While some facet cysts cause no symptoms, others can lead to spinal canal narrowing (stenosis)<\/strong> and significant discomfort.<\/p>\n
How Common It Is and Who Gets It? (Epidemiology)<\/h3>\n
Synovial facet cysts are uncommon but typically occur in older adults (over 50 years)<\/strong> due to arthritis and wear-and-tear changes in the spine. They are most frequently found at the L4\u2013L5 level<\/strong>, where motion and degeneration are greatest. Both men and women are equally affected.<\/p>\n MRI axial section showing the facet joint.<\/p><\/div>\n Facet joints connect the vertebrae at the back of the spine and allow for smooth movement. They are surrounded by a capsule that produces synovial fluid<\/strong>\u2014a lubricant that helps the joints move easily. Intervertebral discs lose height<\/strong>, putting more stress on facet joints.<\/p>\n<\/li>\n Facet arthritis<\/strong> develops, leading to inflammation and joint instability.<\/p>\n<\/li>\n The capsule may produce excess synovial fluid, which can form a pocket or cyst<\/strong>. The facet joints<\/strong> are located behind each vertebra and guide motion in the spine. Each joint has smooth cartilage and is enclosed by a capsule filled with synovial fluid for lubrication. Symptoms depend on the cyst\u2019s size and location:<\/p>\n Lower back pain<\/strong>\u2014often worse with standing or walking.<\/p>\n<\/li>\n Leg pain (sciatica):<\/strong> Radiating pain from the lower back into one or both legs.<\/p>\n<\/li>\n Numbness or tingling<\/strong> in the legs or feet.<\/p>\n<\/li>\n Weakness<\/strong> in the legs if the cyst compresses nerve roots.<\/p>\n<\/li>\n Neurogenic claudication:<\/strong> Pain in the buttocks and legs that worsens with walking and improves when sitting or bending forward.<\/p>\n<\/li>\n Sudden worsening of pain<\/strong> if bleeding occurs inside the cyst.<\/p>\n<\/li>\n<\/ul>\n Symptoms are often similar to spinal stenosis or a herniated disc.<\/p>\n Diagnosis begins with a physical exam and neurological assessment.<\/p>\n MRI:<\/strong> The gold standard imaging test for detecting facet cysts and evaluating nerve compression.<\/p>\n<\/li>\n CT scan:<\/strong> May be used for detailed bone structure evaluation or to guide injections.<\/p>\n<\/li>\n X-rays:<\/strong> Can show degenerative changes or joint instability. Synovial facet cysts are classified by their location and associated findings<\/strong>:<\/p>\n Lumbar cysts:<\/strong> Most common (especially L4\u2013L5).<\/p>\n<\/li>\n Cervical or thoracic cysts:<\/strong> Rare.<\/p>\n<\/li>\n With or without nerve compression:<\/strong> Symptomatic (compressive) or asymptomatic (non-compressive).<\/p>\n<\/li>\n<\/ul>\n Conditions that may mimic facet cyst symptoms include:<\/p>\n Lumbar disc herniation<\/p>\n<\/li>\n Spinal stenosis<\/p>\n<\/li>\n Degenerative spondylolisthesis<\/p>\n<\/li>\n Epidural hematoma or abscess<\/p>\n<\/li>\n Tumors of the spine<\/p>\n<\/li>\n<\/ul>\n Most patients start with conservative management:<\/p>\n Medications:<\/strong> Nonsteroidal anti-inflammatory drugs (NSAIDs) reduce pain and inflammation.<\/p>\n<\/li>\n Physical therapy:<\/strong> Strengthening and flexibility exercises improve stability and relieve pressure.<\/p>\n<\/li>\n Heat or cold therapy:<\/strong> Helps reduce stiffness and discomfort.<\/p>\n<\/li>\n Epidural steroid injections:<\/strong> Can temporarily reduce inflammation and pain.<\/p>\n<\/li>\n CT-guided cyst rupture with steroid injection:<\/strong> Involves breaking the cyst and injecting anti-inflammatory medication to relieve nerve compression. Some patients may need repeat injections.<\/p>\n<\/li>\n<\/ul>\n Surgery is considered when symptoms persist despite conservative treatment or neurological deficits develop. Laminectomy and decompression:<\/strong> Removes part of the bone and facet joint to relieve nerve pressure and remove the cyst. Usually done for one-sided (unilateral) symptoms.<\/p>\n<\/li>\n Facetectomy with fusion:<\/strong> Involves removing part or all of the facet joint and stabilizing the spine with screws and rods. Indicated for:<\/p>\n Bilateral or recurrent cysts<\/p>\n<\/li>\n Central spinal canal stenosis<\/p>\n<\/li>\n Instability of the vertebrae<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n Minimally invasive techniques allow smaller incisions, faster recovery, and less tissue disruption.<\/p>\n Conservative management:<\/strong> Improvement may occur over several weeks or months.