What is a Microdiscectomy?
Microdiscectomy is a minimally invasive surgical procedure performed to remove herniated disc material that is compressing a spinal nerve root. Using an operating microscope or magnifying loupe, Spine specialist makes a small incision to access the disc herniation and carefully removes only the portion of the disc (nucleus pulposus) that is pressing on the nerve.
This technique is called "microdiscectomy" because it uses microsurgical instruments and magnification to work with precision through a small opening. The advantage is that it preserves as much healthy disc and surrounding structures as possible, reduces muscle damage compared to open surgery, and allows faster recovery.
Microdiscectomy is particularly effective for patients with posterolateral, foraminal, or far-lateral disc herniations causing arm pain (cervical) or leg pain (lumbar).
What is a Microdiscectomy?
Microdiscectomy is a type of minimally invasive discectomy surgery commonly used to treat a herniated disc. When a herniated disc compresses a spinal nerve, symptoms can include pain radiating down one or both arms and legs, muscle weakness and difficulty with repetitive motions. During the operation, the surgeon frees the nerve by removing small fragments of disc, bone and ligament. Microdiscectomy is sometimes described as a minimally invasive surgery as it only requires a small incision at the site of injury.
Who might need a Microdiscectomy?
How Does Microdiscectomy Work?
Microdiscectomy works by removing the extruded or herniated disc material that is pressing on the nerve root, thereby decompressing the nerve and relieving pain. The procedure typically involves:
- A small incision (2–3 cm) over the affected disc level
- Minimal muscle dissection—muscles are gently separated or split rather than cut
- Use of an operating microscope to visualise the nerve root and disc material
- Careful exposure of the disc space and identification of the herniated fragment
- Removal of the herniated disc material using specialised microsurgical instruments (curettes, pituitary rongeurs)
- Decompression of the nerve root to confirm relief of compression
- Closure of the incision in layers
The key is that only the herniated disc material is removed—the healthy disc nucleus and annulus are preserved. This approach maintains more of the normal disc structure and function compared to larger open discectomies.
Who is a Candidate for Microdiscectomy?
Candidates have a confirmed a disc herniation on MRI or CT causing nerve root compression and symptomatic pain, typically in the arm or leg corresponding to the compressed nerve. Common indications include:
- Arm or leg pain (radiculopathy) caused by a herniated disc—the primary indication
- Sciatica (leg pain) from lumbar disc herniation
- Cervical radiculopathy (arm pain) from cervical disc herniation
- Failed conservative treatment (physical therapy, medications, epidural steroid injections) for at least 6 weeks
- Progressive neurological deficit (weakness, numbness) warranting earlier intervention
- Cauda equina syndrome (emergency: bilateral leg pain, bowel/bladder dysfunction, saddle anaesthesia)
Not all disc herniations require surgery. Many respond to conservative care. Dr. Huang will review your symptoms, imaging, and examination to determine if microdiscectomy is appropriate and safe.
What Happens During Microdiscectomy?
Microdiscectomy typically takes 45–90 minutes under general anaesthesia. Here is what to expect:
Step 1
Positioning and Incision
You will be positioned face-down (prone) on the operating table. A small incision (2–3 cm) is made over the affected disc level, typically slightly off-midline to one side.
Step 2
Muscle Access
Unlike open discectomy, the paraspinal muscles are not cut. Instead, they are gently separated (or split between muscle fibres) using a muscle-sparing technique. This minimises post-operative pain and dysfunction.
Step 3
Microscopic Dissection
With the operating microscope, Dr. Huang carefully identifies the nerve root and the herniated disc material. A small portion of the lamina or ligament may be removed to expose the disc space.
Step 4
Disc Removal
The herniated nucleus pulposus is carefully removed using microsurgical instruments. Only the herniated or loose disc fragments are taken; healthy disc is preserved.
