The biomechanical state of the thoracolumbar junction with various options of transpedicular fixation under flexion load

Introduction. Morphological and biomechanical features of the thoracolumbar junction determine large number cases traumatic bone injuries. Reconstructive stabilizing surgeries performed in this area, due to significant load on both elements hardware bony structures, require high reliability fixation. Objective. To study stress-strain state model section spine after Th12-L1 vertebrae resection with various options transpedicular fixation under influence flexion load. Materials methods. The mathematical finite-element human was studied. simulated condition surgery for a lesion laminectomy, facetectomy, corpectomy Th12 L1 vertebrae. Four variants were studied (using short or long bicortical screws, two crosslinks without them). Control points characterizing distribution structures metal fusion body replacement systems Results. Crosslinks have greatest effect reducing level stress models elements. When comparing length use monocortical screws determined minor advantages. analysis area screw entry into pedicle arch fixed (clinically zone) revealed that crosslinks, Th10, Th11, L2 L3 is 5.0, 1.9, 7.8 13.6 MPa, respectively, while presence reduces corresponding values 4.6, 7.3 12.7 MPa. In are 5.1, 2.3, 10.2, MPa absence 4.7, 1.8, 9.9, 12.2 presence. A similar trend observed other control points. results compression earlier, it established causes an increase by average 33.7%, 39.6%. Conclusions. case load, makes possible reduce all models, regardless used does not fundamental distribution.