Treatment of Odontoid Fractures in Elderly Patients Using C1/C2 Instrumented Fusion Supplemented With Bilateral Atlantoaxial Joint Spacers: A Case Series

Background: Spinal fractures are among the most common traumatic injuries in elderly patients. with the odontoid process being frequently affected. As this patient group usually has high rates of comorbidity and chronic diseases. a nonoperative approach may offer a reasonable solution for a favorable fracture pattern. Objective: We modified the procedure by implanting a bilateral atlantoaxial joint spacer (model DTRAX) into the joint space and review our experience utilizing this technique for the treatment of patients with a fracture of the odontoid process. Methods: A retrospective evaluation was performed on patients treated surgically for unstable traumatic fractures of the odontoid process. The stabilization was performed using a dorsal rod and screw instrumentation of the lateral mass of the atlas and the pars interarticularis of the axis. The procedure was further modified by implanting a bilateral atlantoaxial joint spacer (DTRAX) into the joint space bilaterally after the removal of the articular cartilage. Patients older than 70 years with a traumatic fracture of the odontoid process were included. Pain was assessed prepre- and postoperatively using the visual analog scale (VAS). To verify fusion during follow-up, either x-ray imaging of the cervical spine or magnetic resonance imaging or computed tomography were performed. Results: A total of 5 patients were included in our study. Four patients had an American Society of Anesthesiology score of 3 and 1 had a score of 4. The average duration of surgery was 187 +/- 38.1 minutes. The average blood loss during the procedure was 340 +/- 270 mL. The average radiological follow-up period was 21.2 +/- 175 months. Preoperatively, the average VAS pain score was 2.3 +/- 3.3. Postoperatively, the mean VAS decreased to 0.6 +/- 0.9. The average follow-up period for pain was 27.2 +/- 19 months. No patient showed neurological deficits before or after surgery. Follow-up demonstrated solid fusion in all cases. Conclusion: The fusion of the atlantoaxial joint with bilateral atlantoaxial joint spacers represents a suitable and feasible option for achieving high fusion rates in elderly patients with odontoid fractures.