Case Prep: Lateral Lumbar Interbody Fusion (XLIF / OLIF)

Case / Approach Snapshot

• Anatomy at risk: level localization, cord/cauda equina, exiting and traversing roots, dura, vertebral artery or segmental vessels, esophagus/trachea/pleura/viscera by approach, and fusion/instrumentation landmarks.
• Operative steps: position and pad carefully, confirm level, expose the planned corridor, decompress neural elements, reconstruct or instrument when indicated, verify alignment/hardware, and close with attention to hematoma and wound risk; use the detailed operative sequence and approach notes below as the step-by-step source.
• Rescue plans: wrong level, durotomy, neurologic change, vertebral artery/visceral/pleural injury, graft or hardware problem, epidural hematoma, dysphagia/airway issue, and infection prevention/escalation.
• Figures: review Figures, Imaging & Video and the Curated Image Set; embedded local figures should remain open-access, public-domain, or otherwise reusable with attribution.
• Papers: review High-Yield Literature for seminal sources, modern reviews, and outcome data specific to this page.

One-Liner

[Age]yo [M/F] with [degenerative disc disease / scoliosis / spondylolisthesis / adjacent segment disease] at [L_-L_] planned for lateral (transpsoas XLIF / anterior-to-psoas OLIF) lumbar interbody fusion [± posterior fixation].

Figures, Imaging & Video

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

🧭 Operative approach: Transpsoas lateral (LLIF/XLIF/OLIF) approach — detailed corridor setup, step-by-step technique & figures

Neurosurgical Atlas · AO Spine / Surgery Reference · Radiopaedia · PubMed Central — operative figures © linked; see media-sources.md

High-Yield Literature

• Lateral Lumbar Interbody Fusion — Taba HA. Neurosurgery clinics of North America 2020. PubMed
• Lumbar interbody fusion: techniques, indications and comparison of interbody fusion options including PLIF, TLIF, MI-TLIF, OLIF/ATP, LLIF and ALIF — Mobbs RJ. Journal of spine surgery (Hong Kong) 2015. PubMed
• Lateral lumbar interbody fusion in adult spine deformity - A review of literature — Batheja D. Journal of clinical orthopaedics and trauma 2021. PubMed
• Lateral Lumbar Interbody Fusion-Outcomes and Complications — Salzmann SN. Current reviews in musculoskeletal medicine 2017. PubMed
• The Evolution of Lateral Lumbar Interbody Fusion: A Journey from Past to Present — Wong AXJ. Medicina (Kaunas, Lithuania) 2024. PubMed
• Lateral Lumbar Interbody Fusion: Review of Surgical Technique and Postoperative Multimodality Imaging Findings — Wangaryattawanich P. AJR. American journal of roentgenology 2021. PubMed
• Lateral Lumbar Interbody Fusion — Pawar A. Asian spine journal 2015. PubMed
• Single Position Prone Lateral Lumbar Interbody Fusion: A Review of the Current Literature — Jacome FP. Current reviews in musculoskeletal medicine 2024. PubMed
• Lateral Lumbar Interbody Fusion: Indications, Outcomes, and Complications — Kwon B. The Journal of the American Academy of Orthopaedic Surgeons 2016. PubMed
• Subsidence Rates After Lateral Lumbar Interbody Fusion: A Systematic Review — Macki M. World neurosurgery 2019. PubMed

Curated Image Set

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

Figure 1. Pre-operative simulation in the PowerPoint® software and the first stage of the operation. The first stage involved pedicle screw insertion only without rod fixation. The pedicle screw… Source: Posterior Insertion of a Lateral Lumbar Interbody Fusion Cage for the Treatment of Osteoporotic Vertebral Fracture with Kyphotic Deformity: A Case Report — Journal of Orthopaedic Case Reports 2022; CC BY-NC-SA.

Figure 8. Source: Posterior Insertion of a Lateral Lumbar Interbody Fusion Cage for the Treatment of Osteoporotic Vertebral Fracture with Kyphotic Deformity: A Case Report — J Orthop Case Rep. 2022 Apr;12(4):75–8. doi: 10.13107/jocr.2022.v12.i04.2774; CC BY-NC-SA.

Figure 2. (a) Whole spine radiograph. (b) Computed tomography showing the unstable T11 fracture. (c) Whole spine standing radiograph 2 weeks postoperatively. The local kyphosis angle decreased… Source: Posterior Insertion of a Lateral Lumbar Interbody Fusion Cage for the Treatment of Osteoporotic Vertebral Fracture with Kyphotic Deformity: A Case Report — Journal of Orthopaedic Case Reports 2022; CC BY-NC-SA.

