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• W2056574773 abstract "To determine the effect of cage/spacer stiffness on the stresses in the bone graft and cage subsidence.To investigate the effect of cage stiffness on the biomechanics of the fused segment in the lumbar region using finite element analysis.There are a wide variety of cage/spacer designs available for lumbar interbody fusion surgery. These range from circular, tapered, rectangular with and without curvature, and were initially manufactured using titanium alloy. Recent advances in the medical implant industry have resulted in using medical grade polyetheretherketone (PEEK). The biomechanical advantages of using different cage material in terms of stability, subsidence, and stresses in bone graft are not fully understood.A previously validated 3-dimensional, nonlinear finite element model of an intact L3-L5 segment was modified to simulate posterior interbody fusion spacers made of PEEK (E = 3.6 GPa) and titanium (E = 110 GPa) at the L4/5 disc with posterior instrumentation. Bone graft (E = 12 GPa) packed between the spacers in the intervertebral space was also simulated. The posterior lumbar interbody fusion spacer with instrumentation and graft represent a simulation of the condition present immediately after surgery.The peak centroidal Von Mises stresses in the graft bone increased by at least 9-fold with PEEK spacers as compared to titanium spacer. The peak centroidal Von Mises stresses in the endplates increased by at least 2.4-fold with titanium spacers over the PEEK spacers. These stresses were concentrated at places where the spacer interfaced with the endplate. The stiffness of the spacer did not affect the relative motion (stability) across the instrumented (L4/5) segment.Spacers less stiff than the graft will: (1) provide stability similar to titanium cages in the presence of posterior instrumentation, (2) reduce the stresses in endplates adjacent to the spacers, and (3) increase the load transfer through the graft, as evident from the increase in stresses in graft." @default.
• W2056574773 created "2016-06-24" @default.
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• W2056574773 date "2006-12-01" @default.
• W2056574773 modified "2023-10-18" @default.
• W2056574773 title "Biomechanical Rationale for Using Polyetheretherketone (PEEK) Spacers for Lumbar Interbody Fusion–A Finite Element Study" @default.
• W2056574773 cites W2002258559 @default.
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• W2056574773 doi "https://doi.org/10.1097/01.brs.0000250177.84168.ba" @default.
• W2056574773 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17172990" @default.
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