Biomechanical characterization of three iliac screw fixation methods: A finite aspect research.
J Clin Neurosci. 2018 Jun;52:109-114
Authors: Sohn S, Park TH, Chung CK, Kim YJ, Jang JW, Han IB, Lee SJ
We goal to characterize the biomechanical properties of a modified iliac screw fixation methodology in contrast with the traditional iliac screw fixation and the S2 alar iliac screw (S2AI) fixation utilizing a FEM. A 3-dimensional, non-linear FEM of lumbosacral backbone and pelvis (L1-pelvis) was modified to simulate three completely different iliac screw fixations based mostly on posterior screw fusion. The height von Mises stress (PVMS) values of the iliac screws within the three completely different iliac screw fixations have been recorded in throughout flexion/extension/axial rotation/lateral bending. The interplay stress which arose between the screw head and the shaft of iliac screws, was additionally measured for every case. The PVMS values of the three completely different iliac screw fixation methods have been decrease than the fatigue energy ranges beneath physiological loadings. PVMS of iliac screws was noticed within the screw shaft for S2AI, within the screw neck for the modified iliac screw approach, and within the offset connectors of the traditional iliac screw approach. The interplay between the screw head and the neck was compressed in modified iliac screw fixation approach. However, distraction drive was noticed within the S2AI approach between the screw head and the screw shaft. This FEM research helps our earlier medical outcomes, which discovered that the modified iliac screw fixation approach will be an efficient different sacropelvic fixation approach akin to the traditional iliac screw and the S2AI approach.
PMID: 29580745 [PubMed – indexed for MEDLINE]