Patient-specific computed tomography-based finite element analysis: a new tool to assess fracture risk in benign bone lesions of the femur

Haggai Schermann, Yair Gortzak, Yehuda Kollender, Solomon Dadia, Nir Trabelsi, Zohar Yosibash, Amir Sternheim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Background: Most benign active and latent lesions of proximal femur do not predispose a patient to a pathologic fracture. Nonetheless, there is a tendency to perform internal fixation due to the lack of accurate clinical tools that may reliably confirm low risk of pathologic fracture. As many as 30% of these surgeries may be unnecessary. A patient-specific CT-based finite element analysis may quantify bone strength and risk of fracture under normal weight-bearing conditions. Methods: The clinical relevance of such finite element analysis was investigated in a retrospective study on a cohort of 17 patients. Finite element analysis results (high risk = indication for surgery, low or moderate risk = follow-up) were compared to actual clinical decisions (surgery vs follow-up). All patients predicted by the finite element analysis as high risk underwent internal fixation and had good outcomes (n = 6). Findings: Four of the 11 low- and moderate-risk finite element analysis patients (36%) were operated immediately, and seven (64%) were either operated after a delay of at least 6 months or were never operated. None sustained a pathologic fracture. Patients who were predicted as low fracture risk by finite element analysis remained fracture-free for a minimal period of 6 months. Prediction of high risk of pathologic fracture by finite element analysis was in complete agreement with the conventional clinical evaluation. Interpretation: We consider finite element analysis a promising decision support system for the management of patients with benign tumors of femur, and that it may reliably endorse the decision to withhold surgery for patients at low fracture-risk.

Original languageEnglish
Article number105155
JournalClinical Biomechanics
Volume80
DOIs
StatePublished - 1 Dec 2020
Externally publishedYes

Keywords

  • Benign bone tumors
  • Bone strength
  • Femur
  • Finite element analysis
  • Fracture risk
  • Pathologic fracture

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine

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