Lumbar Discectomy

What is a lumbar discectomy?

Discectomy literally means “cutting the disc.” A discectomy can be performed anywhere along the spine from the neck (cervical) to the low back (lumbar). The surgeon reaches the damaged disc from the back (posterior) of the spine — through the muscles and bone. The surgeon accesses the disc by removing a portion of the lamina. The lamina is the bone that forms the backside of the spinal canal and makes a roof over the spinal cord. Next, the spinal nerve is retracted to one side. Depending on your particular case, one disc (single-level) or more (multi-level) may be removed.

A variety of surgical tools and techniques can be used to perform a discectomy. An “open” technique uses a large skin incision and muscle retraction so that the surgeon can directly view the area. A “minimally invasive” technique or a microendoscopic discectomy uses a small skin incision. A series of progressively larger tubes, called dilators, are used to tunnel through the muscles. Special instruments help the surgeon see and operate in a smaller space. A minimally invasive incision causes less disruption of the back muscles and may decrease recovery time. Your surgeon will recommend the technique most appropriate for your specific case.

A fusion may be done at the same time as the discectomy to help stabilize the spine for patients who are athletes, perform heavy labor, or have spinal instability. Fusion uses a combination of bone graft and hardware (screws/plates) to connect two vertebrae together. During the healing process, the two vertebrae fuse into one piece of bone. Fusion rarely needed for a herniated lumbar disc [1].

Who is a candidate?

You may be a candidate for a discectomy if you have:

• Diagnostic test (MRI, CT, myelogram) that show a herniated disc
• Significant pain, weakness, or numbness in your leg or foot
• Leg pain (sciatica) worse than back pain
• Symptoms that have not improved with physical therapy or medication
• Leg weakness, loss of feeling in the genital area, and loss of bladder or bowel control (cauda equina syndrome)

Posterior lumbar discectomy may be helpful in treating leg pain caused by:

• Bulging or herniated disc: The gel-like material within the disc can bulge or rupture through a weak area in the surrounding wall (annulus). Irritation and swelling occurs when this material squeezes out and painfully presses on a nerve.
• Degenerative disc disease: As discs naturally wear out, bone spurs form and facet joints inflame. The discs dry out and shrink, losing their flexibility and cushioning properties. The disc spaces get smaller. These changed lead to stenosis or disc herniation.

Surgery:

Most herniated discs heal after a few months of nonsurgical treatment. Your doctor may recommend treatment options, but only you can decide whether surgery is right for you. Be sure to consider all the risks and benefits before making your decision. Only 10% of people with herniated disc problems have enough pain after 6 weeks of nonsurgical treatment to consider surgery.

What happens before surgery?

You may be scheduled for presurgical tests (e.g., blood test, electrocardiogram, chest X-ray) several days before surgery. In the doctor’s office, you will sign consent and other forms so that the surgeon knows your medical history (allergies, medicines/vitamins, bleeding history, anesthesia reactions, previous surgeries). Discuss all medications (prescription, over-the-counter, and herbal supplements) you are taking with your health care provider. Some medications need to be continued or stopped the day of surgery.

Stop taking all non-steroidal anti-inflammatory medicines (Naprosyn, Advil, Motrin, Nuprin, Aleve, etc.) and blood thinners (Coumadin, Plavix, etc.) 1 to 2 weeks before surgery as directed by the doctor. Additionally, stop smoking, chewing tobacco, and drinking alcohol 1 week before and 2 weeks after surgery because these activities can cause bleeding problems. No food or drink is permitted past midnight the night before surgery.

 What happens during surgery?

There are five steps to the procedure. The operation generally lasts 1 to 2 hours.

Step 1: Prepare the patient

You will lie on your back on the operative table and be given anesthesia. Once asleep, you are rolled onto your stomach with your chest and sides supported by pillows. The are where the incision will be made is cleansed and prepped.

Step 2: Make an incision

With the aid of a fluoroscope (a special X-ray), the surgeon passes a thin needle through the skin down to the bone to locate the affected vertebra and disc.

In an open discectomy, a skin incision is made down the middle of your back over the affected vertebrae. The length of the incision depends on how many discectomies will be performed. A single-level incision is about 1 to 2 inches long. The back muscles are retracted on one side to expose the bony vertebra. An X-ray is taken to verify the correct vertebra.

In a minimally invasive discectomy, a small incision (less than 1 inch) is made to one side of your back. Next, a series of progressively larger dilators are passed, one around the other, to gradually separate the muscles and create a tunnel to the bony vertebra.

Step 3: Make a laminotomy

Next, a small opening of the lamina, above and below the spinal nerve, is made with a drill or bone-biting tools. A laminotomy can be done on one (unilateral) or both (bilateral) sides, or on multiple vertebrae levels.

