Type II odontoid fracture, Obar, treated by posterior approach. Cervical profile radiograph showing the screw-rod technique interconnecting polyaxial screws at C1 and C2 (Harms's technique); and screws at occiput with rods. 

Context in source publication

Context 1

... rods (3.5 mm in diameter) were fixed to the connectors on the C1 and C-2 screw heads with locking nuts (Figure 1). ...