A clinical synthesis based on the ASIPP 2020 guidelines (Manchikanti), the Cohen 2020 multispecialty consensus, the MINT trial (Juch JAMA 2017) and the Hayden Cochrane 2021 exercise NMA.

How is this condition defined, who is affected and what are the risk factors?

• Advanced age is the strongest predictor ⏳: cumulative mechanical wear, proteoglycan changes in the cartilage, paravertebral sarcopenia and a loss of subchondral bone quality.⁴,⁷
• A high body mass index (BMI) 🍔: overweight and obesity increase the compressive loads on the lumbar spine and accelerate degeneration (with an additional metabolic effect through leptin and pro-inflammatory cytokines).⁴,⁷
• Female sex ♀: women show a higher prevalence and severity overall, possibly linked to hormonal factors (oestrogens after the menopause) and to biomechanical differences (facet orientation, lumbar lordosis).⁴
• Intervertebral disc degeneration 🎯: this is the major initiating factor. The loss of disc height transfers load onto the posterior facets and can overload them by 3 to 4 times; this biomechanical mechanism is central to the secondary development of facet arthropathy (Gellhorn, Katz & Suri, Nat Rev Rheumatol 2013).⁷
• Genetic factors and a general predisposition to osteoarthritis : the concordance with knee and hip osteoarthritis suggests a common background; patients with multi-site osteoarthritis more often have symptomatic facet arthropathy.⁴,⁷
• Repeated microtrauma and certain occupations that expose the lumbar spine to extension and rotation stresses (carrying loads, vibration, sports with hyperextension) can speed up the breakdown.¹,⁴

What happens in the body and how does facet arthropathy evolve naturally?

1. Breakdown of the articular cartilage : thinning, fissuring, erosion of the surfaces. This breakdown is mediated by matrix metalloproteinases (MMP-3, MMP-13) and by ADAMTS-5.⁴,⁷
2. Synovitis (synovial inflammation) 🔥: the synovial membrane thickens, becomes hypertrophic and releases pro-inflammatory mediators, interleukin-1β (IL-1β), interleukin-6 (IL-6) and tumour necrosis factor-α (TNF-α), which accelerate cartilage destruction and sensitise the local nerve endings (peripheral sensitisation).¹,⁷,⁸
3. Subchondral bone remodelling and osteophyte formation : sclerosis, subchondral cysts and osteophytes around the joint, contributing to the facet hypertrophy seen on imaging.⁴,⁷
4. Innervation of the facet 🧠: each facet joint receives a double innervation from the medial branches of the dorsal ramus of the spinal nerves at its own level and at the level above (key anatomy for the radiofrequency neurotomy strategy: a single facet level requires denervation of two medial branches).²,³

• Foraminal stenosis (narrowing of the intervertebral foramen and compression of the emerging root);
• Central or lateral canal stenosis (narrowing of the spinal canal);
• Degenerative spondylolisthesis (most often L4-L5) linked to facet incompetence.

Which questions should you ask to understand the patient and their history?

• Location of the pain 📍: low back pain, paravertebral, most often unilateral (sometimes bilateral). It can radiate towards the buttock, the hip or the back of the thigh but classically stops above the knee , an important point of difference from radiculopathy.²,⁴
• Character of the pain : a dull, poorly localised ache, sometimes described as a « tight depth ». Rarely sharp or stabbing.²,⁴
• Aggravating factors ⚠️: the pain worsens with the positions that load the facets, lumbar extension, hyperextension, prolonged standing, prolonged walking, and rotation or side bending towards the painful side. High heels, standing work and reaching up to open windows are classic provocative situations.²,⁴
• Relieving factors ✅: the pain eases in flexion (bending forward), on prolonged sitting, and with the hips flexed in bed (knees bent). These positions « open » the facet space and unload the joint.²,⁴
• Circadian rhythm : brief morning stiffness (generally < 30 minutes), start-up pain after a period of inactivity, improvement with moderate movement but worsening with overuse.²,⁴
• Course : chronic and fluctuating, with painful episodes alternating with quiet periods; no systemic neurological signs (no radiation below the knee, no sclerotomal paraesthesia).²,⁴

Which clinical tests should you perform and which other conditions should you rule out?

