PFNA和InterTan固定A3型股骨转子间骨折的有限元分析
发布时间：2018-12-05 22:46
【摘要】：目的:通过有限元分析比较目前治疗股骨转子间A3型骨折常用的两种内固定系统:PFNA和Inter Tan的生物力学稳定性,为临床应用提供理论依据。方法:分别建立AO3.1、3.2、3.3型股骨转子间骨折及两种内固定的三维有限元模型,按骨科要求予以固定,研究不同模型股骨、内固定的应力分布,比较股骨及内固定模型不同区域的应力峰值,分析生物力学稳定性。结果:AO3.1型骨折PFNA组股骨侧应力集中在股骨近端外侧,Inter Tan组股骨侧应力集中在股骨近端内侧;AO3.2型骨折两种内固定系统股骨侧各个区域均无明显应力集中;AO3.3型骨折PFNA组股骨侧应力集中在股骨近端内侧及内固定远端内侧,Inter Tan组股骨侧无明显应力集中。六种模型内固定远端应力均集中在内侧,其中PFNA组应力大于Inter Tan组;内固定远端内外侧应力差值PFNA组大于Inter Tan组;除PFNA固定AO3.3型骨折外,其余五种模型应力峰值均位于头钉与主钉交叉处内侧。结论:AO3.1和AO3.3型骨折中,InterTan比PFNA具有更好的稳定性,AO3.2型骨折中,二者稳定性无明显差异;运用Inter Tan固定A3型股骨转子间骨折时应力分布较PFNA更加合理。
[Abstract]:Objective: to compare the biomechanical stability of two kinds of internal fixation systems: PFNA and Inter Tan, which are commonly used in the treatment of intertrochanteric A3 fracture by finite element analysis, so as to provide theoretical basis for clinical application. Methods: three dimensional finite element models of AO3.1,3.2,3.3 type intertrochanteric fracture and two kinds of internal fixation were established and fixed according to the requirements of orthopedic department. The stress distribution of different models of femur and internal fixation were studied. Stress peaks in different regions of femur and internal fixation model were compared and biomechanical stability was analyzed. Results: the stress concentration of femoral side in PFNA group of AO3.1 type fracture was concentrated on the proximal side of femur in, Inter Tan group, and there was no obvious stress concentration in each region of femur side in both internal fixation system of AO3.2 type fracture. There was no significant stress concentration on the femoral side in the PFNA group with AO3.3 type fracture and the proximal femur and the distal medial femur fixation in the, Inter Tan group. The distal stress of the six internal fixation models was concentrated on the medial side, in which the stress in PFNA group was greater than that in Inter Tan group, and the stress difference between PFNA group and Inter Tan group was higher than that in Inter Tan group. With the exception of PFNA fixation of AO3.3 type fractures, the stress peaks of the other five models were located on the medial side of the cross between the head nail and the main nail. Conclusion: InterTan has better stability than PFNA in AO3.1 and AO3.3 fractures, but there is no significant difference between them in AO3.2 type fractures, and the stress distribution of A3 femoral intertrochanteric fractures fixed with Inter Tan is more reasonable than PFNA.
【学位授予单位】：山西医科大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R687.3
本文编号：2365581
[Abstract]:Objective: to compare the biomechanical stability of two kinds of internal fixation systems: PFNA and Inter Tan, which are commonly used in the treatment of intertrochanteric A3 fracture by finite element analysis, so as to provide theoretical basis for clinical application. Methods: three dimensional finite element models of AO3.1,3.2,3.3 type intertrochanteric fracture and two kinds of internal fixation were established and fixed according to the requirements of orthopedic department. The stress distribution of different models of femur and internal fixation were studied. Stress peaks in different regions of femur and internal fixation model were compared and biomechanical stability was analyzed. Results: the stress concentration of femoral side in PFNA group of AO3.1 type fracture was concentrated on the proximal side of femur in, Inter Tan group, and there was no obvious stress concentration in each region of femur side in both internal fixation system of AO3.2 type fracture. There was no significant stress concentration on the femoral side in the PFNA group with AO3.3 type fracture and the proximal femur and the distal medial femur fixation in the, Inter Tan group. The distal stress of the six internal fixation models was concentrated on the medial side, in which the stress in PFNA group was greater than that in Inter Tan group, and the stress difference between PFNA group and Inter Tan group was higher than that in Inter Tan group. With the exception of PFNA fixation of AO3.3 type fractures, the stress peaks of the other five models were located on the medial side of the cross between the head nail and the main nail. Conclusion: InterTan has better stability than PFNA in AO3.1 and AO3.3 fractures, but there is no significant difference between them in AO3.2 type fractures, and the stress distribution of A3 femoral intertrochanteric fractures fixed with Inter Tan is more reasonable than PFNA.
【学位授予单位】：山西医科大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R687.3
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