Facet Joint Syndrome: Symptoms and Treatment

Facet joint syndrome

Facet joint syndrome (or facet syndrome) is a frequent and often underestimated cause of spinal pain. The facet joints — small synovial joints located in the posterior part of the spine — are responsible for 15-45% of chronic low back pain, 36-67% of neck pain, and 34-48% of thoracic back pain. Despite this high prevalence, facet syndrome is still frequently confused with disc herniation or non-specific low back pain.

Correct diagnosis is fundamental because the treatment of facet syndrome — based on manual therapy, specific exercises, and, in resistant cases, infiltrative procedures — is very different from that of other causes of spinal pain.

Table of Contents

• Anatomy of the Facet Joints
• Causes of Facet Syndrome
• Risk Factors
• Symptoms
• Diagnosis
• Conservative Treatment
• Infiltrative Procedures
• Prognosis
• Frequently Asked Questions (FAQ)
• Frequently Asked Questions
• Sources and Scientific References

Anatomy of the Facet Joints

Structure

The facet joints (or zygapophyseal joints) are paired synovial joints, present at every vertebral level from the cervical to the sacrum. Each vertebra has two superior and two inferior facets, which articulate with the facets of the adjacent vertebra.

Each facet is composed of:

• Articular surfaces covered with hyaline cartilage (2-4 mm thick)
• Fibrous articular capsule, rich in nociceptive nerve endings
• Synovial membrane that produces lubricating synovial fluid
• Meniscoids: small fibro-adipose synovial folds that interpose between the articular surfaces and facilitate gliding

Biomechanical Function

Facet joints have three main functions:

• Guide movement: the orientation of the facets determines the planes of movement allowed at each vertebral level
• Transmit loads: they support 10-20% of axial loads in a neutral position, up to 30-40% in extension
• Limit excessive movements: they protect the disc and spinal cord from excessive rotations and translations

Innervation

Each facet is innervated by the medial branch of the dorsal ramus of the spinal nerve — each facet receives innervation from two levels (the corresponding one and the one above). This double innervation explains why facet pain is often diffuse and difficult to localize precisely. Innervation is also fundamental for therapeutic procedures (blocks and denervation).

Regional Differences

Causes of Facet Syndrome

Facet Arthrosis

The most common cause is arthritic degeneration of the facets, analogous to arthrosis of any other synovial joint:

• Cartilage thinning
• Subchondral bone sclerosis
• Formation of osteophytes
• Thickening of the articular capsule
• Joint effusion (hydrops)
• Formation of synovial cysts

Facet arthrosis is radiologically detectable in 60-80% of over 50s, but the correlation between radiographic severity and symptoms is poor.

Mechanical Overload

• Disc degeneration: when the disc loses height, the load on the facets increases significantly (from 10-20% up to 40-70%)
• Lumbar hyperlordosis: accentuates the load on the lumbar facets
• Repeated extension: sports and jobs requiring hyperextension
• Spondylolisthesis: vertebral slippage alters facet mechanics

Segmental Instability

After disc surgery or in the presence of ligamentous laxity, the facets can be subjected to abnormal stress.

Trauma

Whiplash (cervical), falls on the buttocks (lumbar), can directly damage facet capsules and cartilages.

Inflammation

• Facet synovitis: inflammation of the synovial membrane
• Meniscoid entrapment: synovial folds can become trapped between the articular surfaces, causing acute pain

Risk Factors

• Age > 50 years: facet arthrosis is almost universal after 60 years
• Sedentary lifestyle: muscle weakness transfers more load to the facets
• Overweight: increased axial loads
• Jobs requiring extension: painters, bricklayers, electricians
• Sports with hyperextension: gymnastics, diving, tennis (serve)
• Previous disc surgeries: disc removal increases facet load
• Postural alterations: hyperlordosis, pelvic asymmetries

Symptoms

Lumbar Facet Pain

• Location: paravertebral pain (lateral to the midline), typically unilateral or predominant on one side
• Radiation: pain can radiate to the buttock, posterior and lateral thigh, down to the knee — but not beyond the knee (unlike sciatica)
• Character: dull, deep, cramp-like
• Aggravated by: trunk extension, rotation, prolonged standing, going down stairs, getting up from a chair
• Relieved by: trunk flexion, sitting position, side lying with knees bent
• Morning stiffness: present but short-lived (< 30 minutes)
• Absence of neurological deficits: no altered reflexes, strength, or sensation (if present, look for another cause)

