Ex vivo biomechanical analysis of different iliac osteosynthesis

Pelvic fractures are mostly multiple due to the local configuration and the poor muscle-tendinous support in the region. Surgical intervention must be considered in animals with a significant reduction of the pelvic canal, acetabulum fracture, coxo-femoral articulation instability or unilateral or bilateral instability. The aim of this research is to biomechanically test four different models of iliac osteosynthesis. It was used 40 swine hemipelvis, which were submitted to iliac body osteotomy and stabilized with simple hemi-cerclage, double hemi-cerclage, Steinmann pins fixated with methylmethacrylate (MMA) and cortical bone screws fixated with MMA. The compression strength necessary to deform the double hemi-cerclage (2525.2N) and the pins with MMA (2794.9N) did not differ statistically and these models presented higher resistance to the compression strength. Among the tested techniques, the double hemi-cerclage is more resistant for osteosynthesis of the body of the ilium pig's.

pelvic fracture; biomechanical models; hemi-cerclage; Steinmann pins