Step 5
Nerve Release and Closure
Once the disc material is removed, the nerve root is visibly decompressed. The muscle and incision are closed in layers. No fusion or instrumentation is needed.
What are the benefits of Microdiscectomy?
- Rapidly relieves leg or arm pain from disc herniation
- Small incision (2–3 cm) results in minimal muscle trauma
- Preserves healthy disc material, reducing risk of adjacent-segment disease
- Short hospital stay (typically 1–2 days or same-day discharge for selected patients)
- Fast return to light activities (2–4 weeks for desk work)
- Lower infection risk than open discectomy due to smaller incision
- Can be performed at lumbar, cervical, or thoracic levels
Risks and Considerations
- Infection (rare; low risk due to small incision)
- Bleeding or haematoma
- Nerve root injury or incomplete decompression
- Dural tear (puncture of membrane around spinal cord)
- Disc re-herniation (recurrence at the same level; approximately 5–15% of patients)
- Spinal instability or excessive motion at the operated level (rare if minimal bone is removed)
- Anaesthesia risks
Serious complications are uncommon. The small incision and muscle-sparing approach lower the risk profile compared to open discectomy.
What to Expect After Foraminotomy
Immediate Post-Operative (First 24 Hours)
Most patients can walk and mobilise shortly after surgery. Many are discharged home the same day or after an overnight stay. Pain is typically mild to moderate and well-controlled with prescribed medications.
Week 1–2
Expect mild incision soreness and general post-operative discomfort. Arm or leg pain from the herniation often improves dramatically within days to a week. Light walking is encouraged; avoid heavy activity.
Week 3–4
Most patients can return to desk work and light daily activities. Gradual increase in walking distance and light stretching. Pain continues to improve as inflammation settles.
Week 5–6
Return to most normal activities. Driving is typically safe once pain-controlled. Physical therapy may begin to rebuild strength and flexibility.
Recovery Guidelines Summary
- Avoid heavy lifting (>5 kg) for 4–6 weeks
- Avoid bending, twisting, and repetitive spinal movements for 4–6 weeks
- No driving for 1–2 weeks (or until pain-controlled and off strong pain medications)
- No high-impact sports or running for 6–8 weeks
- Walk gently and use good posture during daily activities
Most patients experience significant relief from leg or arm pain within 1–2 weeks. Full recovery takes 6 weeks, with most able to return to normal activities by this timepoint.
Frequently Asked Questions
Q1: What is the difference between microdiscectomy and open discectomy?
Microdiscectomy uses a small incision (2–3 cm) and operating microscope to precisely remove herniated disc. Open discectomy typically uses a larger incision (4–6 cm), may involve more bone removal, and has higher post-operative pain. Microdiscectomy allows faster recovery with less muscle damage.
Q2: Will I need fusion after microdiscectomy?
No. Microdiscectomy does not require fusion. The goal is to remove only the herniated disc material and preserve the healthy disc and spinal structures to maintain normal motion.
Q3: Can the disc herniation come back after microdiscectomy?
Disc re-herniation occurs in approximately 5–15% of patients over several years. If it happens, options include conservative management, repeat surgery, or fusion if combined with other pathology. Most patients enjoy sustained relief from their initial symptoms.
Q4: When can I return to work?
Most patients return to desk work within 2–4 weeks. Manual labour or jobs involving heavy lifting may require 6–8 weeks. Dr. Huang will advise based on your specific job demands and recovery progress.
Q5: Is microdiscectomy suitable if I also have spinal stenosis?
If spinal stenosis is also present, broader lumbar decompression surgery may be required beyond simple microdiscectomy. Dr. Huang will assess your imaging and determine the best approach.
This is educational content only and does not constitute medical advice. Consult Dr. Huang Yilun for personalised evaluation and recommendations.
To discuss whether microdiscectomy is right for your disc herniation, contact Dr. Huang at Total Orthopaedic Care and Surgery, Novena Medical Centre, Singapore.