Fig. 3From: A superior articular process morphology of 5th lumbar vertebra prone to screws placement failure: an anatomical study of 299 patientsScrew placement was performed on L5 vertebrae with different MCDs. A Vertebral MCD < 6 mm; B Vertebral MCD > 6 mm; C Pedicle screw perforation through the pedicles (bilateral perforation > 4 mm); D Pedicle screws did not break through the pediclesBack to article page