Fig. 1From: Biomechanical role of osteoporosis affects the incidence of adjacent segment disease after percutaneous transforaminal endoscopic discectomyDiagrams of model reconstruction (all ligaments have been hidden in the schematic diagrams for PTED in order to display the surgical procedures clearly. And osteoporosis has been omitted for reconstruction, of which only adjusted material properties without the change of structures are shown) a Schematic diagram of the complete lumbosacral model. b Model 1: contact model. c Model 2: PTED modelBack to article page