<\/p>\n<\/li>\n After surgery:<\/strong> Most patients experience immediate relief of leg pain. Hospital stays are typically 1\u20132 days for minimally invasive surgery.<\/p>\n<\/li>\n Rehabilitation:<\/strong> Physical therapy begins soon after surgery to restore movement and strengthen the back. Potential risks include:<\/p>\n Recurrence of the cyst<\/p>\n<\/li>\n Nerve injury or persistent pain<\/p>\n<\/li>\n Infection or bleeding<\/p>\n<\/li>\n Spinal instability (may require fusion)<\/p>\n<\/li>\n Cerebrospinal fluid (CSF) leak<\/p>\n<\/li>\n<\/ul>\n The long-term outlook is excellent. Most patients achieve lasting pain relief and improved mobility after treatment. The recurrence rate after surgery is very low, especially when spinal stabilization is performed. Early diagnosis and treatment prevent chronic nerve compression.<\/p>\n Medicare<\/p>\n CPT Code 63047 \u2013 Decompression \/ Laminectomy with Cyst Excision: $271.76 Under Medicare, 80% of the approved costs for these spine procedures are covered once your annual deductible has been met. Patients are responsible for the remaining 20%. Supplemental insurance plans\u2014such as Medigap, AARP, or Blue Cross Blue Shield\u2014usually pay this 20% portion, meaning most patients have little to no out-of-pocket costs for Medicare-approved surgeries. These supplemental policies work directly with Medicare to ensure comprehensive coverage for spinal decompression and stabilization procedures like laminectomy, cyst excision, and fusion.<\/p>\n If you have secondary insurance\u2014such as Employer-Based coverage, TRICARE, or Veterans Health Administration (VHA)\u2014it serves as a secondary payer once Medicare has processed the claim. After your deductible is met, the secondary plan may cover remaining coinsurance or additional costs. Secondary insurance plans typically have a modest deductible, ranging from $100 to $300 depending on the specific policy and network coverage.<\/p>\n Workers\u2019 Compensation<\/strong> No-Fault Insurance<\/strong> Example Q. What causes a synovial facet cyst?<\/strong> Q. How is a synovial facet cyst different from a herniated disc?<\/strong> Q. Can facet cysts go away on their own?<\/strong> Q. When is surgery necessary?<\/strong> A synovial facet cyst<\/strong> is a fluid-filled sac that forms due to arthritis and degeneration in the spine\u2019s facet joints. While many cases improve with medications, therapy, or injections, surgery provides lasting relief for persistent or severe symptoms. Modern minimally invasive techniques make surgical removal safe, effective, and associated with rapid recovery.<\/p>\n A recent case report described a 64-year-old woman with lumbar synovial facet cyst at the L4\u2013L5 level presenting with neurogenic claudication and radicular pain after prior hip arthroplasty. MRI revealed an extradural cyst compressing the right L5 nerve root and narrowing the spinal canal.<\/p>\n The patient underwent posterior laminectomy, partial arthrectomy, cyst excision, and instrumented posterolateral fusion, which led to significant improvement in walking ability and only mild residual back pain two years post-surgery. The authors emphasized that lumbar facet synovial cysts, most commonly found at L4\u2013L5 due to high mobility and facet degeneration, can mimic hip or spinal stenosis symptoms, complicating diagnosis. MRI remains the gold standard, showing well-defined, smooth, extradural lesions adjacent to facet joints.<\/p>\n While conservative management with analgesics, corticosteroid injections, or cyst aspiration may offer temporary relief, surgical excision combined with fusion provides the best long-term outcomes by addressing both neural compression and underlying spinal instability, thereby minimizing recurrence risk. (Study of surgical management of lumbar synovial facet cyst \u2013 See PubMed<\/em><\/a>.)<\/p>\n Treatment is provided by orthopedic spine surgeons<\/strong> or neurosurgeons<\/strong>, often working with pain management specialists<\/strong>, radiologists<\/strong>, and physical therapists<\/strong>.<\/p>\n Consult a spine specialist if you experience:<\/p>\n Persistent back or leg pain<\/p>\n<\/li>\n Numbness or weakness in the legs<\/p>\n<\/li>\n Pain that worsens while standing or walking<\/p>\n<\/li>\n<\/ul>\n Seek immediate care if you develop:<\/p>\n Loss of bladder or bowel control<\/p>\n<\/li>\n Severe leg weakness or numbness<\/p>\n<\/li>\n Sudden worsening of pain after a fall or injury<\/p>\n<\/li>\n<\/ul>\n After surgery, most patients experience immediate improvement in leg pain and mobility. Physical therapy helps strengthen the back and prevent recurrence. Return to normal activity is typically possible within 4\u20138 weeks.