A lumbar discectomy is surgery to remove the damaged portion of a herniated disc in the lower back. The goal is to relieve pressure on a spinal nerve that’s causing pain, numbness, or weakness radiating down your leg. It’s one of the most common spinal surgeries performed, with success rates between 80% and 90% for relieving leg pain.
Why the Surgery Is Recommended
A herniated disc happens when the soft, gel-like center of a spinal disc pushes through a crack in the tougher outer layer. In the lumbar spine (lower back), that bulging material can press against nearby nerves, sending pain, tingling, or weakness down through your buttock and leg. This is commonly called sciatica.
Most herniated discs improve without surgery. Physical therapy, anti-inflammatory medications, and steroid injections resolve symptoms for many people within a few months. Surgery typically enters the conversation when conservative treatment fails to improve symptoms after 6 to 12 weeks, when leg or buttock pain becomes unmanageable, or when nerve compression causes muscle weakness that makes it difficult to stand or walk. In rare cases involving loss of bladder or bowel control, surgery becomes urgent.
What Happens During the Procedure
The surgeon makes a small incision in your lower back, moves aside muscle tissue, and removes the portion of the disc that’s pressing on the nerve. Only the damaged fragment is taken out, not the entire disc. The remaining disc tissue stays in place and continues to function as a cushion between vertebrae.
Most lumbar discectomies today are performed as microdiscectomies, which use a surgical microscope or magnifying lens and a smaller incision than older open techniques. This approach causes less damage to surrounding tissue, which generally translates to less post-operative pain and a faster recovery. The procedure typically takes about an hour, and most patients go home the same day or the following morning.
Before Surgery: Imaging and Evaluation
Before you’re cleared for surgery, your medical team will review imaging to map out exactly what’s going on in your spine. An MRI is the primary tool, showing the disc’s structure, the size and location of the herniation, and how it’s affecting the nerve. Plain X-rays help evaluate disc space height, bone spurs, and any curvature in the spine. In some cases, a CT scan or a provocative discogram (where dye is injected into the disc to reproduce your symptoms) provides additional detail.
Your surgeon will also confirm that you’ve given conservative treatments a genuine trial. Surgery works best when there’s a clear match between your symptoms and what the imaging shows, specifically a compressed nerve root that explains the pattern of pain or weakness in your leg.
Success Rates and Outcomes
Lumbar microdiscectomy has a success rate of roughly 70% to 90%, with most surgeons quoting 80% to 85% as a realistic expectation. “Success” here primarily means significant relief of the radiating leg pain. The procedure works best for leg symptoms caused by nerve compression. It’s less reliable for isolated low back pain without a clear nerve component.
Timing matters. The best surgical outcomes occur in patients who don’t postpone surgery longer than six months to one year after symptoms begin. Beyond one year of persistent symptoms, success rates can drop, though they still remain around 80%. This doesn’t mean you should rush into surgery, but if conservative treatment isn’t working after several months, waiting indefinitely may not improve your odds.
Risks and Complications
Lumbar discectomy is considered a safe procedure, but like any surgery it carries risks. The most commonly discussed complication is a dural tear, where the thin membrane surrounding the spinal cord and nerves gets nicked during surgery. In one prospective study of 131 discectomy patients, 6 experienced a dural tear. When this happens, the surgeon typically repairs it during the same operation, and most patients recover without lasting effects. The risk is higher for older patients and for anyone who has had previous spine surgery at the same level.
The other significant concern is reherniation, where disc material pushes out again at the same spot. Published rates for reherniation after a first-time discectomy sit around 6%, regardless of which surgical technique is used. Over an eight-year follow-up, roughly 5% to 6% of patients needed a second surgery at the same level. Other possible complications include infection at the incision site and, rarely, nerve root injury.
Recovery: The First Two Weeks
Walking is encouraged almost immediately, often starting the day after surgery. During the first two weeks, short walks are the main form of activity, with the goal of gradually building up endurance. You’ll be told to avoid sitting for longer than 30 to 45 minutes at a stretch, since prolonged sitting increases pressure on the healing disc.
Several movement restrictions apply right from the start. You’ll need to avoid bending, lifting, and twisting at the waist (sometimes called “BLTs” in rehab shorthand). Lifting anything over 20 pounds is off-limits for up to three months. Practical adjustments become part of daily life: bending with your knees instead of your waist to reach the floor, bringing your foot up to you when putting on socks or shoes rather than bending down, and scooting to the front of a chair before standing. Driving isn’t permitted while you’re taking narcotic pain medication.
Recovery: Weeks 2 Through 6 and Beyond
Light stretching and gentle exercises typically begin in the first few weeks. Formal outpatient physical therapy usually starts around week three, with sessions two to three times per week for six to eight weeks. Early PT focuses on walking endurance (aiming for 30-minute walks twice a day), posture correction, and learning to perform everyday tasks without stressing your lower back.
Returning to a desk job is often possible within two to four weeks, though starting with half-days before going back full-time is a common approach. Jobs that involve physical labor take longer. Heavy lifting, yard work, and contact sports are typically restricted for at least six weeks, and many surgeons extend the lifting restriction to three months. Stationary bikes, rowing machines, and exercises involving deep bending or arching of the lower back are also avoided during this period.
By the three-month mark, most people have returned to their normal activities. Full nerve recovery can take longer, sometimes up to six months or more, especially if the nerve was compressed for a long time before surgery. Residual numbness or mild tingling may linger even after the pain has resolved, gradually improving as the nerve heals.