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Spondylolisthesis<\/strong> occurs when one vertebra slips forward over the one beneath it, most commonly in the lower back. At the L4\u2013L5 level<\/strong>, this slippage can cause back pain<\/strong>, leg pain (sciatica)<\/strong>, and nerve compression<\/strong> that affects walking and daily activities.<\/p>\n When conservative treatments like medication, therapy, or injections fail to provide relief, spinal fusion surgery is often recommended. Modern minimally invasive procedures\u2014such as Extreme Lateral Interbody Fusion (XLIF)<\/strong>\u2014allow surgeons to stabilize the spine through smaller incisions, less muscle disruption, and quicker recovery times.<\/p>\n Degenerative spondylolisthesis is most common in adults over 50 years old<\/strong>, particularly in women. It often results from age-related wear and tear, arthritis, and spinal instability. The L4\u2013L5 segment<\/strong> is the most frequently affected area due to its high mobility and weight-bearing function.<\/p>\n Spondylolisthesis develops when the joints and discs that stabilize the spine weaken, allowing one vertebra to slip forward. Disc degeneration:<\/strong> The intervertebral disc loses height and elasticity.<\/p>\n<\/li>\n Facet joint arthritis:<\/strong> The small joints in the back of the spine wear down.<\/p>\n<\/li>\n Ligament weakening:<\/strong> Supporting ligaments lose strength over time.<\/p>\n<\/li>\n Micro-instability:<\/strong> Repeated strain causes gradual forward slippage.<\/p>\n<\/li>\n<\/ul>\n At the L4\u2013L5 level, these changes can compress the spinal canal and nerves, causing symptoms such as back pain, leg numbness, and difficulty standing or walking.<\/p>\n The lumbar spine consists of five vertebrae (L1\u2013L5), separated by intervertebral discs that act as cushions and allow flexibility. The facet joints<\/strong> stabilize the spine while permitting motion. In spondylolisthesis, the balance between these stabilizing structures is disrupted, resulting in vertebral misalignment and nerve irritation.<\/p>\n Typical symptoms of spondylolisthesis include:<\/p>\n Chronic lower back pain<\/strong><\/p>\n<\/li>\n Pain radiating into one or both legs (sciatica)<\/strong><\/p>\n<\/li>\n Numbness or tingling<\/strong> in the legs or feet<\/p>\n<\/li>\n Weakness<\/strong> or fatigue while walking<\/p>\n<\/li>\n Difficulty standing upright<\/strong><\/p>\n<\/li>\n Pain relief when sitting or bending forward<\/strong> Diagnosis begins with a detailed clinical examination followed by imaging studies:<\/p>\n X-rays:<\/strong> Identify vertebral slippage and help classify the degree of movement.<\/p>\n<\/li>\n MRI:<\/strong> Evaluates soft tissues and nerve compression.<\/p>\n<\/li>\n CT scans:<\/strong> Provide detailed bone images, especially useful for surgical planning.<\/p>\n<\/li>\n Flexion-extension X-rays:<\/strong> Assess spinal instability.<\/p>\n<\/li>\n<\/ul>\n The degree of slippage is measured using the Meyerding classification<\/strong>, ranging from Grade I (mild) to Grade IV (severe).<\/p>\n Spondylolisthesis is categorized by cause and severity:<\/p>\n Degenerative:<\/strong> Age-related wear and tear.<\/p>\n<\/li>\n Isthmic:<\/strong> Due to a small fracture (spondylolysis) in the bone connecting the joints.<\/p>\n<\/li>\n Congenital:<\/strong> Present at birth from spinal malformation.<\/p>\n<\/li>\n Traumatic or pathological:<\/strong> Due to injury, tumor, or bone disease. Grade I: <25% slip<\/p>\n<\/li>\n Grade II: 25\u201350% slip<\/p>\n<\/li>\n Grade III: 50\u201375% slip<\/p>\n<\/li>\n Grade IV: >75% slip<\/p>\n<\/li>\n<\/ul>\n Conditions with similar symptoms include:<\/p>\n Lumbar disc herniation<\/p>\n<\/li>\n Spinal stenosis<\/p>\n<\/li>\n Degenerative disc disease<\/p>\n<\/li>\n Facet joint arthritis<\/p>\n<\/li>\n Piriformis syndrome<\/p>\n<\/li>\n<\/ul>\n Mild cases are initially managed conservatively:<\/p>\n Medications:<\/strong> NSAIDs, pain relievers, or muscle relaxants.<\/p>\n<\/li>\n Physical therapy:<\/strong> Core-strengthening and posture training.<\/p>\n<\/li>\n Epidural steroid injections:<\/strong> Reduce inflammation and nerve irritation.