Microdiscectomy

Overview

Microdiscectomy is the most commonly performed surgery for a herniated lumbar disc. Through a small incision, typically under an inch, the surgeon uses an operating microscope or magnifying loupes to remove only the piece of disc material that has pushed into the spinal canal and is pressing on a nerve root. The rest of the disc, the vertebrae, and the spinal joints are left in place, which is why the procedure is considered decompressive rather than a reconstructive or fusion surgery.

Because the exposure is small and muscle disruption is limited, most patients go home the same day or after one overnight stay and recover faster than with older, larger open discectomy techniques. The goal is specific: relieve leg pain (sciatica) caused by nerve root compression. It is not intended to treat back pain alone.

When it's recommended

Microdiscectomy is considered when a confirmed disc herniation on MRI matches the pattern of leg pain, numbness, or weakness found on physical exam, and when one of two situations applies. The first is persistent, disabling radicular leg pain that has not meaningfully improved after roughly six to twelve weeks of conservative care, including activity modification, physical therapy, medication, and often an epidural steroid injection. The second is a significant or progressive motor deficit, such as foot drop, which some surgeons treat surgically sooner because ongoing compression risks permanent nerve damage.

Cauda equina syndrome, marked by saddle numbness and new bowel or bladder dysfunction, is a related but distinct emergency requiring urgent surgery, not the elective timeline described here. Most disc herniations improve without surgery, so microdiscectomy is offered only after nonsurgical treatment has failed or in the setting of a clear neurologic deficit, not simply because a herniation is visible on a scan.

How it works

The patient is positioned face down under general anesthesia. The surgeon makes a small midline incision over the affected level, confirms the level with X-ray, and gently retracts the back muscles to the side rather than cutting through them. A small window is made in the bone and ligament (a laminotomy) to access the spinal canal, and the nerve root is carefully identified and protected while the herniated disc fragment is removed with fine instruments.

Some surgeons use a tubular retractor system to further limit muscle disruption; outcomes with tubular and standard microscopic techniques are broadly similar. Once the nerve root is decompressed and moves freely, the incision is closed in layers, usually without the need for hardware, bone graft, or fusion.

Preparing for the procedure

Preoperative preparation typically includes a recent MRI confirming the herniation matches the clinical exam, routine pre-anesthesia clearance, and a medication review, since blood thinners, aspirin, and certain supplements usually need to be stopped beforehand per the surgeon's instructions. Patients are counseled to arrange a ride home and help for the first few days, stop smoking if applicable to support healing, and plan time off work based on their job's physical demands. Most patients fast for several hours before surgery per the anesthesia team's instructions.

Recovery and aftercare

Many patients notice significant relief of leg pain within days, though numbness, tingling, or mild residual weakness can take weeks to months to resolve as the irritated nerve heals. For the first two to six weeks, patients are generally asked to avoid heavy lifting (typically over 10 to 15 pounds), repetitive bending and twisting, and prolonged sitting, while gradually increasing walking. Driving is usually resumed once off opioid pain medication and able to react normally, often within one to two weeks. Physical therapy is commonly introduced within the first several weeks to restore strength and movement patterns. Return to desk work is often possible within two to four weeks, while physically demanding jobs may take six to twelve weeks; full activity and exercise are typically cleared around three months, guided by the surgeon's individualized assessment.

Risks and considerations

Microdiscectomy has a strong track record for relieving leg pain, with most well-selected patients reporting substantial improvement. As with any spine surgery, risks include infection, bleeding, a dural tear (a small opening in the covering of the nerves, which occurs in roughly one in ten cases and is usually repaired at the time of surgery without lasting effect), and, rarely, nerve injury. Back pain, as opposed to leg pain, may persist since it can arise from disc degeneration itself rather than nerve compression.

The most common longer-term issue is recurrent disc herniation at the same level, occurring in an estimated 5 to 15 percent of patients, most often within the first few months, and it is the leading reason for a second operation. Outcomes tend to be less predictable in patients with longstanding symptoms, significant baseline weakness, obesity, or a primary complaint of back pain rather than leg pain, which is why careful patient selection is central to the decision to operate.