Biomechanical analysis of iliosacral and transiliac-transsacral screw combinations for fixation of undisplaced Denis II vertical shear fractures in dysmorphic sacrum.

ABSTRACT:

Background

Percutaneous iliosacral screws (ISS) and transiliac-transsacral screws (TTS) are effective for treating posterior pelvic ring instability. However, the biomechanical stability of undisplaced sacral dysmorphism fractures remains underexplored. This study evaluated various ISS and TTS combinations to provide a clinical reference for fixing such fractures.

Methods

A finite element model of a complete Denis type II dysmorphic sacral fracture (extending through the sacral foramen) was developed. The stability of the posterior pelvic ring was evaluated using seven fixation techniques: S1-ISS (Group 1), S2-ISS (Group 2), S1-ISS + S2-ISS (Group 3), S2-TTS (Group 4), anterior S1-ISS + S2-TTS (Group 5), middle S1-ISS + S2-TTS (Group 6), and posterior S1-ISS + S2-TTS (Group

SUBMITTER: Zhao P 

PROVIDER: S-EPMC12517282 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature