Pterion Prep CraniPro VUMC Case Prep
2026-06-27

Case Prep: Tethered Cord Release

Case / Approach Snapshot

One-Liner

[Age]yo [M/F] [child/adult] with tethered cord syndrome ([tight filum / lipomyelomeningocele / post-repair retethering / split cord]) presenting with [back/leg pain, motor or sensory decline, bladder dysfunction, scoliosis, foot deformity] planned for [level] laminectomy for microsurgical untethering.

Figures, Imaging & Video

🎥 Operative video — search operative video on YouTube ▸ · The Neurosurgical Atlas ▸

🧭 Operative approach: Posterior thoracolumbar approach — midline lumbosacral exposure, laminoplasty/laminectomy, dural opening, and closure principles.

Neurosurgical Atlas · Radiopaedia · PubMed Central — operative figures © linked; see media-sources.md

High-Yield Literature

Curated Image Set

Open-access figures are embedded from PubMed Central articles and kept unique to this guide.

Tethered Cord Release — Fig. 1 Fig. 1. Patient 2 preoperative supine anteroposterior view (90 degrees T11–L3). Abbreviation: AP, anteroposterior. Source: Concurrent Tethered Cord Release and Growing-Rod Implantation—Is It Safe? — Global Spine Journal 2012; open access.

Tethered Cord Release — Fig. 2 Fig. 2. Patient 2 postoperative supine anteroposterior view (53 degrees T11–L3). Abbreviations: AP, anteroposterior; post op, postoperative. Source: Concurrent Tethered Cord Release and Growing-Rod Implantation—Is It Safe? — Global Spine Journal 2012; open access.

Tethered Cord Release — Fig. 3 Fig. 3. Patient 2 preoperative recumbent lateral view. Note thoracolumbar kyphosis. Source: Concurrent Tethered Cord Release and Growing-Rod Implantation—Is It Safe? — Global Spine Journal 2012; open access.

Tethered Cord Release — Fig. 4 Fig. 4. Patient 2 postoperative lateral view. Abbreviations: post op, postoperative. Source: Concurrent Tethered Cord Release and Growing-Rod Implantation—Is It Safe? — Global Spine Journal 2012; open access.

Tethered Cord Release — Figure 6 Figure 6. Source: Microsurgical efficacy in 326 children with tethered cord syndrome: a retrospective analysis — Neural Regen Res. 2019 Jan;14(1):149–55. doi: 10.4103/1673-5374.243720; CC BY-NC-SA.

Tethered Cord Release — Figure 2 Figure 2. Spina Bifida Neurological Scale (SBNS) functional classification of children with different types of tethered cord syndrome before surgery and 3 months after surgery (n = 326).Horizontal… Source: Microsurgical efficacy in 326 children with tethered cord syndrome: a retrospective analysis — Neural Regeneration Research 2019; CC BY-NC-SA.

Tethered Cord Release — Figure 3 Figure 3. Efficacy analysis of different types of tethered cord syndrome postoperatively.Horizontal axis shows the number of patients (n = 326). Source: Microsurgical efficacy in 326 children with tethered cord syndrome: a retrospective analysis — Neural Regeneration Research 2019; CC BY-NC-SA.

Tethered Cord Release — Figure 4 Figure 4. Efficacy percentage of different types of tethered cord syndrome postoperatively.Efficiency = (marked effect + stable)/total number of cases followed up (n = 326). Source: Microsurgical efficacy in 326 children with tethered cord syndrome: a retrospective analysis — Neural Regeneration Research 2019; CC BY-NC-SA.

Tethered Cord Release — Figure 10 Figure 10. Source: Microsurgical efficacy in 326 children with tethered cord syndrome: a retrospective analysis — Neural Regen Res. 2019 Jan;14(1):149–55. doi: 10.4103/1673-5374.243720; CC BY-NC-SA.

