Plantar Fasciitis

• Risk factors: obesity, prolonged standing on hard surfaces, running (especially a sudden increase in mileage), reduced ankle dorsiflexion with a tight Achilles tendon, pes planus and pes cavus.
• The diagnostic history is highly characteristic: sharp heel pain that is worst with the first steps in the morning or after a period of sitting, easing after a few minutes of walking, then returning with prolonged activity.
• Examination: point tenderness at the medial calcaneal tubercle, worsened by passive dorsiflexion of the toes (the windlass mechanism).
• Heel spurs are incidental. They are present in many asymptomatic people and absent in many symptomatic ones, and are not the cause of pain — a favourite exam point.
• Consider alternatives when the history does not fit: calcaneal stress fracture (pain on squeezing the calcaneus from both sides), fat pad atrophy (central heel), tarsal tunnel syndrome (burning, paraesthesia, positive Tinel), and in a young patient with bilateral heel pain and inflammatory features, a seronegative spondyloarthropathy.
• Management is conservative and effective in the large majority: plantar fascia and calf stretching, supportive footwear and orthoses, activity modification, weight reduction, and night splints. Corticosteroid injection carries a risk of fascial rupture and fat pad atrophy.

Repetitive tensile overload (training/occupational)

• Running and jumping athletes: a sudden increase in mileage, hill or speed work, or a switch to minimalist shoes raises peak fascial tension per stride.
• Prolonged weight-bearing on hard surfaces: nurses, teachers, factory and retail workers — the classic occupational stem.

Increased static load

• Obesity: the single strongest modifiable association in non-athletes; body weight is transmitted through the arch on every step.
• Pregnancy and rapid weight gain: same mechanism, plus relaxin-mediated ligamentous laxity.

Biomechanical predisposition

• Limited ankle dorsiflexion with a tight gastrocnemius–soleus–Achilles complex: the most consistently identified risk factor. An equinus foot cannot dorsiflex at the ankle, so the arch must elongate instead, and that strain lands on the fascial origin.
• Pes planus and pes cavus: both extremes fail — the flat foot overstretches the fascia, the cavus foot cannot absorb shock.
• Leg-length discrepancy, excessive subtalar pronation, weak intrinsic foot muscles.

Non-modifiable

• Age 40–60 (peak incidence), female sex, and inherited foot architecture.

Systemic mimics planted in stems

• Seronegative spondyloarthropathy (reactive arthritis, ankylosing arthritis, psoriatic arthritis) causes true enthesitis — suspect it with bilateral heel pain in a young patient, inflammatory back pain, or dactylitis.
• Diabetes mellitus is associated with heel pain and with fat pad changes.
• Fluoroquinolones are linked to enthesopathy/tendinopathy generally; the Achilles is the classic site.

Normal anatomy and the windlass

• The plantar fascia is a thick aponeurosis running from the medial calcaneal tuberosity to the plantar plates and proximal phalanges of the toes. It is the principal static support of the medial longitudinal arch.
• During terminal stance, dorsiflexion of the MTP joints winds the fascia around the metatarsal heads like a cable around a drum — the windlass mechanism — shortening the distance between calcaneus and forefoot, elevating the arch, and converting the flexible foot into a rigid lever for push-off. This is why passive toe dorsiflexion reproduces pain on exam.

Insult to lesion

• Repetitive tensile strain concentrates at the enthesis, the least compliant point in the load path. Microtearing exceeds the repair capacity of a poorly vascularised fibrocartilaginous insertion.
• The result is a failed healing response: collagen disarray, myxoid/mucoid degeneration, angiofibroblastic hyperplasia, and increased ground substance, with few or no inflammatory cells. Histologically this is a fasciosis, which is why the name "fasciitis" is a misnomer and why anti-inflammatory drugs relieve symptoms without altering the lesion.
• Tight Achilles/limited dorsiflexion amplifies the process: force that cannot be dissipated by ankle dorsiflexion is transmitted through the calcaneus into the fascial origin.

Lesion to symptoms

• First-step pain: during sleep the foot rests plantarflexed with toes flexed, so the fascia shortens and the degenerative tissue heals in a contracted position. The first weight-bearing steps abruptly re-elongate and re-microtear it — hence sharp pain that eases after a few minutes as the tissue accommodates, then returns with prolonged loading later in the day.
• Heel spur: a traction enthesophyte forming within the origin of the flexor digitorum brevis, oriented along lines of pull. It is a marker of chronic traction, not the pain generator — spurs are common in asymptomatic feet and absent in many symptomatic ones.

