Biomechanical evaluation of reconstruction plates with locking, nonlocking, and hybrid screws configurations in calcaneal fracture: a finite element model study

Ching Hsuan Chen, Ching-Hua Hung, Yu Chun Hsu, Chen Sheng Chen, Chao Ching Chiang*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Calcaneal fractures are the most common fractures of the tarsal bones. The stability of fixation is an important factor for successful reconstruction of calcaneal fractures. The purpose of this study was to analyze the biomechanical influence of plate fixation with different combinations of locking and nonlocking screws during early weight-bearing phase. A three-dimensional FE foot model was established using ANSYS software, which comprised bones, cartilages, plantar fascia, and soft tissue. Calcaneal plate was fixed with whole locking (WLS), whole nonlocking (WNS), and hybrid screw configurations for FE analysis. The WNS generated a 6.1° and 2.2° Bohler angle decrease compared with the intact model and WLS (WNS: 18.9; WLS: 21.1; intact: 25.0°). Some hybrid screw configurations (Bohler angle: 21.5° and 21.2°) generated stability similar to WLS. The FE results showed that the fragments at the posterior facet and the posterior tuberosity sustained more stress. This study recommends that the hybrid screw configuration with at least four locking screws, two at the posterior facet fragment and two at the posterior tuberosity fragment, is the optimal choice for the fixation of Sanders type IIB calcaneal fractures.

Original languageEnglish
Pages (from-to)1799-1807
Number of pages9
JournalMedical and Biological Engineering and Computing
Volume55
Issue number10
DOIs
StatePublished - 1 Oct 2017

Keywords

  • Biomechanics
  • Calcaneal fracture
  • Finite element analysis
  • Hybrid configuration
  • Locking plate
  • Nonlocking plate
  • Sanders IIB

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