<\/p>\n<\/li>\n Bracing:<\/strong> May help in younger or athletic patients.<\/p>\n<\/li>\n<\/ul>\n If symptoms persist or progress, surgical intervention may be required.<\/p>\n XLIF<\/strong> is a minimally invasive fusion technique performed through the patient\u2019s side rather than the back or abdomen. Making a small incision on the side of the abdomen.<\/p>\n<\/li>\n Using a tubular retractor to access the spine through the psoas muscle<\/strong>.<\/p>\n<\/li>\n Removing the damaged disc and placing a spacer filled with bone graft<\/strong> between the vertebrae.<\/p>\n<\/li>\n Inserting screws and rods for stabilization.<\/p>\n<\/li>\n<\/ol>\n Benefits of XLIF:<\/strong><\/p>\n Smaller incisions and less blood loss.<\/p>\n<\/li>\n Shorter hospital stay (typically 1\u20132 days).<\/p>\n<\/li>\n Faster recovery and less postoperative pain.<\/p>\n<\/li>\n Lower infection risk compared to open fusion.<\/p>\n<\/li>\n<\/ul>\n Immediate postoperative period:<\/strong> Most patients walk within 24 hours.<\/p>\n<\/li>\n Hospital stay:<\/strong> Usually 1\u20132 days.<\/p>\n<\/li>\n Return to activity:<\/strong> Light activity within weeks; full recovery in 3\u20136 months.<\/p>\n<\/li>\n Physical therapy:<\/strong> Begins early to improve strength and flexibility.<\/p>\n<\/li>\n<\/ul>\n Most patients report significant pain relief and improved stability within weeks.<\/p>\n Potential risks include:<\/p>\n Thigh numbness or hip flexor weakness:<\/strong> Usually temporary from psoas muscle retraction.<\/p>\n<\/li>\n Nerve irritation:<\/strong> Rare with real-time monitoring.<\/p>\n<\/li>\n Infection or bleeding:<\/strong> Very uncommon with minimally invasive techniques.<\/p>\n<\/li>\n Non-union (failed fusion):<\/strong> Occurs rarely if bone healing is incomplete.<\/p>\n<\/li>\n<\/ul>\n Studies show excellent outcomes for patients undergoing XLIF for L4\u2013L5 spondylolisthesis.<\/p>\n Over 90%<\/strong> of patients experience lasting pain relief.<\/p>\n<\/li>\n Radiographic imaging after one year typically shows solid fusion<\/strong> with restored alignment.<\/p>\n<\/li>\n Age, BMI, or previous surgeries do not significantly affect success rates.<\/p>\n<\/li>\n<\/ul>\n Medicare<\/p>\n CPT Code 22558 \u2013 Extreme Lateral Interbody Fusion (XLIF): $368.50<\/p>\n Under Medicare, 80% of the approved cost for this spinal fusion procedure is covered once the annual deductible has been met. The remaining 20% is typically the patient\u2019s responsibility. Supplemental insurance plans\u2014such as Medigap, AARP, or Blue Cross Blue Shield\u2014generally cover this 20%, leaving most patients with little or no out-of-pocket expenses for Medicare-approved spinal surgeries. These supplemental policies work directly with Medicare to provide comprehensive coverage for advanced fusion techniques such as XLIF.<\/p>\n If you have secondary insurance\u2014such as Employer-Based Plans, TRICARE, or Veterans Health Administration (VHA)\u2014it serves as a secondary payer once Medicare has processed your claim. After your deductible is satisfied, these plans often cover remaining coinsurance or balance due. Secondary plans typically have a modest deductible, usually between $100 and $300, depending on your policy and provider network.<\/p>\n Workers\u2019 Compensation<\/strong> No-Fault Insurance<\/strong> Example Q. What is XLIF surgery?<\/strong> Q. Why is XLIF preferred for L4\u2013L5 spondylolisthesis?<\/strong> Q. How long is recovery after XLIF?<\/strong> Q. Is XLIF safe?<\/strong> Spondylolisthesis at L4\u2013L5<\/strong> is a common cause of lower back and leg pain due to vertebral slippage. When conservative care fails, Extreme Lateral Interbody Fusion (XLIF)<\/strong> provides a minimally invasive, safe, and effective solution. It offers excellent pain relief, restores spinal alignment, and helps patients return quickly to active lifestyles with fewer complications and shorter hospital stays than traditional open surgery.<\/p>\n Treatment is provided by orthopedic spine surgeons<\/strong> or neurosurgeons<\/strong> experienced in minimally invasive fusion techniques, supported by anesthesiologists<\/strong>, neuromonitoring technicians<\/strong>, and rehabilitation specialists<\/strong>.