• Palpation of the articular pillars 🖐️: deep palpation of the facets can reproduce the pain, but specificity is very low (many neighbouring structures are tender).
• Kemp test / quadrant test : extension + rotation + side bending towards the painful side to compress the facet. Sensitivity and specificity judged modest; reproducibility average.⁵
• Revel test (a pre-MBB cluster) : a set of accumulated history variables (age > 65, pain relieved by walking, and so on), of limited use in practice according to recent reviews.²,⁵
• Straight leg raise (Lasègue) : negative classically (no root compression), useful in the differential.
• Neurological examination : normal in pure facet arthropathy (strength, sensation and tendon reflexes preserved). Any neurological sign calls for the diagnosis to be reconsidered towards root compression or canal stenosis.

• Rule out serious conditions (red flags): fracture, infection, malignancy, cauda equina syndrome;
• Characterise an associated foraminal or canal stenosis;
• Plan a guided intervention (injection, radiofrequency neurotomy).

• Discogenic pain : worse in flexion and on prolonged sitting, relieved by partial extension, with possible radiation along the matching dermatome.
• Sacroiliac joint syndrome : pain located lower down (around the PSIS), specific provocation tests (the Laslett cluster: compression, distraction, sacral thrust, femoral thrust, Gaenslen).
• Myofascial syndrome : trigger points in quadratus lumborum, gluteus medius and piriformis.
• Lumbar radiculopathy : pain radiating below the knee, a neurological deficit (sensory, motor, reflexes).
• Degenerative lumbar spinal stenosis : neurogenic claudication (leg pain on walking, relieved by trunk flexion), a reduced walking distance, often a late complication of facet arthropathy.
• Hip pathology (hip osteoarthritis): groin pain, restricted flexion and internal rotation (FABER test).
• Inflammatory spondyloarthritis : an inflammatory picture with ASAS criteria, HLA-B27, syndesmophytes, sacroiliitis on MRI.

Should these patients be classified, and for what benefit?

• Worsens in lumbar extension, on prolonged standing and on prolonged walking;
• Improves in flexion and on sitting (to be told apart from discogenic pain, which responds the other way round);
• Stays localised to the lower back or radiates little (rarely below the knee).

• Targeted treatment direction : exercises favouring lumbar flexion and motor control, avoiding prolonged hyperextension positions, working on hip mobility in flexion to unload the lower back.⁸,⁹
• Managing expectations : explaining to the patient that their pain follows mechanical patterns improves adherence and self-management (Foster 2018).⁸
• Stratified care : reserving the more invasive investigations (diagnostic blocks) for patients refractory to well-conducted conservative management for at least 6 to 12 weeks.²,³

Criticism and controversies: the diagnostic paradox

Where do you start? What is the recommended hierarchy of interventions?

What place does exercise hold and is there a superior approach?

• Motor control and segmental stabilisation : the Cochrane review by Saragiotto 2016 (CD012004) confirms the efficacy of motor control exercise (MCE) targeting transversus abdominis and multifidus, with a modest but significant effect on pain and function.⁷
• Progressive strengthening : strengthening the trunk, the posterior chain (glutes, hamstrings) and the deep stabilisers. No single « winning » protocol.
• Graded exposure ✅: a progressive return to the movements and postures avoided through fear of pain, the basis of graded exposure and of graded activity.
• Moderate-intensity aerobic work : walking, cycling, swimming, which reduces central sensitisation and improves overall function.⁵
• Patient adherence = factor number one : choose an activity that means something to the patient and that they will enjoy keeping up in the long term. The best results come from compliance, not from the « perfect » technique.⁵,⁶

Manual therapies and technologies: how effective are they really?

Beyond the physical: how do you educate the patient and address psychological factors?

• Pain is a complex production of the nervous system, not a simple indicator of tissue damage;
• The presence of abnormalities on imaging does not mean fragility;
• Movement and exercise modulate the perception of pain positively (the analgesic effect of exercise);
• Prolonged rest and avoidance are harmful in the medium and long term (deconditioning, kinesiophobia).

• Kinesiophobia (fear of movement), the TSK-11;
• Catastrophising , the Pain Catastrophizing Scale (PCS);
• Depressive or anxious symptoms , PHQ-9, GAD-7, HADS;
• Mistaken beliefs about pain, the Fear-Avoidance Beliefs Questionnaire (FABQ);
• Occupational context and compensation (blue and black flags).