Step 4: Remove the disc fragments

With the lamina removed, the surgeon gently retracts the protective sax of the nerve root. The surgeon looks through a surgical microscope to find the herniated disc. Only the ruptured portion of the disc is removed to decompress the spinal nerve root. The entire disc is not removed. Bone spurs or a synovial cyst that may press on the nerve root are also removed.

For a single-level lumbar discectomy, fusion is rarely performed. However, other conditions, such as recurrent disc herniation or spinal instability, may be treated with a fusion.

Step 5: Close the incision

The retractor holding the muscles is removed. The muscle and skin incisions are sewn together with sutures or staples. Ster-strips are placed across the incision.

What happens after surgery?

You will awaken in the postoperative recovery area, called the PACU. Blood pressure, heart rate, and respiration will be monitored. Any pain will be addressed. Once awake, you will be moved to a regular room where you’ll increase your activity level (sitting in a chair, walking). Most patients can go home the same day. Other patients can be released from the hospital in 1 to 2 days. 

Recovery and prevention:

Schedule a follow-up appointment with your surgeon for 2 weeks after surgery. Physical therapy may be necessary for some people. 

The recovery time varies from 1 to 4 weeks depending on the underlying disease treated and your general health. You may feel pain at the site of the incision. The original pain may not be completely relieved immediately after surgery. Aim to keep a positive attitude and diligently perform your physical therapy exercises if prescribed.

Most people can return to work in 2 to 4 weeks or less with jobs that are not physically challenging. Other may need to wait at least 8 to 12 weeks to return to work for jobs that require heavy lifting or operating heavy machinery.

Recurrences of back pain are common. They key to avoiding recurrence is prevention:

• Proper lifting techniques
• Good posture during sitting, standing, moving, and sleeping
• Appropriate exercise program
• An ergonomic work area
• Healthy weight and lean body mass
• A positive attitude and relaxation techniques
• No smoking

What are the results?

Good results are achieved in 80 to 90% of patients treated with lumbar discectomy [2,3]. In a study that compared surgery and nonsurgical treatment for herniated discs, the outcomes were [2]:

• People with leg pain (sciatica) benefit more from surgery than those with back pain.
• People with less severe or improving pain do well with nonsurgical treatment.
• People with moderate to severe pain who had surgery notice a greater improvement than those who did not have surgery.

Similarly, minimally invasive discectomy techniques have been shown to be comparable in outcomes with open discectomy [4]. While the benefits of minimally invasive approaches include shorter operative time, less blood loss and muscle trauma, and faster recovery, these new techniques are not appropriate for all patients. Ask your surgeon if minimally invasive microendoscopic discectomy is appropriate for you.

Discectomy may provide faster pain relief than nonsurgical treatment. However, it is unclear whether surgery makes a different in what treatment may be needed later on. About 5 to 15% of patients will have a recurrent disc herniation, either at the same side or opposite side.

What are the risks? No surgery is without risks. General complications may include bleeding, infection, blood clots, and reactions to anesthesia. If spinal fusion is done at the same time as a discectomy, there is a greater risk of complications. Specific complications related to a discectomy may include:

• Deep vein thrombosis (DVT) is a potentially serious condition caused when blood clots form inside the leg veins. If the clots break free and travel to the lungs, lung collapse or even death is a risk. However, there are several ways to treat or prevent DVT. Get up and out of bed as soon as possible so your blood is moving and less likely to clot. Support hose and pulsatile stockings can keep the blood from pooling in the veins. Drugs, such as aspirin, Heparin, or Coumadin, may also be used.
• Lung problems: Lungs need to be working their best after surgery to provide tissues with enough oxygen to heal. If the lungs have collapsed areas, mucus and bacteria build up can lead to pneumonia. You nurse will encourage you to breath deeply and cough often.
• Nerve damage or persistent pain

Please call 515.875.9560 with any questions or to speak with one of our spine specialists.

Sources

1. Resnick DS, et al. Guidelines for the performance of fusion procedures for degenerative disease of the lumbar spine. Part 8: lumbar fusion for disc herniation and radiculopathy. J Neurosurg Spine 2:673-78, 2005.
2. Atlas SJ, et al. Long-term outcomes of surgical and nonsurgical management of sciatica secondary to a lumbar disc herniation: 10-year results from the Main lumbar Spine Study. Spine, 30(8): 927-935, 2005.
3. Weinstein JN, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (Sport): a randomized trial. JAMA 296:2441-50, 2—6
4. Ryang YM, et al. Standard open microdiscectomy versus minimal access trocar microdiscectomy: results of a prospective randomized study. Neurosurgery 62:174-81, 2008.