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HomeHealth Guides & BlogsGeneral Orthopaedics & Spine CareCervical Spondylotic Myelopathy: Anterior Cervical Discectomy & Fusion (ACDF) vs. Cervical Disc Arthroplasty (CDA)
General Orthopaedics & Spine Care

Cervical Spondylotic Myelopathy: Anterior Cervical Discectomy & Fusion (ACDF) vs. Cervical Disc Arthroplasty (CDA)

10 min read
Sep 1, 2026
Spica Healthcare Clinical & Surgical Protocol Illustration #140

Clinical Summary & Key Takeaways

A definitive spine surgery review on Cervical Spondylotic Myelopathy (CSM), detailing hyperreflexia, Hoffman/Babinski signs, gait spasticity, microscope-assisted decompression, ACDF cage fusion, and motion-preserving Cervical Artificial Disc Replacement.

CRITICAL CLINICAL RED FLAG: Clumsiness in hands (difficulty buttoning shirts, handwriting deterioration, dropping objects), a heavy stiff-legged spastic walking gait, or electric-shock sensations down the spine on neck flexion (Lhermitte's sign) indicates spinal cord compression requiring urgent surgical evaluation.

1. Pathophysiology: Static vs. Dynamic Spinal Cord Compression

Cervical Spondylotic Myelopathy (CSM) is the most common cause of spinal cord dysfunction in adults over 50. Degenerative disc height collapse, osteophytic ridge formation, and ligamentum flavum hypertrophy narrow the cervical spinal canal (<12 mm anteroposterior diameter). Dynamic repetitive neck flexion and extension generate shear stress and microvascular ischemia in the spinal cord.

  • Upper Motor Neuron Signs: Hyperreflexia, positive Hoffman reflex, clonus, and positive Babinski sign.

  • Loss of Manual Dexterity: Inability to perform rapid finger-to-thumb opposition within 10 seconds (10-second grip-and-release test).

2. Anterior Cervical Discectomy and Fusion (ACDF)

The time-tested surgical benchmark for multi-level severe disc degeneration, kyphotic deformity, or facet arthrosis:

  1. Smith-Robinson Approach: Safe blunt dissection along natural tissue planes between the trachea/esophagus and carotid sheath.

  2. Microscopic Cord Decompression: Complete excision of herniated disc, posterior longitudinal ligament (PLL), and compressing osteophytes under 4K operative magnification.

  3. Interbody PEEK/Titanium Cage: Packed with osteoinductive bone graft and secured with an anterior titanium cervical plate.

"Cervical disc arthroplasty preserves physiological neck motion and prevents adjacent segment disease, offering active patients a fast recovery without bone graft harvesting." — Dr. Deepak Garg
Spica Healthcare Clinical & Surgical Protocol Illustration #140
Spica Healthcare Clinical & Surgical Protocol Illustration #140

3. Cervical Disc Arthroplasty (CDA / Artificial Disc Replacement)

For single or two-level disease with preserved baseline motion and absence of severe facet arthritis, artificial disc replacement preserves segmental kinematics and reduces adjacent level strain from 25% down to <5%.

CLINICAL CAUTION: Delaying surgical decompression in moderate-to-severe cervical myelopathy leads to permanent, irreversible spinal cord gliosis (hyperintense T2 signal on MRI) and chronic quadriparesis.

4. Recovery & Post-Operative Milestones

Mobilization on Day 1 without rigid cervical collars in disc replacement patients, with return to non-contact sports and full driving at 4 to 6 weeks.

5. Peer-Reviewed References & Clinical Guidelines

1. Cervical Disc Arthroplasty versus Anterior Cervical Discectomy and Fusion: 10-Year Results of a Randomized Trial — J Bone Joint Surg Am, 2021; 103(17): 1570-1580.

2. A Global Clinical Practice Guideline for the Management of Degenerative Cervical Myelopathy — Global Spine J, 2017; 7(3_suppl): 70S-86S.

Frequently Asked Patient Questions

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Dr. Deepak Garg - Director & Senior Joint Replacement, Spine and Orthopaedic Oncologist

Senior Consultant & Clinical Director — Orthopaedic Oncology & Robotic Joint Surgery

MBBS (TNMC Mumbai), DNB Orthopaedics (PGI & SP Miraj), Fellowship Arthroplasty and Arthroscopy (Fortis Hospital, New Delhi), Fellowship Orthopaedic Oncology (Rajiv Gandhi Cancer Institute, New Delhi)

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Dr. Deepak Garg - Director & Senior Joint Replacement, Spine and Orthopaedic Oncologist

Dr. Deepak Garg

Senior Consultant & Clinical Director — Orthopaedic Oncology & Robotic Joint Surgery

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MBBS (TNMC Mumbai), DNB Orthopaedics (PGI & SP Miraj), Fellowship Arthroplasty and Arthroscopy (Fortis Hospital, New Delhi), Fellowship Orthopaedic Oncology (Rajiv Gandhi Cancer Institute, New Delhi)

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