Osteosynthesis of an extra-articular distal radius fracture using a palmar locking plate with 4 epiphyseal screws (Gold Standard) versus 2 epiphyseal screws: Finite element analysis

Abstract

Distal radius fractures are common injuries often requiring surgical intervention for effective management. This study compares the biomechanical stability of two osteosynthesis configurations using a palmar locking plate with either four or two epiphyseal screws for extra-articular distal radius fractures.

Finite element analysis (FEA) was performed on nine antomical radius models to evaluate displacement, axial stiffness, peri‑implant stresses, and fracture risk using the Mohr-Coulomb criterion. Results demonstrated minimal differences in displacement between the two groups, with both configurations maintaining acceptable levels of stability under a 250 N load. Assemblies with four screws exhibited slightly higher axial stiffness (average 4362 N/mm) compared to two screws (average 3080 N/mm). Peri-implant stresses were generally higher in the two-screw models, yet remained within tolerable ranges.

This study is the first to analyze a two-epiphyseal screw configuration, offering insight into the feasibility of reducing screw count without compromising stability. Potential benefits include fewer surgical complications, reduced material use, and lower costs. However, limitations such as the small sample size, simplified loading conditions, and absence of osteodensitometry warrant further experimental validation.

The findings suggest that a two-epiphyseal screw assembly could serve as an effective alternative for distal radius fracture management, supporting its potential integration into clinical practice following experimental corroboration.