Related Experiment Video
Updated: Sep 27, 2025
Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis
Published on: March 11, 2017
In Silico Finite Element Modeling of Stress Distribution in Osteosynthesis after Pertrochanteric Fractures
Jacek Lorkowski1, Mieczyslaw Pokorski2
1Department of Orthopedics, Traumatology, and Sports Medicine, Central Clinical Hospital of the Ministry of the Internal Affairs and Administration, 137 Woloska Street, 02-507 Warsaw, Poland.
This study found that gamma nail fixation (GNF) may be optimal for pertrochanteric femur fractures, showing similar bone stresses to dynamic hip screw (DHS) but with surgical benefits. In silico finite element modeling (FEM) shows promise for predicting fracture fixation outcomes.
Area of Science:
- Orthopedics
- Biomechanical Engineering
- Medical Imaging
Background:
- Pertrochanteric femur fracture stabilization remains a debated topic in orthopedic surgery.
- Current fixation methods include gamma nail fixation (GNF) and dynamic hip screw (DHS).
Purpose of the Study:
- To assess the feasibility of rapid in silico 2D finite element modeling (FEM) for predicting stress distribution in pertrochanteric femur fractures.
- To compare the biomechanical performance of GNF and DHS stabilization methods.
Main Methods:
- Developed 2D FEM models based on pre-surgery radiographs of 15 patients with AO/OTA type A1-A3 pertrochanteric fractures.
- Simulated stress distributions for both GNF and DHS fixation methods.
Main Results:
- FEM analysis revealed similar bone stress distributions for GNF and DHS, with stresses lower in A1 than A3 fractures (53-60 MPa).
- Fixation materials experienced approximately double the stress with GNF compared to DHS.
- GNF offers potential advantages including shorter surgery time, less dissection, and faster patient mobilization.
Conclusions:
- In silico FEM is a viable perioperative tool for predicting compressive stress distribution after osteosynthesis of pertrochanteric fractures.
- GNF stabilization is suggested as potentially more optimal due to surgical efficiency and comparable bone stress.
- Further research with larger datasets is needed to solidify FEM's role in pertrochanteric fracture treatment.
