Fig. 2From: Biomechanical effects of interbody cage height on adjacent segments in patients with lumbar degeneration: a 3D finite element studyNormal lower lumbar spine model, three different degrees of degenerative lumbar spine models and TLIF operation model. a Normal lower lumbar spine model. b Mild degeneration model of L3–L4 segment. c Moderate degeneration model of L3–L4 segment. d Severe degeneration model of L3–L4 segment. e TLIF model of L4–L5 segmentBack to article page