Anterior transpedicular screws in conjunction with plate fixation and fusion for the treatment of subaxial cervical spine diseases

This study aimed at exploring the clinical application of anterior transpedicular screw (ATPS) and plate in the reconstruction of subaxial cervical spine. 8 cases were reconstructed by ATPS and plate in the subaxial cervical spine from Jan 2009 to Dec 2011. X-rays and computed tomography images were collected to evaluate the position of ATPS. Magnetic resonance imaging was also included to evaluate the result of decompression, the existence of epidural hematoma and the morphology of the cervical spinal cord. Japanese Orthopaedic Association scores were observed before and after operation as a functional estimation. All of the eight cases were followed up from 3 to 36 months with the average of 15.5 months. A total of 16 ATPS were implanted in the subaxial cervical spine in the eight patients. All the screws were inserted smoothly. Bone fusion was found in all the subjects 4.5 months after operation on average. No loosening or breakage of the internal fixation was observed in our study. Hoarseness was observed in one case due to distraction injury of the recurrent laryngeal nerve, which disappeared after 3 weeks' conservative treatment. Dysphagia was complained by two patients after surgery, which was alleviated 3 months later. There were four screws deviating less than 1 mm (Grade 1), two medially and two laterally. All the anterior compressions were removed completely in this group. Only a small amount of epidural hematoma was found in four cases on MRI images before discharge. The average JOA scores were significantly improved from 5.6 +/- A 1.4 before surgery to 14.5 +/- A 0.8 at discharge (P < 0.01), which decreased to 13.2 +/- A 1.2 at 3 months after operation, but improved again to 15.2 +/- A 0.8 at 1 year after operation. Although there are some complications, ATPS with plate is an effective and safe technique for anterior reconstruction in the subaxial cervical spine. Only those spine centers with sufficient experience in complex cervical spine reconstruction surgery can conduct this technique according to strict indications.