History of Present Illness

• Chief complaint: Back/leg pain, deformity, need for indirect decompression and large interbody
• Failed conservative management
• Lateral approach advantages: large interbody (indirect decompression by restoring height/foraminal volume), minimal posterior disruption, good for deformity/coronal correction
• Levels: L1-2 through L4-5 (XLIF); L5-S1 not accessible via transpsoas (iliac crest/vessels) — OLIF L5-S1 possible via different corridor

Past Medical History

• Prior retroperitoneal/abdominal surgery, vascular disease
• Hip/iliac crest anatomy (limits access to L4-5), psoas anatomy
• Standard PMH

Imaging Review

MRI/X-ray/CT

• Disc/stenosis levels, alignment, coronal/sagittal deformity
• Vascular and psoas anatomy (axial MRI): great vessel position, lumbar plexus position within psoas (more posterior = safer corridor), “at-risk” levels (L4-5 plexus more anterior)
• Iliac crest height (L4-5 access), retroperitoneal anatomy
• Bone quality (subsidence risk)

Labs

• CBC, BMP, Coags, Type and screen, HbA1c

Neurological Examination

• Lower extremity exam, baseline hip flexion (psoas) and thigh sensation (genitofemoral/femoral) — approach can affect these

Surgical Planning

Case Logistics, OR Needs & Orders

• OR table/bed: radiolucent lateral-decubitus table with iliac crest near the table break, true AP/lateral fluoroscopy, hips/knees flexed, and secure taping.
• OR setup: radiolucent/Jackson table, fluoroscopy or O-arm/navigation, microscope/loupes for decompression, implant trays/graft ready for fusion, neuromonitoring for myelopathy/cord-risk cases, and postop brace plan confirmed.
• Special needs: arterial line/Foley/type-screen for long fusion/corpectomy, no long paralytic when MEPs are used, MAP/normotension for myelopathy or cord-risk cases, antibiotic redosing, and anticoagulation/DVT plan.
• Immediate postop orders: neuro checks by myotome/sensory level, airway/dysphagia watch for anterior cervical cases, CT/X-rays per construct, drain care, brace/activity orders, DVT prophylaxis timing, bowel regimen, and PT/OT mobilization.

Position

• OR table/bed: radiolucent lateral-decubitus table with iliac crest near the table break, true AP/lateral fluoroscopy, hips/knees flexed, and secure taping.
• True lateral decubitus (typically right-side-up/left-side-down for left retroperitoneal approach), break the table to open the disc space/iliac-rib window, secure with tape, axillary roll, pad pressure points
• Fluoroscopy must give true AP and lateral (square the patient to the table)

Key Surgical Steps (XLIF — Transpsoas)

1. Lateral fluoroscopic localization, mark disc trajectory
2. Small lateral flank incision, blunt finger dissection through retroperitoneal space to the psoas (sweep peritoneum anteriorly)
3. Transpsoas dilation with EMG-guided dilators — directional EMG to locate/avoid the lumbar plexus (advance through posterior-to-mid psoas at safe zone); place expandable retractor
4. Confirm position on fluoroscopy (mid-disc, avoiding posterior plexus and anterior vessels)
5. Discectomy with contralateral annular release, endplate prep (preserve endplate)
6. Trial and place wide lateral interbody cage (spanning both lateral cortical apophyseal rings for support) packed with graft
7. Restore disc/foraminal height (indirect decompression), correct coronal alignment
8. OLIF variant: anterior-to-psoas corridor (between psoas and great vessels) — avoids traversing psoas/plexus but requires vessel retraction
9. ± Lateral plate/screw or staged posterior pedicle screw fixation (often needed for stability)
10. Closure

Critical Anatomy & Structures at Risk

1. Lumbar plexus (within/posterior psoas) — femoral nerve, genitofemoral nerve → thigh weakness (hip flexion/knee extension), anterior thigh numbness/pain (especially L4-5); EMG monitoring essential
2. Great vessels (aorta/IVC, segmental vessels) — anterior; OLIF retracts vessels
3. Psoas muscle — transient hip flexor weakness/thigh pain (common, usually transient)
4. Ureter, bowel, sympathetic chain (retroperitoneal)
5. Subsidence (lateral cage on apophyseal ring — good support, but osteoporosis risk)

