Finite ingredient mannequin predicts the biomechanical efficiency of transforaminal lumbar interbody fusion with varied porous additive manufactured cages.
Comput Biol Med. 2018 Feb 23;95:167-174
Authors: Zhang Z, Li H, Fogel GR, Xiang D, Liao Z, Liu W
In lumbar interbody fusion, a porous additive manufactured (AM) cage can present extra fascinating stiffness, and could also be useful to bone ingrowth. The biomechanical affect of porous cages on stability, subsidence, and aspect contact power has not been absolutely described. The purpose of this examine was to confirm biomechanical results of porous cages. Surgical finite ingredient (FE) mannequin of transforaminal lumbar interbody fusion (TLIF) was constructed. The partially porous (PP) cages and absolutely porous (FP) cages had been utilized. Mechanical exams had been carried out to acquire the mechanical parameters of porous supplies. The porous cages had been in comparison with strong titanium (TI) cage and strong PEEK cage. 4 movement modes had been simulated. Vary of movement (ROM), cage stress, endplate stress, and aspect joint power (FJF) had been in contrast. After interbody fusion, ROM decreased by greater than 90% in flexion, bending and rotation. In contrast with TI and PP cages, PEEK and FP cages considerably lowered the utmost stresses in cage and endplate in all movement modes. In contrast with PEEK cages, the stresses in cage and endplate for FP cages decreased, whereas the ROM elevated. In contrast amongst three FP cages, the stresses in cage and endplate decreased with growing porosity, whereas ROM elevated with growing porosity. FJF for varied cages was considerably lowered in comparison with the intact mannequin in all movement modes apart from flexion. In abstract, absolutely porous cages with a porosity of between 65% and 80% could provide a substitute for strong PEEK cages in TLIF.
PMID: 29501735 [PubMed – as supplied by publisher]