Fig. 4From: Effects of osteoporosis on the biomechanics of various supplemental fixations co-applied with oblique lumbar interbody fusion (OLIF): a finite element analysisSchematic mesh refinement of annulus ground, nucleus pulposus and facet cartilage in the normal model. (1–3 = No refinement, 4–6 = Mesh refinement-2X, 7–9 Mesh refinement-4X)Back to article page