Modern instrumentation for cervical stabilization in pediatric patients
For years, the pars and pedicle have been the primary fixation points in cervical spine-stabilization procedures in pediatric patients. Unfortunately, there are well-known downsides to the use of C2 pars/pedicle screws, including proximity to the vertebral artery and heightened risk of serious injury. In some cases, a patient’s anatomical anomalies make it impossible to attach a screw to these sections of the vertebrae.
Orthopedic surgeon Daniel Hedequist, MD, described these shortcomings in an article published in the Journal of the American Academy of Orthopaedic Surgeons in 2016 and suggested translaminar screws as a viable alternative. Translaminar screws have been shown to provide a biomechanically strong anchor and are a reasonable fixation option in even the youngest patients with cervical spine instability.
Because translaminar screws are placed on the opposite side of the spinous process, using translaminar screws avoids the risk of injuring the vertebral artery. Further, the majority of children over the age of 2 have anatomies appropriate for translaminar screw fixation. Because the instrumentation has not been well investigated in children, however, translaminar C2 screws have historically been used primarily in adult patients and are underutilized by pediatric surgeons.
Investigating translaminar screw utilization in children
In order to better understand the safety and efficacy of translaminar C2 screw fixation for pediatric patients, we searched surgical records of cervical spinal fusion surgeries that encompassed C2 from 2007 to 2017 in the Boston Children’s Hospital orthopedic database. Our analysis included types of C2 screw fixation, patient age, diagnosis, fusion level and procedure details.
In total, 23 patients met our inclusion criteria. Patients ranged in age from 5.2 to 17.8 years old, with a mean age of 12.6 years. Diagnoses included instability related to skeletal dysplasia, os odontoideum, congenital deformities, basilar invaginations, cervical spine tumors and spinal fracture. In the majority of cases, the decision to use translaminar screws was made preoperatively due to distortions in the patients’ anatomy that made it impossible to use pars screws.
In three cases, C2 translaminar screws were used as a salvage technique. In two cases, the patients’ suffered vertebral artery injury during dissection with distorted anatomy. In one other case, the vertebral artery intersected a tumor and was intentionally sacrificed. In six cases, no reason for this choice of screw was documented.
A safe and solid option for pediatric cervical spinal fusion surgery
There were no screw-related intraoperative or postoperative complications and no neurological injuries in any of the surgeries using C2 translaminar screws. All patients demonstrated clinical union or healing.
The results of this case series demonstrate that C2 translaminar screw fixation may be performed safely and serves as a solid base for fusions involving the upper cervical spine. We recommend pediatric orthopedic surgeons consider C2 translaminar screw fixation as a safe, effective technique for their pediatric patients undergoing cervical spinal fusion surgery.
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