How do you make the patient an active player in their own recovery through self-management?

1. In-depth therapeutic education : taking apart the mistaken beliefs (« my back is fragile », « I have osteoarthritis, so I must not move »), a realistic explanation of the limited meaning of imaging abnormalities, demystifying chronic pain.⁴,⁵
2. A personalised independent exercise programme : a set of simple, repeatable home exercises the patient can keep up on their own. Favour enjoyable and adaptable approaches (Pilates, yoga, Tai Chi, Nordic walking, cycling, swimming).⁶
3. Behavioural strategies : setting progressive SMART goals (Specific, Measurable, Achievable, Realistic, Time-bound), activity planning, graded exposure, stress management.⁵
4. Managing flare-ups : preparing the patient to recognise and handle pain peaks without panicking or cutting back on activity, staying as active as possible.
5. A support network : encouraging physical activity in groups (associations, clubs), favouring social interaction and avoiding isolation.

When and how do you plan a safe return to activity?

• Phase 1, pain control and restoration of functional range : moderate daily walking, gentle mobility, diaphragmatic breathing exercises, activation of the deep muscles (transversus abdominis, multifidus).⁶,⁷
• Phase 2, progressive strengthening and muscular endurance : dynamic stabilisation exercises, posterior chain strengthening (squat, hip thrust, deadlifts adapted to the tolerance threshold), progressive planks.
• Phase 3, reintroduction of specific loads : sporting or occupational movements reproduced progressively, with a reduced initial volume and controlled progression. The criterion for progressing: no significant increase in pain in the 24 h after the effort.
• Phase 4, return to full activity : volume and intensity increased gradually, with training load monitored to avoid overtraining.

Criticism and controversies: « core stability », adherence and the limits of the model

Why does this subgroup deserve a dedicated section?

• Pain, paraesthesia or weakness in one or both legs appearing on walking or on prolonged standing;
• Characteristic relief on trunk flexion (leaning forward on a trolley, uphill more easily than downhill, on a bicycle);
• A reduced walking distance, progressively disabling;
• A neurological examination often unremarkable at rest, but richer after exertion.

• Sarcopenia : the age-related loss of muscle mass and strength, which worsens segmental instability (weak multifidus) and reduces exercise tolerance. EWGSOP2 criteria (grip strength, gait speed, lean mass).
• Frailty (the frailty syndrome): Fried criteria (weight loss, weakness, slowness, low activity, exhaustion), which raise the risk of falls and of dependency.
• Osteoporosis : a raised risk of vertebral fracture (new acute pain in an older person → a red flag).
• Multimorbidity and polypharmacy : drug interactions, the risk of falls (benzodiazepines, antipsychotics, antihypertensives).
• Physical deconditioning and a progressive loss of independence.
• Social isolation and depressive symptoms, which amplify the perception of pain.

How do you adapt the assessment and the management?

• Screen for sarcopenia (grip strength, gait speed < 1 m/s, chair stand test);
• Assess the risk of falls (Tinetti, Berg, Timed Up and Go > 13.5 s);
• Walking distance (a 6-minute walk test or an inclined treadmill test to unmask the claudication);
• A brief cognitive assessment (MMSE, MoCA) if cognitive decline is suspected as affecting adherence;
• Depressive symptoms (the Geriatric Depression Scale);
• A careful neurological examination (reflexes, strength, sensation, sphincters);
• Identification of the specific red flags (see the box).

• Favour exercises in flexion (a « flexion-biased programme »): positions and movements that open the canal space (supine knees to chest, four-point kneeling in flexion, cycling, progressive lumbar flexion exercises). This is the Bodack & Monteiro approach, shown to be effective in lumbar stenosis.²
• Aerobic exercise on a cycle ergometer 🚴 (the flexed position is well tolerated): improves functional capacity without provoking the claudication.
• Multi-modal strengthening targeting the deep postural muscles (multifidus, transversus), the hip extensors (glutes), the trunk flexors and the stability of the cross chains, without excessive hyperextension.
• An anti-sarcopenia programme : progressive strengthening of the large muscle groups (adapted squats, leg press, resistance band exercises) with controlled progression.
• Fall prevention : balance exercises (tandem, single-leg, unstable surfaces), strengthening the dorsiflexors of the foot, Nordic walking with poles.
• Environmental adaptation and ergonomic advice : using a shopping trolley (an analgesic effect in flexion), grab rails at home, suitable footwear.
• A multidisciplinary approach : working with a geriatrician, a PRM physician, an occupational therapist, a dietitian (protein > 1.0-1.2 g/kg/day in older people to limit sarcopenia), and a psychologist where needed.