<\/p>\n Ignoring a symptomatic facet cyst may lead to chronic pain, nerve damage, or worsening spinal stenosis. Early diagnosis and treatment improve outcomes.<\/p>\n Maintain good posture and spinal alignment.<\/p>\n<\/li>\n Exercise regularly to strengthen core and back muscles.<\/p>\n<\/li>\n Avoid repetitive twisting or heavy lifting.<\/p>\n<\/li>\n Manage arthritis and maintain a healthy weight.<\/p>\n<\/li>\n<\/ul>\n A diet rich in calcium<\/strong>, vitamin D<\/strong>, and omega-3 fatty acids<\/strong> supports bone health and reduces inflammation. Staying hydrated keeps spinal joints lubricated.<\/p>\n Engage in low-impact exercises such as swimming, yoga, or walking. Avoid high-impact activities that strain the back. Regular stretching maintains flexibility and reduces stress on the facet joints.<\/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″ _builder_version=”4.27.0″ _module_preset=”default” question_text_color=”#ffffff” answer_text_color=”#ffffff” hover_enabled=”0″ global_colors_info=”{}” accordion_icon_color=”#FFFFFF” accordion_icon_color_open=”#FFFFFF” sticky_enabled=”0″ display_title=”off” section_wrapper=”off” enable_search=”off” include_categories=”5555″ enable_groups=”off” display_cat_title=”off” background_pattern_color=”rgba(0,0,0,0.2)” background_mask_color=”#ffffff” main_title_font_size_tablet=”51″ main_title_line_height_tablet=”2″ main_title_text_shadow_horizontal_length=”main_title_text_shadow_style,%91object Object%93″ main_title_text_shadow_horizontal_length_tablet=”0px” main_title_text_shadow_vertical_length=”main_title_text_shadow_style,%91object Object%93″ main_title_text_shadow_vertical_length_tablet=”0px” main_title_text_shadow_blur_strength=”main_title_text_shadow_style,%91object Object%93″ main_title_text_shadow_blur_strength_tablet=”1px” category_title_font_size_tablet=”51″ category_title_line_height_tablet=”2″ category_title_text_shadow_horizontal_length=”category_title_text_shadow_style,%91object Object%93″ category_title_text_shadow_horizontal_length_tablet=”0px” category_title_text_shadow_vertical_length=”category_title_text_shadow_style,%91object Object%93″ category_title_text_shadow_vertical_length_tablet=”0px” category_title_text_shadow_blur_strength=”category_title_text_shadow_style,%91object Object%93″ category_title_text_shadow_blur_strength_tablet=”1px” question_font_size_tablet=”51″ question_line_height_tablet=”2″ question_text_shadow_horizontal_length=”question_text_shadow_style,%91object Object%93″ question_text_shadow_horizontal_length_tablet=”0px” question_text_shadow_vertical_length=”question_text_shadow_style,%91object Object%93″ question_text_shadow_vertical_length_tablet=”0px” question_text_shadow_blur_strength=”question_text_shadow_style,%91object Object%93″ question_text_shadow_blur_strength_tablet=”1px” answer_font_size_tablet=”51″ answer_line_height_tablet=”2″ answer_text_shadow_horizontal_length=”answer_text_shadow_style,%91object Object%93″ answer_text_shadow_horizontal_length_tablet=”0px” answer_text_shadow_vertical_length=”answer_text_shadow_style,%91object Object%93″ answer_text_shadow_vertical_length_tablet=”0px” answer_text_shadow_blur_strength=”answer_text_shadow_style,%91object Object%93″ answer_text_shadow_blur_strength_tablet=”1px” search_button_text_shadow_horizontal_length=”search_button_text_shadow_style,%91object Object%93″ search_button_text_shadow_horizontal_length_tablet=”0px” search_button_text_shadow_vertical_length=”search_button_text_shadow_style,%91object Object%93″ search_button_text_shadow_vertical_length_tablet=”0px” search_button_text_shadow_blur_strength=”search_button_text_shadow_style,%91object Object%93″ search_button_text_shadow_blur_strength_tablet=”1px” box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px” vertical_offset_tablet=”0″ horizontal_offset_tablet=”0″ z_index_tablet=”0″ \/][\/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=”{}” \/][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" Synovial Facet Cyst A synovial facet cyst is a small, fluid-filled sac that forms in the facet joint of the spine\u2014most often in the lower back (lumbar region). These cysts develop due to degenerative changes in the spine and may compress nearby nerves, causing lower back pain and radiating leg pain (sciatica).While some