck fracture screw system. 3 children femoral neck screw system fixation for femoral neck fracture biomechanical study using a paired design, six pairs femur specimens were randomly divided into two groups, respectively, axial compression test, torsion test. Determination of torsional stiffness, axial compression stiffness indicators. And Kirschner comparing. Results: 1 large sample specimens measuring results a: rotor spacing 21.84 ± 3.96mm; b: head and neck axis length 65.39 ± 14.24mm; c: femoral neck minimum top neck 24.36 ± 4.19mm; d: M point to the femoral neck minimum up and down the neck distance of 35.80 ± 8.81mm; e: neck-shaft angle of 141.51 ± 6.70 °; f: M point to the epiphyseal plate distance of 54.74 ± 11.84mm2. Children femoral neck screw system developed by the Institute of Design Children femoral neck screw, standard AO improved from cancellous bone screw, but the front end is smooth, cutting-edge design into a cone shape, is theoretically possible to avoid damage to the epiphyseal plate in children. Three screws in the proximal femur inverted triangular distribution, the formation of the three-dimensional fixed space, able to achieve stable fixation of fractures. 3 children femoral neck screw system femoral neck fracture biomechanics axial compression stiffness of the experimental group the 190.74 ± 20.88N/mm, control group to 138.95 ± 15.19N/mm, both statistical analysis of differences were significant ( P <0.05); twisting moment of maximum 3Nm, the torsional rigidity of the experimental group was 0.18 ± 0.045Nm/degree, the torsional stiffness of the control group, 0.12 ± 0.036Nm/degree, both compared to the differences statistically significant significance (P <0.05). The experimental results show that the stress resistance and torsional ability of the children in this study design femoral neck screws significantly stronger than Kirschner. Conclusions: The systematic study. Ages of 5-7 years old children is the study of the anatomy of the proximal femur in children characteristics, enrich the content of the anatomy, the for children femoral neck screw system developed to provide the anatomical basis. Children femoral neck screw system theoretically meet children proximal femur anatomical features new fixation devices to meet the needs of children femoral neck fracture. 3 children femoral neck screw system fixed femoral neck fractures has good biomechanical properties, may be ideal for the treatment of children with femoral neck fracture fixation devices.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues > Biomechanics
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