Analysis of a "classic" case: from assessment to conservative resolution

• A patient aged 50-65, with a history of sedentary work or of prolonged standing;
• Chronic low back pain with flare-ups, paravertebral and unilateral;
• Worse on extension, on prolonged standing and on stairs;
• Relieved in flexion, on sitting, and lying with knees to chest;
• MRI showing facet arthropathy at L4-L5 / L5-S1, with no disc herniation and no significant root compression;
• A normal neurological examination.

• Patient education about the condition, taking apart the nocebo (« osteoarthritis visible on MRI »), explaining the dissociation between imaging and symptoms.³,⁴
• Joint mobilisation (Maitland grade III-IV techniques on the hypomobile segments, gentle lumbar flexion mobilisation, hip mobilisation).⁵
• A targeted exercise programme : motor control (transversus, multifidus), strengthening the hip extensors, stretching the hip flexors, lumbar flexion exercises (knees to chest, child pose, flexion in four-point kneeling).⁶
• Ergonomic advice : avoiding prolonged hyperextension, alternating positions, adjusting the workstation, progressive walking.

The diagnostic challenge: when facet arthropathy mimics a radiculopathy

• Radiation stopping above the knee;
• No neurological deficit (strength, sensation and reflexes preserved);
• Worse in extension and relieved in flexion (the opposite of discogenic radiculopathy);
• A negative Lasègue;
• MRI showing advanced facet arthropathy with no compressive disc herniation.

A complex case: the facet synovial cyst

Critique and controversy: the value and the limits of clinical cases

• The weakest level of evidence (level 5 CEBM, very low GRADE);
• A major publication bias
• : the spectacular cases (complete resolution, atypical presentation) are over-represented;
• No generalisation is possible: a case illustrates, it never demonstrates efficacy; Where a spectacular case and a meta-analysis diverge,.

When, and to which other health professionals, should you refer?

• A history of cancer or unexplained weight loss;
• Fever, immunosuppression, IV drug use;
• Significant recent trauma, osteoporosis;
• A progressive or severe neurological deficit;
• Cauda equina syndrome (saddle anaesthesia, sphincter disturbance), an emergency;
• Non-mechanical night pain, unrelieved by rest;
• Systemic symptoms (sweats, chills).

• PRM physician / rheumatologist : refractory chronic pain, suspected spondyloarthritis, discussion of interventional options;
• Neurosurgeon / orthopaedic surgeon : degenerative lumbar spinal stenosis with a major functional impact, a progressive neurological deficit, segmental instability;
• Pain specialist : severe chronic pain, a candidate for radiofrequency neurotomy;
• Psychologist specialising in pain : severe kinesiophobia, catastrophising, comorbid depression, post-traumatic stress;
• Geriatrician : a frail older person with multimorbidity;
• Dietitian : a high BMI, sarcopenia (protein intake);
• Occupational therapist : adapting the workstation or the home environment.

How do you measure outcomes and overcome the barriers to implementation?

• The 6-minute walk test (aerobic capacity, claudication in older people);
• Timed Up and Go (fall risk);
• The 30-second chair stand test (lower limb strength);
• Sit-and-reach (posterior chain flexibility).

• Audit and feedback 📊: the Ivers 2012 Cochrane review, collecting practice data and giving constructive comparative feedback.⁶
• Local opinion leaders and « champions »: respected peers who promote good practice.
• Interactive training (workshops, mentoring, simulation), more effective than simply circulating guidelines.
• Building PROMs into the workflow (digitised, automated).
• Shared decision-making with the patient: better adherence, satisfaction and outcomes.

Criticism and controversies: between the evidence ideal and pragmatic reality