Suken A. Shah, MD Jon Oda, MD William Mackenzie, MD

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Tethered Cord Release and Concurrent Growing Rod Implantation: Is it safe? Suken A. Shah, MD Jon Oda, MD William Mackenzie, MD Muharrem Yazici, MD Growing Spine Study Group Alfred I. duPont Hospital for Children, Wilmington, DE USA Hacettepe University, Ankara, Turkey

Introduction Historically, patients with scoliosis associated with a tethered cord were treated in a staged fashion. However, modern neurophysiologic monitoring techniques have greatly increased the margin of safety. Now with current neuromonitoring techniques, tethered cord release and concomitant growing rod implantation can be performed safely.

Materials and Methods Retrospective case series with comparison control group Tethered cord defined as a conus lying distal to the caudal aspect of the L2 Exclusion criteria – multiple neural axis abnormalities, absence of distal neurologic function (ie. spina bifida). We identified 3 patients meeting criteria. Clinical symptomatology not a prerequisite

Surgical Technique Total intravenous anesthesia protocol SSEPs, TcMEPs, spontaneous and triggered EMG Neurosurgical release of tethered cord via L5-S1 laminectomy

Surgical Technique Dual growing rod instrumentation placed submuscularly with proximal and distal pedicle screw fixation Slow and gradual distraction of growing rod instrumentation under constant neurophysiologic surveillance Repeat lengthenings every 4-6 months

Results

Comparison Control Group 7 patients identified from the Growing Spine Study Group who had a tethered cord release and growing rod instrumentation for EOS All 7 patients had staged surgery Average immediate postop curve correction of 35.1 degrees (46.2% correction)

Patient #2 Preoperative supine AP (90 degrees) Postoperative supine AP (53 degrees)

Patient #2 Preoperative lateral (note thoracolumbar kyphosis) Postoperative lateral view

Discussion Staged Surgery?? The difficulty of the surgical procedures Inability to intraoperatively detect neurologic compromise Theoretical concern of a “double insult” to the cord has led surgeons in the past to recommend staged neurosurgical and orthopaedic surgery. Treatment of early onset scoliosis with concomitant intraspinal abnormalities has historically been associated with a high incidence of neurologic injury.

Discussion Disadvantages of staged surgery Multiple anesthetic exposures Risk of infection Patient comfort Need for repeat surgical dissection in the region of a previous laminectomy Disadvantages of staged surgery Multiple anesthetic exposures Risk of infection Patient comfort If tethered cord release and instrumentation levels coincide, need for repeat surgical dissection in the region of a previous laminectomy Modern Surgical Innovations Ability to detect and alleviate neurologic compromise intraoperatively with modern neurophysiologic monitoring With fluoroscopy and modern instrumentation, growing rod constructs can often be implanted with minimal surgical dissection, blood loss, and spinal column trauma

Conclusion We have performed 3 concomitant tethered cord release and growing rod insertion with an average correction of 43 degrees (48%), with no neurologic complications. Modern neurophysiologic monitoring with SSEPs, tcMEPs, trEMG is essential. We recommend slow and gradual distraction over several minutes. Further prospective studies are needed to better define efficacy and safety.