Cervical Facet Pain

• Location: posterior and lateral neck pain
• Radiation: shoulder, interscapular region, occiput (can cause headache)
• Limited rotation: especially towards the painful side
• Cervical arthrosis: often coexists with cervical facet syndrome

Thoracic Facet Pain

• Location: paravertebral thoracic back pain, often bilateral
• Intercostal pain: due to radiation along the rib course
• Can mimic cardiac or pleuritic pain

Diagnosis

Clinical Examination

• Palpation: tenderness to paravertebral pressure over the articular processes
• Extension + rotation: the combination of extension and ipsilateral rotation reproduces the pain (Kemp’s test)
• Flexion: typically reduces pain
• Neurological examination: negative (normal reflexes, strength, and sensation)
• SLR (Lasègue): negative (helps rule out disc herniation)

Imaging

• X-ray: may show facet osteophytes, reduced joint space, sclerosis. However, correlation with symptoms is poor
• CT: better for evaluating the bony morphology of the facets (osteophytes, cysts, hypertrophy)
• MRI: can show facet effusion, synovial cysts, periarticular bone edema. Useful for ruling out disc herniation and spinal canal stenosis

Diagnostic Block (Gold Standard)

The facet diagnostic block is the only test that can definitively confirm that the facets are the source of pain:

• Small volumes of local anesthetic (0.3-0.5 ml) are injected onto the medial branch of the dorsal ramus under fluoroscopic guidance
• If pain is reduced by at least 80% for the duration of the anesthetic, the test is positive
• Generally, two blocks are performed with anesthetics of different durations (comparative block) to reduce false positives

Differential Diagnosis

• Disc herniation: radicular pain below the knee, positive Lasègue, neurological deficits
• Spinal canal stenosis: neurogenic claudication, bilateral symptoms
• Sacroiliitis: lower pain, positive specific tests
• Vertebral fractures: acute pain after trauma or in osteoporotic patients

Conservative Treatment

Acute Phase

• Medications: NSAIDs, muscle relaxants, paracetamol
• Relative rest: avoid positions and movements that accentuate pain (extension, rotation under load)
• Cryotherapy or thermotherapy: according to patient preference
• Antalgic posture: lumbar flexion position (knees to chest, fetal position)

Manual Therapy

Manual therapy is particularly effective in facet syndrome:

• Joint mobilization: passive accessory mobilization techniques (Maitland grades I-IV) on the involved facets to restore joint play
• Spinal manipulation (HVLA thrust): may be indicated in subacute phases for the “release” of entrapped meniscoids and reduction of reflex muscle spasm
• Myofascial techniques: release of paravertebral muscles and quadratus lumborum, often contracted
• Neural mobilization: when an associated component of radicular irritation is present

Instrumental Physiotherapy

• Tecar therapy: can reduce capsular inflammation
• TENS: useful for pain control
• Ultrasound: anti-inflammatory effect on facet capsules

Exercise Program

Core Stabilization

• Transversus abdominis activation: supine, pull the navel towards the spine without holding breath. 3 sets of 10, hold for 10 seconds
• Dead bug: supine, alternate extending opposite arm and leg. 3 sets of 10
• Modified front plank (on knees, then full): 3 sets of 20-30 seconds
• Side plank: 3 sets of 15-20 seconds per side

Flexion Exercises (Williams Program)

In lumbar facet syndrome, flexion exercises are preferable to extension exercises:

• Knees to chest: supine, bring both knees to the chest. Hold for 20 seconds, 10 repetitions
• Pelvic tilt (pelvic retroversion): supine, flatten the lumbar lordosis to the floor. 3 sets of 15
• Partial curl-up: crunch with only the shoulder blades lifting off the floor. 3 sets of 15
• Cat stretch: on all fours, arch the back upwards (only the flexion phase). 15 repetitions

Stretching

• Hip flexor stretch: lunge with pelvic retroversion. 3 x 30 seconds per side
• Quadratus lumborum stretch: lateral trunk flexion. 3 x 30 seconds per side
• Hamstring stretch: supine with elastic band. 3 x 30 seconds per side
• Rotator stretch: seated, trunk rotation. 3 x 20 seconds per side