Equipment

• Lateral access/retractor system with EMG-directional dilators, neuromonitoring
• Lateral interbody cages + trials, graft, ± lateral plate
• Fluoroscopy, posterior pedicle screw set (if combined)

Monitoring

• EMG (free-run + triggered/directional — essential for psoas transit), MEP/SSEP for deformity

Anesthesia

• No paralytic (EMG), lateral positioning precautions, arterial line for deformity, type and screen

Potential Complications

1. Lumbar plexus injury — thigh weakness (hip flexion, quads), numbness, pain (esp. L4-5); often transient psoas-related, but femoral nerve injury can be lasting
2. Vascular injury, bowel/ureter injury
3. Subsidence, cage migration, pseudarthrosis
4. Ileus, incisional flank bulge/hernia, sympathetic changes

Operative Note Template

Preoperative Diagnosis: [Degenerative disc disease / scoliosis / adjacent segment disease] at [L_-L_]

Postoperative Diagnosis: Same

Procedure: Lateral lumbar interbody fusion ([XLIF transpsoas / OLIF anterior-to-psoas] at [L_-L_]) [± posterior pedicle screw fixation]

Surgeon / Assistant: Anesthesia: General endotracheal, no paralytic (EMG) EBL / Fluids: Adjuncts: Lateral access retractor with directional EMG dilators, fluoroscopy; neuromonitoring Implants: Lateral interbody cage, graft [± lateral plate; posterior screws] Complications: None

Indications: [Age]yo [M/F] with [pathology] at [L_-L_] amenable to indirect decompression via a large lateral interbody. Risks (lumbar plexus/thigh symptoms, vascular/visceral injury) discussed.

Description of Procedure: After consent and time-out, general anesthesia was induced (no paralytic for EMG) and the patient placed in true lateral decubitus with the table broken to open the disc space; true AP/lateral fluoroscopy was squared. A lateral flank incision was made and blunt retroperitoneal finger dissection carried to the psoas, sweeping the peritoneum anteriorly.

[XLIF: the psoas was traversed with EMG-directional dilators to locate and avoid the lumbar plexus, and the retractor docked mid-disc.] [OLIF: an anterior-to-psoas corridor between the psoas and great vessels was developed.] A discectomy with contralateral annular release and endplate preparation was performed, and a wide interbody cage spanning the apophyseal ring was placed with graft, restoring disc/foraminal height and coronal alignment. [Posterior pedicle screw fixation was added for stability.]

Closure was performed. The patient was transferred with documentation of hip-flexion/quad strength and thigh sensation (plexus).

Postoperative Plan

• Floor, neuro checks — document hip flexion strength, quad strength, thigh sensation (plexus)
• Counsel: transient thigh pain/numbness/hip flexor weakness common (usually resolves weeks-months)
• Mobilize POD0/1, X-rays, DVT prophylaxis
• Diet advance (ileus watch), activity/brace per surgeon
• Follow-up for fusion and plexopathy resolution

Chief-Level Case Review

Use these as the senior-level mental model for Lateral Lumbar Interbody Fusion (XLIF / OLIF):

• Decision point: Localize twice and instrument once: numbering, transitional anatomy, prior hardware, rib count, navigation dataset, and fluoroscopic level confirmation are mandatory.
• Technical lever: Positioning is treatment: table choice, abdomen-free prone setup, alignment goals, shoulders/hips, eyes/plexus pressure, neuromonitoring baselines, and fluoroscopic access all change the case.
• Bailout: Protect neural elements by sequence: decompression before correction when needed, MAP support for cord risk, no long paralytic with MEPs, and immediate response to signal change.
• Postop watch: Finish with construct logic: decompression adequacy, screw purchase, alignment, fusion bed/graft, drain plan, brace/activity orders, postop CT/X-rays, and DVT timing.

Common Pimp Questions

Use these to pressure-test preparation for Lateral Lumbar Interbody Fusion (XLIF / OLIF):

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:

• Positioning frame, arms, traction, and localization workflow: [attending-specific]
• Navigation/robot/fluoro use, screw system, graft/biologic choice, and drain threshold: [attending-specific]
• Neuromonitoring modality and MAP goal for myelopathy, deformity, or cord-risk cases: [attending-specific]
• Brace, Foley, antibiotics, mobilization, and DVT prophylaxis timing: [attending-specific]