Open discectomy vs Microdiscectomy

If you have a herniated or bulging disc in your lower back, it can press on nearby nerves and cause pain, numbness, tingling, or weakness that travels down the leg, often called sciatica. When other treatments such as rest, physical therapy, or medications do not provide enough relief, surgery may be recommended.

Two common surgical options are open discectomy and microdiscectomy. Both procedures are designed to remove the part of the damaged disc that is putting pressure on the nerve, helping to reduce pain and improve movement. Although they have the same goal, the procedures are performed in different ways and may vary in incision size, recovery time, and potential risks.

At Complete Orthopedics, our experienced surgeons provide comprehensive evaluation and advanced treatment options for complex cervical spine conditions.

This page explains when open vs microdiscectomy may be recommended, how the procedure works, and what patients can expect throughout treatment and recovery.

What it is

Lumbar disc herniation is a common cause of sciatica, with a high prevalence in adults between 30 and 50 years old. The condition is particularly common in individuals who engage in activities that strain the lower back, such as heavy lifting or prolonged sitting. Approximately 10-15% of people with lumbar disc herniation will require surgery, with microdiscectomy and open discectomy being the two most common surgical interventions.

Why it Happens

A herniated disc occurs when the soft, inner portion (nucleus pulposus) of an intervertebral disc pushes through a tear in the tough outer layer (annulus fibrosus). This herniation can compress spinal nerves, leading to symptoms like radiating leg pain (sciatica), numbness, tingling, or weakness in the lower extremities. Over time, the spine undergoes degenerative changes, which can contribute to disc bulging and nerve compression. Repetitive stress, trauma, or poor posture can also contribute to the development of disc herniation.

How the Body Part Normally Works

The lumbar spine consists of five vertebrae (L1-L5) separated by intervertebral discs. These discs act as shock absorbers and allow for flexibility and movement of the spine. The spinal cord runs through the spinal canal, and nerves branch out through openings between the vertebrae. These spinal nerves control the sensation and movement of the lower body, including the legs, feet, and pelvic organs. When a disc herniates, it can compress these nerves, leading to symptoms such as pain, numbness, and weakness.

Clinical Presentation

• Radicular Pain (Sciatica): Pain that radiates from the lower back down the buttocks and into the legs.
• Numbness or Tingling: Sensation of “pins and needles” in the legs or feet.
• Weakness: Difficulty lifting the legs or feet, or feeling of instability.
• Back Pain: Localized pain in the lower back, often worsened by activity or movement.
• Loss of Reflexes: Reduced reflexes in the legs due to nerve compression.

Imaging Needed

• Physical Examination: To evaluate reflexes, strength, and areas of pain or numbness.
• MRI (Magnetic Resonance Imaging): The most effective tool for visualizing herniated discs and nerve compression.
• CT Scan: Provides a more detailed image of the bones and joints.
• X-rays: To rule out other causes of back pain such as fractures.
• Electromyography (EMG): To assess nerve function and confirm compression.

Other Problems That Can Feel Similar

Conditions that may mimic the symptoms of lumbar disc herniation include:

• Spinal Stenosis: Narrowing of the spinal canal, often leading to similar symptoms of leg pain and numbness.
• Piriformis Syndrome: Compression of the sciatic nerve by the piriformis muscle in the buttocks.
• Sacroiliac Joint Dysfunction: Pain in the lower back and buttocks that may radiate to the legs.
• Facet Joint Syndrome: Degeneration of the facet joints, causing pain similar to sciatica.

Treatment Options

Non-Surgical Care

• Physical Therapy: Strengthening the back and abdominal muscles to reduce pressure on the spine.
• Medications: NSAIDs or corticosteroids for pain and inflammation relief.
• Epidural Steroid Injections: To reduce inflammation around the nerve roots.
• Nerve Blocks: To target and alleviate pain in specific areas.

Surgical Procedures

Open Discectomy (OD)

• Procedure: Involves a midline skin incision, retraction of paravertebral tissues, partial laminectomy, and removal of the ligamentum flavum to expose the spinal cord and nerve roots. The disc material is then removed, and the posterior longitudinal ligament is opened.
• Duration: Significantly shorter operation time (37.82±7.15 minutes).

Microdiscectomy (MD)

• Procedure: Utilizes a microscope for better visualization, with minimal laminectomy and removal of the ligamentum flavum. The nerve root is retracted medially, and the disc contents are removed.
• Duration: Longer operation time (49.07±6.88 minutes).

What to Expect After Treatment

• Open Discectomy: Recovery time is generally longer due to the larger incision and more extensive tissue manipulation. Patients may need to stay in the hospital for 1-2 days and can expect a return to normal activities in 4-6 weeks.
• Microdiscectomy: Recovery is faster due to the minimally invasive nature of the procedure. Most patients can return to light activities within 1-2 weeks, with full recovery typically taking 4-6 weeks. Patients can usually go home the same day of the surgery.

Possible Risks or Side Effects

• Open Discectomy:
  • Infection: At the surgical site.
  • Nerve Injury: Rare, but can occur during the surgery.
  • Recurrent Herniation: The disc may herniate again at the same level.
  • Dural Tear: Accidental tear of the dura mater, requiring repair.
• Microdiscectomy:
  • Infection: Low risk, but possible.
  • Nerve Injury: Less common due to better visualization.
  • Recurrent Herniation: Can occur, but less likely with a successful procedure.
  • Dural Tear: Rare, but may occur during the procedure.

Long-Term Outlook

Both open discectomy and microdiscectomy have high success rates for relieving pain and improving function. Most patients experience significant relief from sciatica and return to normal activities within a few weeks to a few months. However, there is a small risk of recurrent herniation, particularly if proper post-operative care is not followed.

Summary and Takeaway

Both open discectomy and microdiscectomy are highly effective surgeries for treating lumbar radiculopathy caused by herniated discs. Microdiscectomy has become the preferred choice due to its minimally invasive nature, quicker recovery, and fewer complications. The choice between the two procedures depends on the patient’s condition, the surgeon’s experience, and other factors like the extent of the herniation and patient preference.