Results: The mean values of anterior-posterior diameter at superior surface of the vertebral body level, at superior margin of pedicle level, at middle of pedicle level, at inferior margin of pedicle level and transverse diameter at superior margin of pedicle level, at middle of pedicle level, at inferior margin of pedicle level and angle at superior margin of pedicle level, at middle of pedicle level, at inferior margin of pedicle level of lateral recess are respectively 9.04 mm, 7.65 mm, 9.55 mm, 9.36 mm, 3.34 mm, 3.67 mm, 5.07 mm, 76.380, 80.840, 58.990.