Aerobic Activity

• Walking: 30 minutes a day
• Swimming: excellent for unloaded mobilization
• Exercise bike: with a slightly flexed posture (unloads the facets)
• Aquagym: mobilization in the absence of gravity

Infiltrative Procedures

Facet joints are paired synovial joints located on both sides of each vertebra that guide spinal movement, bear axial loads, and limit excessive motion through cartilage-covered articular surfaces innervated by medial branch nerves. When conservative treatment is not sufficient (after 6-8 weeks), the specialist doctor may propose:

Facet Joint Injection

Injection of corticosteroid + anesthetic directly into the facet joint under fluoroscopic or ultrasound guidance. Relief in 50-70% of cases, variable duration (weeks-months).

Medial Branch Block

Injection of anesthetic + corticosteroid onto the medial branch of the dorsal ramus. More precise than intra-articular infiltration.

Radiofrequency Denervation (Rhizotomy)

In case of a positive response to diagnostic blocks but only temporary relief, thermal neurotomy of the medial branch can be performed:

• Under fluoroscopic guidance, a needle with a thermal tip is positioned next to the nerve
• The thermal lesion (80°C for 60-90 seconds) interrupts pain transmission
• Efficacy: significant relief in 60-80% of patients
• Duration: 6-24 months (the nerve progressively regenerates)
• Repeatable: the procedure can be repeated with good results

Prognosis

• Acute forms (meniscoid entrapment, acute synovitis): resolution in 2-6 weeks with manual therapy
• Chronic forms (facet arthrosis): fluctuating course with periods of exacerbation and remission. Muscle strengthening and postural modifications allow good symptom control in most cases
• Facet syndrome is a manageable condition but requires an active approach from the patient (regular exercises, weight management, ergonomics)

Frequently Asked Questions (FAQ)

Frequently Asked Questions

How is facet pain distinguished from disc herniation pain?

Facet pain often presents with localized tenderness over the affected joint and can be exacerbated by extension and rotation of the spine. Disc herniation pain, in contrast, frequently involves radiating pain down an extremity, often accompanied by neurological symptoms like numbness or weakness. A diagnostic block, which temporarily numbs the facet joint, is considered the gold standard for confirming facet joint involvement.

Can exercises worsen facet syndrome?

Appropriate exercises, guided by a physical therapist, are a crucial component of conservative treatment for facet syndrome. However, certain movements, particularly those involving excessive spinal extension or rotation without proper control, could potentially exacerbate symptoms. It is essential to perform exercises correctly and within pain-free ranges to promote joint stability and reduce discomfort.

Is facet syndrome visible on an MRI?

While an MRI can reveal degenerative changes such as arthrosis in the facet joints, these findings do not always correlate directly with the presence or severity of facet joint syndrome symptoms. Imaging alone is often insufficient for a definitive diagnosis, as many individuals without pain may show similar degenerative changes. Clinical examination and diagnostic blocks are typically more reliable for confirming facet joint syndrome.

Does facet syndrome worsen with age?

Facet joint syndrome often results from arthritic changes and mechanical stress, which can naturally progress with age due to wear and tear on the joints. While the prevalence of degenerative changes increases with age, not everyone will experience worsening symptoms. Effective management strategies, including physical therapy and lifestyle adjustments, can help mitigate symptoms and maintain function over time.

Sources and Scientific References

1. Cohen SP et al. (2007). Pathogenesis, diagnosis, and treatment of lumbar zygapophysial (facet) joint pain. Anesthesiology. 106:591-614. DOI | PubMed
2. Nedelka T et al. (2025). Efficacy of high-energy, focused ESWT in treatment of lumbar facet joint pain: a randomized sham-controlled trial. Int J Surg. 111:4177-4186. DOI | PubMed
3. Du R et al. (2024). Percutaneous radiofrequency ablation and endoscopic neurotomy for lumbar facet joint syndrome: are they good enough? Eur Spine J. 33:463-473. DOI | PubMed
4. Mehta M et al. (1994). Mechanical back pain and the facet joint syndrome. Disabil Rehabil. 16:2-12. DOI | PubMed
5. Manfré L (2014). CT-Guided Transfacet Pedicle Screw Fixation in Facet Joint Syndrome: A Novel Approach. Interv Neuroradiol. 20:614-20. DOI | PubMed