A microdiscectomy is a spine surgery that removes the portion of a herniated disc pressing on a nearby nerve. It is considered the gold standard surgical treatment for lumbar disc herniations and has a success rate of roughly 80 to 91% for relieving leg pain caused by nerve compression. The procedure uses a small incision and magnification tools, making it less invasive than traditional open back surgery.
Why the Surgery Is Performed
The most common reason for a microdiscectomy is sciatica, the sharp, shooting pain that radiates from the lower back down through the buttock and leg. This pain happens when a disc in the lower spine bulges or ruptures and pushes against a spinal nerve root. The two most frequently affected levels are L4-L5 and L5-S1, which sit in the lowest part of the lumbar spine. In addition to pain, a compressed nerve can cause numbness, tingling, or weakness in the leg or foot.
Surgery is typically recommended after conservative treatments like physical therapy and anti-inflammatory medications have failed to provide relief over several months. Candidates generally have nerve compression confirmed on MRI that matches the side and location of their symptoms. People with certain other spinal conditions, such as significant spinal stenosis, scoliosis greater than 10 degrees, or a herniation located far to the side within the spinal foramen, may need a different surgical approach.
What Happens During the Procedure
The surgeon makes a small incision over the affected disc level in the lower back. Using a microscope or magnifying loupes for enhanced visualization, they carefully move muscle tissue aside rather than cutting through it, which is what makes the approach less traumatic than older open techniques. A small window is created in the bony covering of the spinal canal to access the herniated disc material underneath.
Once the nerve root is visible, the surgeon gently retracts it and removes the fragment of disc that has herniated out of position. After the disc material is removed, the surgeon probes around the nerve in all directions to confirm that no remaining disc or ligament tissue is still causing compression. The goal is full decompression of the nerve, which allows it to heal and stops the pain signal.
The entire procedure typically takes about one to two hours, and most patients go home the same day or the following morning.
Success Rates and Long-Term Results
Microdiscectomy reliably outperforms non-surgical management for disc-related leg pain. In large studies, about 70 to 71% of surgical patients reported improvement in their primary symptom, compared to 43 to 56% of those treated without surgery. At six months after surgery, roughly 91% of patients achieved a successful outcome.
The results hold up well over time. A 10-year follow-up study found that the success rate dipped only slightly, from 91% at six months to 83% at a decade, and patient satisfaction remained high. That modest decline reflects the reality that some people develop new symptoms over the years, but the vast majority continue to benefit from the original surgery long after recovery.
Reherniation Risk
The most significant long-term concern after microdiscectomy is reherniation, where disc material pushes out again at the same level. In a large multicenter trial, the reherniation rate at two years was 25.3%, with the average recurrence happening about nine months after surgery. Not all reherniations require another operation. Some resolve with conservative care, but others do lead to repeat surgery.
This risk exists because the surgery removes only the herniated fragment, not the entire disc. The remaining disc tissue can bulge or rupture again, particularly during activities that place heavy loads on the spine in the months following surgery.
Possible Complications
Microdiscectomy is a relatively safe procedure, but like any surgery, it carries risks. The most common complication is an incidental dural tear, where the thin membrane surrounding the spinal cord and nerves gets nicked during the operation. This occurs in roughly 3% of cases. If a tear happens, the most noticeable symptom afterward is a severe positional headache that worsens when you sit or stand and improves when you lie flat, sometimes accompanied by nausea. Most dural tears are repaired during the surgery itself and heal without lasting problems.
Less common complications include wound infection, nerve root injury, and ongoing pain that matches or exceeds pre-surgical levels. Serious neurological damage is rare.
What Recovery Looks Like
Many people notice immediate improvement in their leg pain after surgery, sometimes as soon as they wake up. Back pain at the incision site is normal and typically fades over a few weeks.
For the first two weeks, you’ll want to avoid strenuous physical activity, including vigorous sexual activity. During the first month, standard restrictions include limiting sitting to 15 to 30 minutes in any two-hour window, avoiding heavy household chores like vacuuming or doing laundry, and not lifting, bending, twisting, or pulling anything heavier than about 5 kilograms (roughly 11 pounds).
Most people return to desk work within two to four weeks and to more physically demanding jobs within six to twelve weeks, depending on how the recovery progresses. The nerve itself can take longer to fully heal. Numbness or mild tingling in the leg may linger for weeks or even months as the nerve recovers from the period of compression. The longer the nerve was compressed before surgery, the longer this residual sensation tends to last.