History of Present Illness

Past Medical History

Imaging Review

MRI Lumbosacral Spine (T1, T2)

Labs

Neurological Examination

Surgical Planning

Case Logistics, OR Needs & Orders

Diagnosis & Indication

Position

Key Surgical Steps

  1. Level localization, midline incision (over prior scar if retethering), laminectomy/laminoplasty over the tethering level
  2. Midline durotomy under microscope, tack-up; careful — adhesions/placode immediately deep (retethering)
  3. Tight filum: identify the filum terminale (distinct from nerve roots — midline, often fatty, may have a vessel; confirm with stimulation — filum does not produce EMG/movement, nerve roots do); coagulate and divide the filum, confirm cut ends retract
  4. Lipoma/lipomyelomeningocele: debulk lipoma (CUSA/laser), dissect the lipoma-cord interface, untether the placode, reconstruct (pial closure) to reduce retethering; intraoperative neuromonitoring/mapping to distinguish functional neural tissue
  5. Split cord (diastematomyelia): resect the bony/fibrous median septum, untether
  6. Dermal sinus: excise the entire tract to its termination (intradural inclusion — dermoid risk)
  7. Continuous EMG/stimulation to protect functional roots; confirm release
  8. Watertight dural closure, sealant; multilayer closure

Critical Anatomy & Structures at Risk

  1. Functional nerve roots / conus / placode — distinguish from filum (stimulation mapping); injury → motor/sensory/sphincter deficit
  2. Sphincter/bladder innervation (S2-4) — urodynamic decline
  3. Dura — watertight closure (CSF leak/pseudomeningocele common)
  4. Retethering (reconstruction technique), inclusion dermoid (incomplete sinus excision)

Equipment

Monitoring

Anesthesia

Potential Complications

  1. Neurological/urological decline (root/conus/sphincter injury)
  2. CSF leak / pseudomeningocele (closure)
  3. Retethering (esp. lipomas — lifelong risk), inclusion dermoid
  4. Wound issues, infection, hydrocephalus (dysraphism)

Operative Note Template

Preoperative Diagnosis: Tethered cord syndrome ([tight filum / lipomyelomeningocele / retethering / split cord]) at [level]

Postoperative Diagnosis: Same

Procedure: [Level] laminectomy/laminoplasty for microsurgical tethered cord release [filum sectioning / lipoma debulking and untethering / septum resection]

Surgeon / Assistant: Anesthesia: General endotracheal, no paralytic, latex-free EBL / Fluids: Adjuncts: Microscope, ultrasound, nerve stimulator/EMG (lower extremity + anal sphincter), bulbocavernosus reflex, CUSA (lipoma) Implants: Dural substitute, sealant Complications: None

Indications: [Age]yo [M/F] [child/adult] with symptomatic tethered cord (progressive [neuro/urologic] decline, [back/leg pain]) from [etiology]. Risks (neuro/sphincter decline, CSF leak, retethering) discussed; latex precautions observed.

Description of Procedure: After consent and time-out, general anesthesia was induced (no paralytic, latex-free) and neuromonitoring with sphincter EMG/BCR established. The patient was positioned prone; the level was localized and a laminectomy/laminoplasty performed [over prior scar if retethering]. A midline durotomy was made under the microscope, with care given to adhesions immediately deep to the dura.

[Tight filum: the filum was identified (midline, fatty), confirmed non-functional by stimulation (no EMG), and coagulated and divided, with the cut ends retracting.] [Lipoma: the lipoma was debulked (CUSA), the lipoma-cord interface dissected, the placode untethered, and a pial reconstruction performed to reduce retethering.] [Split cord: the median septum was resected.] Continuous EMG/stimulation protected functional roots and sacral function. A watertight dural closure was performed with sealant.

Multilayer closure was completed. The patient was kept flat per protocol and transferred with neuro/sphincter monitoring.

Postoperative Plan

Chief-Level Case Review

Use these as the senior-level mental model for Tethered Cord Release:

Common Pimp Questions

Use these to pressure-test preparation for Tethered Cord Release:

  1. What neurologic level and root are responsible for the presenting deficit?
  2. What is the decompression target and how will you know it is adequately decompressed?
  3. What instability, deformity, bone-quality, or fusion variable changes the construct?
  4. What vascular, visceral, dural, or neural structure is the main structure at risk?
  5. What postop brace, drain, mobilization, MAP, antibiotic, and DVT plan should be ordered?

Attending Preference Variables

Items that commonly vary by surgeon or institution: