Two different fixation methods for vertically unstable femoral neck fractures: mechanical study and finite element analysis
10.3760/cma.j.cn115530-20241018-00405
- VernacularTitle:垂直不稳定型股骨颈骨折的两种固定方式的力学研究及有限元分析
- Author:
Weijun AN
1
;
Junhui YU
;
Aili QU
;
Haixia ZHANG
;
Peng YE
;
Weiwei GUO
;
Shaodong QIU
Author Information
1. 宁夏医科大学总医院创伤骨科，宁夏 750004
- Publication Type:Journal Article
- Keywords:
Femoral neck fracture;
Fracture fixation;
Shear strength;
Finite element analysis
- From:
Chinese Journal of Orthopaedic Trauma
2025;27(5):444-450
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the changes in fracture displacement under different vertical loadings between the 2 different internal fixation modalities for vertically unstable femoral neck fractures of Pauwels type Ⅲ by a mechanical study and a finite element analysis.Methods:Twelve biomimic bones were transversely dissected from 10 cm below the lesser trochanter of the femur to create femoral neck fracture models with a Pauwels angle of 70° using a swing saw. The models were equally divided into 2 groups ( n=6): group A was fixed with 3 cannulated screws after fracture reduction (scheme A), and group B with 3 cannulated screws plus a self-designed anteromedial support plate after fracture reduction (scheme B). Continuous vertical force was applied using a mechanical testing machine. Changes in displacement were recorded and load-displacement curves were plotted. One volunteer (female, 28 years old, 168 cm in height and 65 kg in weight) was selected for finite element analysis of her CT images of both lower limbs to examine the maximum displacement and the maximum Mises stress in scheme A and scheme B respectively. Results:In groups A and B respectively: All the 6 biomimic mimetic bones had similar load and displacement curves, and similar fracture displacements (Dx) at different loading points (N X); the curves of 6 biomimic bones were highly fitted with S-shaped curve equation (the r-square value was close to 1). At the initial loading stage (0 N0.05). When the load was 100 N