facet cysts […]<\/p>\n","protected":false},"author":37,"featured_media":12030,"parent":57462,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"Synovial Facet Cyst - Complete Orthopedics & Podiatry","_seopress_titles_desc":"A synovial facet cyst is a fluid-filled sac originating in the facet joint of the spine. The fluid-filled sac is most commonly found in the lower spine (lumbar spine).","_seopress_robots_index":"","_et_pb_use_builder":"on","_et_pb_old_content":" A synovial facet cyst is a fluid-filled sac originating in the facet joint of the spine. The fluid-filled sac is most commonly found in the lower spine (lumbar spine). Although most synovial facet cysts may not cause any symptoms, they may compress the nerve roots and cause radiating leg pain. The condition is a result of degenerative changes in the lower spine<\/a>.<\/p> The facet joints are present above and below each vertebra. They are formed where the superior and the inferior articulating facets of the adjoining vertebrae meet. A synovial joint is a joint consisting of a tight fluid-filled capsule. The synovial fluid is generated by the capsule\u2019s inner lining, which lubricates and nourishes the facet joint.<\/p>[caption id=\"attachment_12030\" align=\"aligncenter\" width=\"320\"] With growing age, there may be degenerative changes in the spinal column<\/a>. The water content of the intervertebral disc may decrease which may lead to decreased disk height. The loss of height of the disk leads to degeneration and instability of the facet joint, known as facet joint syndrome<\/a>. The bones forming the joint may rub against each other, causing pain in the lower back.<\/p> The synovial fluid formation is increased by the body to help lubricate the facet joint. At times, the extra fluid may get caught in the lining of the capsule and form a fluid-filled sac. The fluid-filled sac may encroach upon the precarious space in the neural foramen and cause pressure symptoms such as spinal canal stenosis<\/a>.<\/p> The fluid buildup in the cyst occurs slowly but may happen fast if there is bleeding inside the cyst (facet cyst hematoma). The majority of the facet cyst formation occurs in the L4-L5 spinal level.<\/p> The patients may complain of low back pain<\/a>. The back pain may be associated with radiating leg pain. At times, patients may complain of feeling numbness and tingling sensation in the legs. The symptoms may progress suddenly in the case of synovial facet hematoma.<\/p> Neurogenic claudication may occur in patients with synovial facet cyst. The patients may complain of pain in the buttocks and the legs, which is worse on walking. The pain is relieved at rest by bending forward. The space in the neural foramen is reduced on bending backward and standing. The effect is exacerbated with a synovial facet cyst encroaching the space.<\/p> The diagnosis is made on an MRI with clinical examination eliciting nerve root defects. The physician may perform a thorough neurological test to look for the nerves\u2019 motor and sensory function. The synovial facet cyst is visible on MRI as an MRI is able to differentiate between various soft tissue structures.<\/p> The management of synovial facet cyst is mainly conservative. The conservative management consists of nonsteroidal anti-inflammatory medications to relieve pain and inflammation. Physical therapy is initiated to improve muscle strength and flexibility. Heat and cold therapy<\/a> may help relieve the pain and stiffness in some patients.<\/p> Epidural injections may also help in the temporary control of pain. In patients where the symptoms clearly correlate with the synovial facet cyst, a CT guided cyst rupture and cyst steroid injection may be done. Repeat injections may be required in some patients.<\/p> Operative management is indicated in patients with persistent symptoms despite conservative management. Surgical management may be done in the form of lumbar laminectomy and decompression<\/a>. The surgery consists of creating an opening in the lamina and the facet joint to take out the cyst. Laminectomy and decompression surgery are generally done in patients with unilateral symptoms.<\/p>![\"MRI](\"https:\/\/2025divi.cortho.org\/wp-content\/uploads\/2021\/02\/Synovial-Facet-Cyst.jpg\" "\\"MRI")
Why It Happens \u2013 Causes (Etiology and Pathophysiology)<\/h3>\n
With aging and degeneration:<\/p>\n\n
This cyst may press on nearby nerve roots<\/strong> or the spinal canal<\/strong>, causing pain and neurological symptoms.
