Lumbar fusion is a surgical procedure performed to permanently join two or more vertebrae in the lower back (lumbar spine), usually to treat bigger problems in the spine than can be achieved with discectomy [link] or decompression [link]. Dr. Mahan recommends surgeries that preserve motion (aka “motion-sparing”) over fusion, except when the optimal treatment involves changing the spinal alignment – which is achieved with fusion surgery.
There are three common approaches to lumbar fusion surgery: open, tubular (or so-called minimally invasive or MIS) or endoscopic lumbar fusions. While Dr. Mahan performs all three – he prefers endoscopic and MIS lumbar fusion approaches.
Reasons for Lumbar Fusion Surgery
We might recommend a lumbar fusion if you are experiencing persistent and debilitating lower back pain, often accompanied by leg pain, numbness, or weakness, due to one or more of the following conditions:
Degenerative Disc Disease: As intervertebral discs wear down over time, they can lose height, bulge, or herniate, leading to pain, instability, and nerve compression. Lumbar fusion can stabilize the affected segments and alleviate these symptoms.
Slipped disc (Spondylolisthesis): This condition involves one vertebra slipping forward over the vertebra below it, which scissors on the nerves and narrows the spinal canal – frequently causing pain, nerve irritation, and potential spinal instability. Lumbar fusion stabilizes and largely reduces the slipped vertebra and prevent further slippage.
Recurrent Herniated Disc: While a discectomy (removal of the herniated portion of the disc) is often sufficient, if you’ve had multiple herniated discs – removing the fragment one more time may not be practical. Typically, on a third (or more) disc herniation, it’s time to fuse the segment, rather than prolong the inevitable.
Spinal Instability: Abnormal or excessive movement between vertebrae can lead to chronic pain and nerve irritation. Lumbar fusion aims to eliminate this abnormal motion and stabilize the spine.
Select Cases of Scoliosis: In certain carefully selected cases of spinal deformities, limited correction of scoliosis may be warranted. Dr. Mahan has chosen to not perform scoliosis surgeries – simply because it takes away time from perfecting his passion, which is endoscopic spine surgery.
The decision to proceed with endoscopic lumbar fusion is based on a comprehensive evaluation of your symptoms, physical examination findings, imaging studies (such as X-rays, MRI, and CT scans), and your overall health.
Details of the Endoscopic Lumbar Fusion Surgery
Endoscopic and MIS lumbar fusion is a minimally invasive approach that offers several potential advantages over traditional open spine surgery, including smaller incisions, less muscle damage, reduced blood loss, shorter hospital stays, and a faster recovery. Here’s a breakdown of the typical procedure:
Anesthesia: The surgery is typically performed under general anesthesia, meaning you will be completely asleep and pain-free throughout the procedure. In some endoscopic cases, regional anesthesia might be considered.
Small Incisions: Instead of a large open incision, the surgeon makes two or more much smaller incisions, usually less than an inch in length. The number and location of the incisions depend on the specific technique and the spinal levels being fused.
Endoscope Insertion: A thin, rigid or flexible tube with a camera and light source (endoscope) is inserted through one of the small incisions. This provides the surgeon with a magnified, beautiful and real-time view of the surgical area.
Disc removal and end-plate preparation: The disc between the vertebral bodies needs to be removed so that the vertebral bodies will fuse (or grow together with bone). This is perhaps the most critical intra-operative step for surgical success (besides appropriately choosing when to fuse and when not to fuse). Dr. Mahan will carefully prepare the surfaces of the vertebrae that need to be fused. Any bone spurs or other tissues that may be contributing to nerve compression can also be addressed through thorough decompression.
Bone Graft Placement: Bone graft material is placed between the prepared vertebral surfaces. This material stimulates new bone growth and eventually bridges the gap between the vertebrae, resulting in a solid fusion. The bone graft can be:
Autograft: Bone taken from another part of your own body (e.g., the iliac crest of the pelvis).
Allograft: Bone tissue from a deceased donor.
Synthetic Bone Substitutes: Artificial materials designed to promote bone growth.
Instrumentation: Spinal instrumentation, such as screws, rods, or plates made of biocompatible materials (e.g., titanium), is used to provide immediate stability to the fused segment and enhance the likelihood of successful fusion. These instruments are inserted through the small incisions and their placement is guided by the endoscopic view and fluoroscopy (real-time X-ray imaging).
Closure: Once the fusion and instrumentation (if used) are complete, the small incisions are closed with absorbable sutures and surgical tape.
