ACDF - Anterior Cervical Discectomy and Fusion

When to perform ACDF

Myelopathy with progression or significant cord compression should not be delayed for conservative treatment.

When NOT to perform ACDF

Patient selection is critical for optimal outcomes.

Determining surgical levels

Careful level selection based on clinical-radiological correlation is essential.

Gold standard imaging

MRI should correlate with clinical findings to confirm surgical level(s).

Bone detail assessment

CT provides excellent bone detail for surgical planning.

Baseline and dynamic assessment

Flexion-extension views can reveal dynamic instability not seen on static imaging.

Electrodiagnostic studies

EMG/NCS can help localize pathology when clinical-radiological correlation is unclear.

For radiculopathy without myelopathy

Give adequate conservative trial unless progressive deficit or myelopathy.

Choosing the right procedure

ACDF remains the workhorse for 1-3 level anterior cervical pathology.

Smith-Robinson anterior cervical approach

Positioning:

• Supine with neck in neutral or slight extension
• Head on gel ring or Mayfield
• Arms tucked at sides
• Fluoroscopy to confirm level

The longus colli must be elevated carefully to protect the vertebral artery and sympathetic chain laterally.

Disc removal and decompression

Complete posterior decompression is essential for neural relief.

Interbody graft and plate

Graft options:

• Allograft bone: Structural support, no donor site morbidity
• Autograft (iliac crest): Gold standard for fusion, donor morbidity
• PEEK cage with bone graft/substitute: Most commonly used today
• Titanium cage: Good fusion, better radiographic assessment

Anterior plate increases fusion rate, especially in multilevel surgery.

Wound closure and postoperative care

Close monitoring for first 24-48 hours for hematoma development.

Frequently encountered issues

Dysphagia is the most common complication but usually resolves within weeks.

Give the dysphagia trajectory rather than a single number, because "usually resolves" is what patients want quantified. Prospective swallowing assessment in 249 patients found dysphagia in 50.2% at 1 month, 32.2% at 2 months, 17.8% at 6 months and 12.5% at 12 months — so it is near-universal early, halves by two months, and a residual minority still notices something at a year. What makes that tolerable to hear is the severity split: only 4.8% had moderate or severe dysphagia at 6 months. Female sex and multilevel surgery were the risk factors, so flag it more strongly in those patients. Vocal-cord paresis persisted in 1.3% at 12 months (prospective longitudinal study, Level II).

The adjacent-segment number patients actually need is cumulative, not annual, and the risk pattern is counter-intuitive. Across 374 patients and 409 arthrodeses followed up to 21 years, symptomatic adjacent-segment disease developed at a relatively constant 2.9% per year, and Kaplan-Meier survivorship predicted 25.6% — roughly one in four — within 10 years. Two-thirds of those affected ultimately needed further surgery. Risk was highest at C5-6 and C6-7.

The counter-intuitive part is worth stating explicitly because it inverts the natural assumption: single-level fusion carried a HIGHER adjacent-level risk than multilevel fusion. The likely explanation is selection — the levels left unfused after a single-level procedure are often already degenerate, whereas a multilevel fusion has already incorporated them. The practical corollary is not "fuse more levels"; it is to include all symptomatic degenerate levels rather than leaving a marginal one out, and to consider a motion-preserving option in suitable candidates.

Rare but significant

These rare complications require immediate recognition and treatment.

Delayed issues

Long-term follow-up identifies late complications requiring intervention.

First 24-48 hours

First 48 hours critical for hematoma detection.

Most patients return to sedentary work within 2-4 weeks.