Anderson type II fracture of the odontoid process: Results of anterior screw fixation

Controversy exists in the literature regarding the adequacy of one or two s crews for direct fixation of the odontoid process. Proponents of the two-sc rew technique believe that a single screw is not adequate to stabilize the fracture. Conversely, the insertion of two 3.5-mm screws in the medullary c avity of the odontoid process is technically difficult and can jeopardize t he surface area left for fracture healing. The authors conducted a prospect ive study of 30 cases with Anderson type LI fracture of the odontoid proces s treated by direct anterior fixation using the two-screw technique. The sc rews used were 2.7-mm cortical screws manufactured from titanium. Two C-arm s were used to control reduction of the displaced fracture and for its dire ct anterior stabilization. The operation was performed with the patients un der general anesthesia. The anterolateral incision was made at the level of C4 to facilitate exposure of the C2-C3 disk and for fracture fixation. No evidence of nonunion was encountered. Spontaneous fusion of the C2-C3 segme nt was found in one case. Limitation of rotation of the cervical spine was a subjective description in a single case. No major complications were attr ibuted to the surgical technique. The two 2.7-mm self-tapping titanium cort ical screws provided adequate stability for fixation of type II odontoid fr actures.