The specific techniques and approaches used in endoscopic lumbar fusion will vary depending on the your anatomy and the specific spinal condition being treated.
Common endoscopic and MIS fusion techniques include:
Transforaminal Lumbar Interbody Fusion (TLIF): Accesses the intervertebral disc space through the neural foramen (the opening where nerve roots exit the spinal canal).
Lateral Interbody Fusion (LIF): Accesses the disc space from the side of the body. Endoscopic LIF techniques are still in evolution.
Posterior Lumbar Interbody Fusion (PLIF): Accesses the disc space from the back, similar to open PLIF but through smaller, endoscopic portals.
Benefits of endoscopic and MIS lumbar fusion
Endoscopic and MIS lumbar fusion surgery offers several compelling benefits compared to traditional open spine surgery, primarily due to its minimally invasive nature. These advantages can lead to a more positive surgical experience and recovery for patients:
- Smaller Incisions and Reduced Scarring: The procedure involves one or more small incisions, typically less than an inch long, rather than a large surgical cut. This results in significantly less visible scarring, which can be a cosmetic benefit and may also reduce the risk of wound-related complications.
- Less Muscle Damage: Endoscopic techniques allow surgeons to access the spine by gently separating muscles along their natural planes instead of cutting through them. This reduced muscle trauma translates to less post-operative pain, faster healing, and a quicker return to normal activities.
- Reduced Blood Loss: The minimally invasive approach typically leads to less bleeding during the surgery, potentially reducing the need for blood transfusions and the associated risks.
- Shorter Hospital Stay: Due to the reduced tissue disruption and faster recovery, patients undergoing endoscopic lumbar fusion often have a shorter hospital stay, sometimes being discharged the same day or the day after, compared to several days or a week with open surgery.
- Faster Recovery: With less muscle damage and pain, patients generally experience a quicker recovery and can return to their normal activities sooner compared to open surgery. This means a faster return to work, hobbies, and an improved quality of life.
- Reduced Risk of Infection: Smaller incisions inherently reduce the surface area exposed during surgery, potentially lowering the risk of surgical site infections.
- Enhanced Visualization: The endoscope provides the surgeon with a magnified and illuminated view of the surgical area, allowing for precise identification and treatment of the spinal pathology while minimizing disruption to surrounding healthy tissues.
- Potentially Less Post-operative Pain: Less muscle damage and smaller incisions typically result in less post-operative pain, reducing the reliance on strong pain medications and their potential side effects.
- Lower Risk of Complications: While all surgeries carry risks, the minimally invasive nature of endoscopic lumbar fusion may be associated with a lower overall risk of certain complications compared to open surgery, such as nerve damage and dural tears, although this can depend on the specific technique and surgeon’s experience.
It’s important to note that the suitability and specific benefits of endoscopic lumbar fusion can vary depending on the individual patient’s condition, anatomy, and the specific surgical technique employed. A thorough discussion with a qualified spine surgeon is crucial to determine if this procedure is the right option and to understand the potential benefits and risks in your specific situation.
Risks of Endoscopic and MIS Lumbar Fusion Surgery
While endoscopic and MIS lumbar fusion is a very safe surgery, like any surgical procedure, it carries potential risks. The minimally invasive nature of the technique can reduce some of these risks compared to traditional open surgery, but it’s important to be aware of them:
Infection: Infection at the surgical site or in the deeper tissues of the spine. This is reduced by endoscopic and MIS techniques, but can never be eliminated.
Bleeding: Excessive blood loss during or after the surgery, potentially requiring a blood transfusion or re-operation to remove a collection of blood (hematoma).
Nerve Damage: Injury to the spinal nerves or nerve roots, which can result in pain, numbness, weakness, or bowel and bladder dysfunction. This risk is often lower with endoscopic techniques due to the magnified visualization.
Dural Tear: A tear in the protective membrane (dura mater) surrounding the spinal cord and nerve roots, which can lead to a cerebrospinal fluid (CSF) leak. The irrigation used in endoscopic surgery reduces this risk – or approaches, such as lateral interbody fusion, where the dural lining is never approached during surgery.
Failure of Fusion (Non-union): The vertebrae may not fuse together properly, potentially leading to hardware dislodgement and the need for further surgery.
Hardware Complications: Problems with the implanted screws, rods, or plates, such as malposition, breakage, or migration, which may require revision surgery.