<\/p>\n You should see a spine specialist if you experience:<\/p>\n Persistent low back or leg pain despite therapy or medication.<\/p>\n<\/li>\n Numbness, tingling, or weakness in your legs.<\/p>\n<\/li>\n Difficulty walking or standing upright.<\/p>\n<\/li>\n Worsening spinal instability seen on imaging.<\/p>\n<\/li>\n<\/ul>\n Seek immediate medical attention if you develop:<\/p>\n Sudden loss of bladder or bowel control.<\/p>\n<\/li>\n Severe or worsening leg weakness.<\/p>\n<\/li>\n Numbness in the groin or saddle area (possible cauda equina syndrome).<\/p>\n<\/li>\n<\/ul>\n After XLIF, patients typically walk the same day or next. Initial soreness resolves within days, and significant improvement in back and leg pain is common by the first follow-up visit. Physical therapy supports posture correction and long-term spinal health.<\/p>\n Untreated spondylolisthesis can lead to chronic pain, progressive slippage, or permanent nerve damage. Early evaluation and treatment prevent long-term disability and improve quality of life.<\/p>\n Strengthen core and back muscles regularly.<\/p>\n<\/li>\n Maintain proper posture and lifting technique.<\/p>\n<\/li>\n Avoid repetitive spinal strain or high-impact activities.<\/p>\n<\/li>\n Address back pain early to prevent worsening instability.<\/p>\n<\/li>\n<\/ul>\n A diet rich in calcium<\/strong>, vitamin D<\/strong>, and protein<\/strong> promotes bone fusion and healing after surgery. Avoid smoking, as it slows bone growth and impairs recovery.<\/p>\n After recovery, engage in low-impact exercises<\/strong> like walking, swimming, or yoga to maintain flexibility. Use ergonomic seating and avoid prolonged sitting or heavy lifting.<\/p>\n [\/et_pb_text][et_pb_text admin_label=”FAQ Headline” _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_df_faq admin_label=”FAQ Module – Change the FAQ Category Here” filter_by_category_on=”on” accordion_bg_color_closed=”#1f7714″ accordion_bg_color_open=”#1f7714″ accordion_icon_color=”#FFFFFF” accordion_icon_color_open=”#FFFFFF” _builder_version=”4.27.0″ _module_preset=”default” question_text_color=”#FFFFFF” answer_text_color=”#FFFFFF” hover_enabled=”0″ global_colors_info=”{}” include_categories=”5482″ sticky_enabled=”0″]<\/p>\n [\/et_pb_df_faq][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_sidebar area=”sidebar-1″ _builder_version=”4.16″ global_colors_info=”{}”]<\/p>\n [\/et_pb_sidebar][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" Grade 2 Spondylolisthesis at L4-5 treated by XLIF One of the most frequent reasons for spinal surgery is still spondylolisthesis. Patients with degenerative spondylolisthesis are often advised to undergo fusion.<\/p> Although the advantages of surgical treatment compared to non-surgical care for this condition have been demonstrated in the long run, it is only in recent high-quality data that the cost-effectiveness of this procedure has been established.<\/p> Modern developments in minimally invasive surgical technology are currently being utilized to treat spinal conditions. An approach known as extreme lateral interbody fusion (XLIF) has been proposed as a secure and minimally invasive substitute for conventional open fusion surgeries.<\/p> Although XLIF has been suggested for treating spondylolisthesis up to grade 2, the potential risk of neural complications associated with lateral approaches to the spine raises concerns about its safety. The concerns are particularly significant at the L4-5 level because the lumbar plexus is located most ventrally in that region. The risk is further aggravated in the presence of marked anterolisthesis at this level.<\/p> On average, patients experience a hospital stay of 1.2 days, and their hemoglobin levels decrease by 1.4 g. Transient pain in the upper thigh and weakness in hip flexion can be expected shortly after surgery due to trauma to the psoas muscle.<\/p> Grade II spondylolisthesis is most frequently observed at the L4-5 level, although single level presentations at L2-3 and L3-4 are also identified. Although the composition of biologic materials may differ, the majority of them contain demineralized bone matrices. While transpedicular fixation is the primary method utilized for treating grade II spondylolisthesis, transpedicular facet fixation is also a viable option.