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- Original Article Biomechanical finite element analysis of a Femoral Neck System fixation construct for femur neck fractures and clinical implications
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Hoon-Sang Sohn, MD, PhD1
, Se-Lin Jeong, BA2, Gu-Hee Jung, MD, PhD2,3 -
DOI: https://doi.org/10.12671/jmt.2025.00108
Published online: June 26, 2025
1Department of Orthopedic Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea
2Institute of Health Sciences (Medical ICT Convergence Research Center), Gyeongsang National University College of Medicine, Jinju, Korea
3Department of Orthopedic Surgery, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Korea
Received: 18 February 2025 • Revised: 14 April 2025 • Accepted: 17 April 2025
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Abstract
Background
This study assessed the structural/mechanical stability of fixation constructs with a Femoral Neck System (FNS) via finite element analysis after simulating femoral neck fractures and explored the clinical implications of the findings.
Methods
We simulated subcapital, transcervical, basicervical, and vertical fracture models using a right femur model (SAWBONES) and imported the implant model of FNS to Ansys (Ansys 19.0, Ansys Inc.) to place the implant in the optimal position. The distal end of the femur model was completely fixed and was abducted 7°. The force vector was set laterally at an angle of 3° and posteriorly at an angle of 15° in the vertical ground. The analysis was conducted using Ansys software with the von Mises stress (VMS) in megapascals (MPa).
Results
The maximum VMS of the fracture site was 67.01 MPa for a subcapital fracture, 68.56 MPa for a transcervical fracture, 344.54 MPa for a basicervical fracture, and 130.59 MPa for a vertical fracture. The maximum VMS of FNS was 840.34 MPa for a subcapital fracture, 637.37 MPa for a transcervical fracture, 464.07 MPa for a basicervical fracture, and 421.01 MPa for a vertical fracture. The maximum VMS of the implant corresponded to the value of the entire fixation construct; thus, FNS mainly functioned as a load-bearing implant. When we compared basicervical and vertical fractures, the stress distribution between the implant and the fracture sites differed significantly, and the basicervical fracture had higher VMS at the bone, implant, and fracture sites.
Conclusions
Considering the stress distribution of the assembly model, FNS fixation should be performed with consideration the osseous anchorage between the proximal bolt and cancellous bone of femoral head, and this technique might be appropriate for vertical fractures. Regarding the VMS at the fracture site, FNS might be applied cautiously only to basicervical fractures with anatomical reduction without a gap or comminution.
Level of evidence: IV.
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