Persistent Pain: In some cases, pain may not be completely relieved or could even worsen after surgery. Unfortunately, back pain is common. We may only be able to improve one cause of back pain. Moreover, surgery cannot erase age. Age-related back pain is universal; unfortunately, spine surgery cannot make you 18 years old again.
Anesthesia-related complications: Adverse reactions to the anesthesia. The risks of your anesthesia is reviewed with you by our anesthesia team immediately prior to surgery. In some cases, when individuals have multiple medical problems, we may ask you to see our anesthesiologists prior to surgery to make the best plans.
Need for Conversion to Another Surgery: In unforeseen circumstances, our team may need to convert to a traditional open surgical approach during the procedure. This is exceptionally rare.
Medical complications: These are problems that are independent of the surgery, but may occur because in association with surgery. For example, blood clot may form in the legs (deep vein thrombosis – DVT) or lungs (pulmonary embolism – PE) if you are not moving much after surgery. Other examples include: opioid or other pain medication problems, such as drug dependence or addiction, bowel obstruction, etc.
Our team will discuss these risks with you in detail before the surgery, explain the precautions taken to minimize them, and answer any questions you may have.
Post-Operative Expectations and Recovery from Endoscopic Lumbar Fusion Surgery
The recovery period after endoscopic and MIS lumbar fusion is generally shorter and less painful compared to open fusion surgery. However, it’s crucial to follow your surgeon’s instructions carefully to ensure proper healing and a successful outcome.
Immediate Post-Operative Period:
Hospital Stay: Most patients are able to go home the same day or within 1 to 3 days after surgery, depending on their individual recovery and the extent of the procedure.
Pain Management: You will experience some post-operative pain and discomfort, which will be managed with pain medication. The pain is typically less severe than after open surgery due to the smaller incisions and less muscle disruption.
Early Mobilization: You will be encouraged to get up and walk around as soon as you feel comfortable, often within a few hours after surgery. Light activity helps to prevent blood clots and promotes healing.
Wound Care: You will receive specific instructions on how to care for your small surgical incisions. Keep them clean and dry to prevent infection.
Bracing: Your surgeon may recommend wearing a back brace for a period of time to provide support and stability to your spine during the initial healing phase.
Recovery at Home:
Pain Management: Continue taking pain medication as prescribed and gradually wean off as your pain improves. Over-the-counter pain relievers may be sufficient after the initial few weeks.
Activity Restrictions: You will need to avoid strenuous activities, heavy lifting (typically anything over 10 pounds), twisting, and bending for several weeks to months to allow the fusion to heal properly. Your surgeon will provide specific guidelines based on your individual case.
Walking and Light Exercise: Gradually increase your walking and engage in other light exercises as recommended by our team. This helps to improve circulation, strength, and flexibility.
Physical Therapy: A structured physical therapy program is a crucial part of the recovery process. It will help you regain strength in your back and core muscles, improve flexibility and range of motion, and learn proper body mechanics to prevent future problems. Physical therapy typically starts a 6 weeks after surgery.
Driving: You can usually resume driving once you are no longer taking strong pain medication and can comfortably move without restrictions, typically within a few weeks. However, always consult our team for specific guidance.
Return to Work: The timeline for returning to work depends on the nature of your job and your individual recovery progress. If your job is sedentary, you may be able to return within a few weeks. If it involves heavy lifting or strenuous activity, it may take several months.
Follow-up Appointments: You will have regular follow-up appointments with our team to monitor your healing progress, including assessing the fusion on imaging studies (like X-rays), and address any concerns you may have.
Long-Term Expectations:
Pain Relief and Improved Function: The primary goal of endoscopic lumbar fusion is to provide long-term pain relief and improve your ability to perform daily activities. Most patients experience significant improvement in their symptoms.
Continued Healing: The bone fusion process can take several months to a year or longer. It’s important to continue following our team’s recommendations and maintain a healthy lifestyle to support the fusion.
Lifestyle Modifications: Maintaining a healthy weight, practicing good posture, and using proper lifting techniques are essential for long-term spinal health and to prevent problems in other areas of the spine.
Potential for Adjacent Segment Disease: Over time, the vertebrae above and below the fused segment may experience increased stress and potentially develop problems. This is a potential long-term complication of any spinal fusion surgery.
It’s important to have realistic expectations about the recovery process and to communicate openly with us throughout your journey. We will provide you with personalized instructions and support to help you achieve the best possible outcome.