<\/p> According to literature, dynamic radiographs show no signs of radiographic instability after 12 months, and all patients appear to have bone growth spanning the interbody space. Age, BMI\/obesity, preexisting comorbidities, previous surgery, number of levels treated, or unilateral versus bilateral fixation do not appear to affect radiographic improvement, slip reduction, or maintenance of improvements in VAS at the last follow-up.<\/p> The patient's satisfaction and willingness to undergo the procedure again are contingent on the extent of slip improvement.Based on available literature, while the average correction is well-preserved, 6.4% of patients experience a loss of more than 3 mm in listhetic correction and 6.4% experience a loss of more than 3 mm in disk height. Most patients consider themselves either \"satisfied\" or \"very satisfied\" with the outcomes of the procedure, and nearly 100% of them express their willingness to undergo the same procedure again.<\/p> The literature has reported the application of XLIF in treating degenerative spinal conditions, along with its comparatively lower incidence of complications when compared to traditional open approaches, be it anterior or posterior. The procedure results in a remarkable reduction in listhetic deformity and improvement in disk height, which are sustained over time.<\/p> The clinical outcomes show a significant improvement in VAS, which is consistently maintained up to one year. Clinical measurements demonstrate the alleviation of stenotic symptoms due to the indirect decompression and stabilization achieved through the procedure.<\/p> Literature reports indicate an occurrence of groin numbness (without motor deficits) when using an endoscopic transpsoas approach without neurological monitoring. There is a lot of debate around the neurological deficits linked to lateral approaches.<\/p> The L4-5 level poses the highest risk for the lumbar plexus in a transpsoas approach, as per the anatomical and radiographic documentation. Furthermore, the plexus is placed at even greater risk with anterolisthesis of the superior vertebral body, as it is pushed even more ventrally, further increasing safety concerns.<\/p> Nevertheless, if proper attention is given to the technique details mentioned above, and real-time neurologic monitoring is conducted, successful treatment of grade 2 spondylolisthesis segments, particularly at L4-5, can be achieved without any neurologic damage.<\/p> Surgery has been demonstrated in large randomized trials to result in better patient outcomes than nonoperative treatment for spondylolisthesis. Various techniques have been utilized to treat spondylolisthesis, including decompression alone, instrumented PLF, PLIF, ALIF, TLIF, as well as minimally invasive procedures like MIS ALIF or MIS TLIF.<\/p> However, there is no clear consensus on which technique is the best. Substantially cost-effective compared to conservative care, instrumented fusion for the treatment of degenerative spondylolisthesis has been demonstrated to be clinically effective. MIS XLIF fusion for spondylolisthesis is associated with significantly fewer complications compared to traditional open approaches, according to the reported literature. Additionally, traditional open spinal fusions have been reported to result in much longer hospital stays.<\/p> The use of XLIF has been demonstrated to be a secure and efficient method to manage grade 2 spondylolisthesis specifically at the L4-5 level. This technique leads to significant clinical and radiographic improvement that is sustained over a period of time. Real-time neurologic monitoring and meticulous technique are essential.<\/p>","_et_gb_content_width":"","footnotes":""},"class_list":["post-24778","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/pages\/24778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=24778"}],"version-history":[{"count":8,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/pages\/24778\/revisions"}],"predecessor-version":[{"id":59122,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/pages\/24778\/revisions\/59122"}],"up":[{"embeddable":true,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/pages\/2471"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=\/wp\/v2\/media\/15514"}],"wp:attachment":[{"href":"https:\/\/2025divi.cortho.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}How Common It Is and Who Gets It? (Epidemiology)<\/h3>\n
