What is Failed Back Surgery Syndrome?

Failed back surgery syndrome, also called FBSS, post-laminectomy syndrome, or persistent spinal pain syndrome type 2, refers to persistent, recurrent, or new back pain or leg pain after spine surgery. The term can sound discouraging, but it does not always mean that a surgery was performed incorrectly. It means that pain remains or returns after a prior spine procedure.

FBSS may occur after procedures such as discectomy, laminectomy, decompression, fusion, or other lumbar spine surgery. Symptoms may involve the lower back, buttock, hip, leg, or foot. Pain may be mechanical, nerve-related, or a combination of both.

De Novo Brain & Spine evaluates adult patients with persistent pain after spine surgery to help determine whether symptoms may be related to recurrent nerve compression, spinal stenosis, instability, adjacent segment disease, scar tissue, hardware issues, pseudoarthrosis, or another spine-related condition that may require neurosurgical review.

Common Signs and Symptoms

Failed back surgery syndrome symptoms vary depending on the original condition, prior surgery, current spine anatomy, nerve involvement, and pain source.

Common signs and symptoms may include:

• Persistent low back pain after spine surgery
• Recurrent back pain after a period of improvement
• New back pain that develops after surgery
• Leg pain, buttock pain, hip pain, or sciatica
• Burning, shooting, or electric-like nerve pain
• Numbness or tingling in the leg or foot
• Weakness in the leg, ankle, or foot
• Foot drop or difficulty lifting the front of the foot
• Pain that worsens with standing, walking, bending, lifting, or certain positions
• Limited walking tolerance
• Muscle spasms or stiffness in the lower back
• Difficulty sleeping because of pain
• Reduced ability to work, exercise, or perform daily activities
• Symptoms that are similar to the pain before surgery or different from the original pain

Seek urgent medical evaluation for progressive weakness, foot drop, numbness in the groin or saddle area, new bowel or bladder problems, fever, chills, wound drainage, unexplained weight loss, severe pain after trauma, or rapidly worsening neurological symptoms. Seek emergency medical care or call 911 for symptoms concerning for cauda equina syndrome, including loss of bowel or bladder control, severe leg weakness, or saddle anesthesia.

What Causes This Condition?

Failed back surgery syndrome can have many causes. In some patients, there is one clear structural problem. In others, pain may come from several overlapping factors.

Possible causes and related conditions may include:

• Recurrent disc herniation, when disc material returns or continues to irritate a nerve
• Residual or recurrent spinal stenosis, which is narrowing around the spinal canal or nerve roots
• Foraminal stenosis, which is narrowing where a nerve exits the spine
• Epidural fibrosis, meaning scar tissue around a nerve root after surgery
• Adjacent segment disease, when spinal levels near a prior surgery develop degeneration or instability
• Pseudoarthrosis, meaning lack of solid fusion after a spinal fusion procedure
• Hardware loosening, irritation, failure, or malposition in selected cases
• Spinal instability or abnormal motion after surgery
• Facet joint disease or arthritis-related pain
• Sacroiliac joint pain, which may become more noticeable after lumbar fusion or altered mechanics
• Arachnoiditis, a less common inflammatory condition involving nerve roots
• Infection after surgery in selected cases
• Nerve injury or persistent neuropathic pain
• Myofascial pain, deconditioning, or altered movement patterns
• Pain sensitization, sleep disruption, mood symptoms, or stress-related factors that can make chronic pain harder to manage

These are possible causes or contributors, not guarantees that any one factor is present. Treatment planning depends on symptoms, neurological examination, prior surgical history, imaging findings, pain pattern, response to prior care, and overall health.

How It Is Diagnosed?

Failed back surgery syndrome is diagnosed through careful review of the patient’s symptoms, prior surgery, physical examination, neurological examination, imaging, and additional testing when appropriate. The goal is to identify whether there is a treatable structural cause or whether pain is mainly chronic, neuropathic, mechanical, or mixed.

Common diagnostic steps may include:

• Medical history and symptom review to understand the original diagnosis, prior surgery, timing of pain, current pain pattern, leg symptoms, weakness, numbness, and prior treatment response
• Review of prior operative reports and records to understand what surgery was performed and which spinal levels were treated
• Review of prior imaging to compare preoperative and postoperative findings
• Physical examination to evaluate posture, range of motion, tenderness, spasm, gait, and pain triggers
• Neurological examination to assess strength, sensation, reflexes, coordination, walking, balance, and signs of nerve root involvement
• X-rays of the lumbar spine to evaluate alignment, hardware, fusion changes, degenerative changes, and spinal balance
• Flexion-extension X-rays in selected cases to evaluate abnormal motion or instability
• MRI of the lumbar spine with and without contrast to evaluate recurrent disc herniation, scar tissue, stenosis, nerve compression, infection, tumor, or other soft-tissue findings
• CT scan of the lumbar spine to evaluate bone detail, fusion status, hardware position, fracture, or surgical planning
• CT myelogram in selected cases when MRI is limited by metal artifact or when additional detail around the spinal canal and nerve roots is needed
• Electromyography and nerve conduction studies, also called EMG/NCS, when symptoms may involve radiculopathy, peripheral neuropathy, peroneal neuropathy, or another nerve disorder
• Blood tests in selected cases when infection, inflammation, or another medical condition is suspected
• Diagnostic injections in selected cases when the suspected pain source may involve a nerve root, facet joint, sacroiliac joint, or other structure

The goal of diagnosis is to determine whether there is a specific pain generator, whether revision surgery or another procedure may help, or whether non-surgical pain management and rehabilitation are more appropriate.

Treatment Options

Treatment for failed back surgery syndrome depends on the cause of pain, prior surgery, imaging findings, neurological examination, pain severity, functional limitations, medical history, and patient goals. There is no single treatment that is appropriate for every patient.

Treatment options may include:

• Activity modification to reduce positions, lifting, bending, or movements that worsen symptoms
• Physical therapy to improve strength, mobility, posture, walking mechanics, and spine stability
• Home exercise and conditioning when recommended by a clinician or therapist
• Medication management for pain, inflammation, muscle spasm, or nerve pain when medically appropriate
• Treatment of sleep, mood, and chronic pain factors when these issues contribute to pain experience or function
• Lumbar epidural steroid injection in selected cases involving nerve root inflammation or radiating leg pain
• Selective nerve root block when a specific nerve root may be contributing to symptoms
• Facet joint injection, medial branch block, or radiofrequency ablation in selected cases when facet-mediated pain is suspected
• Sacroiliac joint injection or SI joint treatment in selected cases when the sacroiliac joint is thought to be a pain source
• Spinal cord stimulation, also called SCS, in selected patients with chronic neuropathic back or leg pain after appropriate evaluation and trial stimulation
• Revision decompression surgery in selected cases involving recurrent or persistent nerve compression
• Revision fusion or stabilization in selected cases involving spinal instability, pseudoarthrosis, adjacent segment disease, deformity, or hardware-related problems
• Microdiscectomy or repeat discectomy in selected cases of recurrent disc herniation with nerve compression
• Treatment of infection, fracture, tumor, or other specific structural cause when one is identified
• Multidisciplinary pain management when pain is chronic, complex, or not clearly related to a surgically correctable problem
• Rehabilitation and follow-up care to monitor pain, strength, walking, function, and quality of daily activity

Surgery is not appropriate for every patient with failed back surgery syndrome. Neurosurgical treatment may be considered when there is a clear structural problem, progressive neurological deficit, recurrent nerve compression, instability, pseudoarthrosis, hardware-related concern, or another treatable spine condition.