Biomechanical evaluation of conventional locking compression plate and double locking compression plate combined with locking screw use to stabilize midshaft ulna fracture: A finite element study

This study explored the impact of midshaft ulna fractures on biomechanical performance of double locking compression (D-LCP) in comparison to conventional locking compression plates, utilizing finite element method. The study included transverse middle fractures stabilized with titanium implants, involving models of midshaft ulna and two fixation plates (D-LCP implant and C-LCP implant) created and aligned virtually using CAD. Four-node tetrahedral elements were employed in the finite element model, and regular daily activity loading conditions were applied to each model at axial compression, axial torsion, and lateral bending. EQV stress was observed around the distal screw contact in both C-LCP and D-LCP models, with D-LCP exhibiting lower EQV stress than C-LCP, particularly under axial compression. The D-LCP cases demonstrated less bone fracture displacement compared to C-LCP cases, providing valuable insights. Additionally, the bone stress in D-LCP revealed significantly lower levels compared to C-LCP.