Why It Happens \u2013 Causes (Etiology and Pathophysiology)<\/h3>\n
Common contributing factors include:<\/p>\n\n
How the Body Part Normally Works? (Relevant Anatomy)<\/h3>\n
What You Might Feel \u2013 Symptoms (Clinical Presentation)<\/h3>\n
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In severe cases, nerve compression may cause loss of bladder or bowel control<\/strong> (cauda equina syndrome), which requires immediate medical attention.<\/p>\n<\/li>\n<\/ul>\nHow Doctors Find the Problem? (Diagnosis and Imaging)<\/h3>\n
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Classification<\/h3>\n
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By grade:<\/p>\n<\/li>\nOther Problems That Can Feel Similar (Differential Diagnosis)<\/h3>\n
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Treatment Options<\/h3>\n
Non-Surgical Care<\/h4>\n
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Surgical Care \u2013 Extreme Lateral Interbody Fusion (XLIF)<\/h4>\n
Steps of the procedure include:<\/strong><\/p>\n\n
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Recovery and What to Expect After Treatment<\/h3>\n
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Possible Risks or Side Effects (Complications)<\/h3>\n
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Long-Term Outlook (Prognosis)<\/h3>\n
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Out-of-Pocket Cost<\/h3>\n
If your spinal condition requiring XLIF surgery resulted from a workplace injury or repetitive stress, Workers\u2019 Compensation will cover the entire cost of the procedure, including hospital care, instrumentation, and rehabilitation. You will not have any out-of-pocket expenses under an approved Workers\u2019 Compensation claim.<\/p>\n
If your spinal condition was caused or worsened by a motor vehicle accident, No-Fault Insurance will pay all medical and surgical costs associated with your XLIF procedure. The only potential patient cost may be a small deductible depending on your policy\u2019s terms.<\/p>\n
Andrea, a 66-year-old patient with degenerative disc disease and spinal instability, underwent an extreme lateral interbody fusion (CPT 22558) to restore spinal alignment and relieve nerve compression. Her estimated Medicare out-of-pocket cost was $368.50. Because she had supplemental insurance through Medigap, the remaining 20% that Medicare did not cover was fully paid, leaving her with no out-of-pocket expense for the surgery.<\/p>\nFrequently Asked Questions (FAQ)<\/h3>\n
A. XLIF (Extreme Lateral Interbody Fusion) is a minimally invasive spinal fusion performed through the patient\u2019s side rather than the back, minimizing muscle damage and speeding recovery.<\/p>\n
A. XLIF allows excellent access to the disc space while avoiding major back muscles. It provides strong stabilization with less postoperative pain and shorter hospital stays.<\/p>\n
A. Most patients return to light activity within 4\u20136 weeks and resume normal routines within 3\u20136 months.<\/p>\n
A. Yes. With careful technique and real-time nerve monitoring, XLIF is a safe and effective procedure for grades I\u2013II spondylolisthesis, especially at the L4\u2013L5 level.<\/p>\nSummary and Takeaway<\/h3>\n
Who Performs This Treatment? (Specialists and Team Involved)<\/h3>\n
When to See a Specialist?<\/h3>\n
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When to Go to the Emergency Room?<\/h3>\n
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What Recovery Really Looks Like?<\/h3>\n
What Happens If You Ignore It?<\/h3>\n
How to Prevent It?<\/h3>\n
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Nutrition and Bone or Joint Health<\/h3>\n
Activity and Lifestyle Modifications<\/h3>\n
Do you have more questions?\u00a0<\/h2>\n
Complications<\/h2>