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Comparative analysis for five fixations of Pauwels-I by the biomechanical finite-element method
Matthew Jian-Qiao Peng1, Hai-Yan Chen2, XiangYang Ju3
1Orthopedics Dept. of 1st Affiliated Hospital, GuangZhou Medical University, GuangDong, China.
Summary
Multiple Lag Screw (MLS) or Locking Plate (LP) fixation, with optional HemiArthroplasty (HA), are biomechanically optimized for Pauwels-I femoral neck fractures, showing superior stress distribution compared to Dynamic Hip Screw (DHS) options.
Area of Science:
- Orthopedic biomechanics
- Finite element analysis in fracture fixation
- Surgical implant performance evaluation
Background:
- Limited understanding of biomechanical principles governing common hip fracture fixation devices.
- Established therapeutic techniques include Dynamic Hip Screw (DHS), Multiple Lag Screw (MLS), DHS+LS, Locking Plate (LP), and HemiArthroplasty (HA).
- Need for comparative biomechanical analysis to determine optimal fixation for specific fracture types.
Purpose of the Study:
- To construct numerical finite element models of Pauwels-I femoral neck fractures.
- To determine the most biomechanically optimized fixation option through comparative analysis.
- To evaluate the performance of five common fixation techniques: DHS, MLS, DHS+LS, LP, and HA.
Main Methods:
- Extraction of 3D femoral models from CT scans using Mimics software.
- Creation of simulative osteotomy and solid models using Geomagic Studio and UG.
- Virtual design of five fixture types (DHS, MLS, DHS+LS, LP, HA) in Pro-Engineer, followed by finite element analysis in Ansys after assembly in HyperMesh.
Main Results:
- Finite element analysis models for four fixation types and one HA simulation for Pauwels-I fractures were successfully created and validated.
- Displacement analysis showed no significant differences among the five fixtures, ranging from 0.3801 to 0.7536 mm.
- Stress analysis revealed significantly lower peak stresses for MLS, LP, and HA (averaging ~43.6 MPa) compared to DHS+LS (~66.5 MPa) and DHS (~105.6 MPa).
Conclusions:
- Multiple Lag Screw (MLS) or Locking Plate (LP) fixation demonstrate superior biomechanical performance in terms of stress distribution for Pauwels-I fractures.
- HemiArthroplasty (HA) also shows favorable stress characteristics, comparable to MLS and LP.
- Clinical recommendation for Pauwels-I fractures includes MLS or LP, with HA as a viable alternative for optimizing patient outcomes.
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