Fig. 5

Illustration of the anatomical parameters in different levels. The solid black line indicates the width of lamina (from L5 to L3: 22 mm, 18.2 mm, 15.4 mm); the dotted black line indicates the height of lamina (from L5 to L3: 17.3 mm, 21.2 mm, 23.1 mm); the solid white line indicates the distance form lateral margin of pars to lateral border of vertebral body (from L5 to L3: 2.8 mm, 4.8 mm, 5.3 mm)