Occasionally, bleeding into the cyst (facet cyst hematoma)<\/strong> causes rapid symptom worsening.<\/p>\n<\/li>\n<\/ul>\nHow the Body Part Normally Works? (Relevant Anatomy)<\/h3>\n
When degeneration occurs, the capsule may weaken, bulge, and form a cyst. This cyst can intrude into the spinal canal, reducing the space available for nerves.<\/p>\nWhat You Might Feel \u2013 Symptoms (Clinical Presentation)<\/h3>\n
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How Doctors Find the Problem? (Diagnosis and Imaging)<\/h3>\n
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A facet cyst appears on MRI as a fluid-filled mass<\/strong> near a degenerated facet joint.<\/p>\n<\/li>\n<\/ul>\nClassification<\/h3>\n
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Other 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<\/h4>\n
Surgical options include:<\/p>\n\n
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Recovery and What to Expect After Treatment<\/h3>\n
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Full recovery usually occurs within 4\u20138 weeks.<\/p>\n<\/li>\n<\/ul>\nPossible Risks or Side Effects (Complications)<\/h3>\n
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Long-Term Outlook (Prognosis)<\/h3>\n
Out-of-Pocket Costs<\/h3>\n
CPT Code 63005 \u2013 Limited Facet Cyst Excision: $300.40
CPT Code 22612 \u2013 Fusion (if needed): $382.85
CPT Code 22842 \u2013 Instrumentation (Rods, Screws, Plates \u2013 3\u20136 Segments): $185.26<\/p>\n
If your lumbar facet cyst or spinal compression resulted from a workplace injury, Workers\u2019 Compensation will cover the full cost of surgical treatment, including decompression, cyst excision, and spinal fusion if necessary. You will have no out-of-pocket expenses under an accepted Workers\u2019 Compensation claim.<\/p>\n
If your spinal condition or facet cyst was caused or worsened by a motor vehicle accident, No-Fault Insurance will pay for all related surgical and hospital expenses, including decompression, cyst excision, and fusion procedures. The only possible cost to you may be a small deductible depending on your policy\u2019s terms.<\/p>\n
Patricia, a 62-year-old patient with lumbar spinal stenosis and a facet joint cyst, underwent decompression with cyst excision (CPT 63047) and posterior fusion with instrumentation (CPT 22612 + 22842) to stabilize her spine. Her Medicare out-of-pocket costs were $271.76, $382.85, and $185.26, respectively. Since she had supplemental coverage through AARP Medigap, the 20% that Medicare did not pay was fully covered, leaving her with no out-of-pocket expense for her surgery.<\/p>\nFrequently Asked Questions (FAQ)<\/h3>\n
A. It develops from degenerative arthritis in the facet joints, which produces excess synovial fluid that collects and forms a cyst.<\/p>\n
A. Both can compress nerves and cause sciatica, but a facet cyst arises from a joint, while a herniated disc comes from the intervertebral disc.<\/p>\n
A. Small cysts sometimes shrink or rupture naturally, but most persist or enlarge over time.<\/p>\n
A. Surgery is recommended for persistent pain, neurological symptoms, or spinal instability after conservative treatment fails.<\/p>\nSummary and Takeaway<\/h3>\n
Clinical Insight & Recent Findings<\/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
<\/a> MRI axial section showing the facet joint.[\/caption]