Fig. 5
From: Occipitocervical fusion complicated with cerebellar abscess: a case report
CT sagittal images of the failure of the OC fusion instruments. (a) The arrow showed the dislodgement of the occipital screw and the screw hole. The screw was loose and not in their original position. (b) The arrow indicated the oversized diameter of the screw hole. The diameter of the screw hole is much larger than the size of the screw, indicating that the screw has no fixing effect