Biomechanical analysis of lumbar interbody fusion supplemented with various posterior stabilization systems

Biomechanical comparison between rigid and non-rigid posterior stabilization systems following lumbar interbody fusion has been conducted in several studies. However, most of these previous studies mainly focused on investigating biomechanics adjacent spinal segments or spine stability. The objective the present study was to compare biomechanical responses devices when using different instrumentations. Finite-element model intact human (L1–sacrum) modified simulate implantation cage at L4–L5 level supplemented with including (i) pedicle screw-based fixation connecting rods (titanium rods), (ii) flexible (PEEK rods) (iii) dynamic interspinous spacer (DIAM). Stress were compared among various models under bending moments. highest lowest stresses endplate, bone graft found fused DIAM titanium rod systems, respectively. When PEEK for screw fixation, peak stress lower but ratio yield material higher than rod. Compared conventional system, use system (i.e., system) might increase risks subsidence damage, promote bony due graft. For reduce risk breakage increased itself.