Symptoms (classic first)

• First-step pain: sharp, stabbing inferomedial heel pain with the first steps out of bed in the morning, or on standing after prolonged sitting (post-static dyskinesia) — the fascia has shortened in plantarflexion and is abruptly re-loaded.
• Warm-up phenomenon: pain eases after several minutes of walking as the tissue accommodates, then returns as a dull ache with prolonged standing or walking later in the day. Pain that is worst at rest and never with activity argues against the diagnosis.
• Worse barefoot on hard surfaces and in unsupportive shoes; better in cushioned, supportive footwear.
• No true night pain, no numbness, no paraesthesia — those point to tarsal tunnel syndrome or radiculopathy.

Examination

• Point tenderness at the medial calcaneal tubercle — reproducible with the examining thumb, and the single most useful sign. Tenderness spread diffusely across the whole heel or centrally suggests fat pad atrophy.
• Windlass test: passive dorsiflexion of the great toe (ideally with the patient weight-bearing on a step) tensions the fascia and reproduces the pain — specific, but not highly sensitive.
• Reduced ankle dorsiflexion with the knee extended, indicating gastrocnemius tightness; a taut, tender fascial band may be palpable.
• Negative calcaneal squeeze test (medial–lateral compression) — a positive squeeze suggests calcaneal stress fracture.
• Negative Tinel sign over the tarsal tunnel; intact sensation and pulses.
• No erythema, warmth, swelling, or effusion. Their presence should redirect toward infection, fracture, or inflammatory enthesitis.
• Antalgic gait with weight shifted laterally or toe-walking to unload the heel.

Step 1 — This is a clinical diagnosis.

• The Academy of Orthopaedic Physical Therapy (APTA) heel pain guideline and the ACR Appropriateness Criteria for chronic foot pain both support diagnosis by history and physical examination alone, with no imaging at initial presentation in a typical case. The triad of first-step pain, point tenderness at the medial calcaneal tubercle, and a positive windlass test is sufficient.
• Function is tracked with validated patient-reported measures named in the APTA guideline — the Foot and Ankle Ability Measure (FAAM) and the Foot Function Index (FFI) — not with imaging.

• Weight-bearing plain radiographs of the foot first — to exclude calcaneal stress fracture, unicameral bone cyst, or tumour. An incidental inferior calcaneal spur may be seen and should be explicitly disregarded as a cause.
• Ultrasound is the practical confirmatory study: thickening of the plantar fascia at its origin (a threshold near 4 mm is conventionally cited), hypoechogenicity, and loss of the normal fibrillar pattern; sometimes perifascial fluid. Cheap, dynamic, and can guide injection.
• MRI for equivocal or recalcitrant cases and the best test to sort out mimics: fascial thickening with increased T2/STIR signal, perifascial and marrow oedema. MRI also detects calcaneal stress fracture (marrow oedema, low-signal fracture line) far earlier than radiographs.

Step 3 — Targeted work-up for mimics

• Bilateral heel pain in a young patient with inflammatory back pain, dactylitis, uveitis, or urethritis: ESR/CRP, HLA-B27, sacroiliac imaging for spondyloarthropathy.
• Burning, paraesthesia, positive Tinel: electrodiagnostic study for tarsal tunnel syndrome or entrapment of the first branch of the lateral plantar nerve (Baxter's nerve).
• There is no named scoring system used to make the diagnosis.

First-line (weeks 0–6, all patients)

• Plantar fascia–specific stretching (toes dorsiflexed, cross-legged, before the first steps of the morning) and gastrocnemius/soleus stretching — corrects the equinus that drives fascial strain. Strongly recommended by the APTA guideline.
• Foot orthoses: prefabricated arch supports perform as well as custom devices in the short term; both reduce fascial tension. Supportive, cushioned footwear; avoid barefoot walking on hard floors.
• Manual therapy and antipronation/low-Dye taping for short-term pain relief (APTA guideline).
• Activity modification and weight reduction — address the mechanical cause, not just the symptom.
• NSAIDs (drug class first): a nonselective agent such as ibuprofen for short-term analgesia only. The lesion is degenerative, so NSAIDs do not modify disease.
• Night splints holding the ankle in dorsiflexion, especially valuable for patients whose dominant complaint is morning first-step pain, since they prevent overnight fascial shortening.

Escalation (3–6 months of failure)

• Corticosteroid injection (e.g., methylprednisolone), ideally ultrasound-guided: reliable short-term relief only, with no durable benefit — and real risk of fascial rupture and heel fat pad atrophy. Repeated injections should be avoided.
• Extracorporeal shockwave therapy (ESWT) for recalcitrant cases; dry needling has supporting evidence in the APTA guideline. Platelet-rich plasma remains investigational.
• Trials of a short walking boot or cast immobilisation in severe refractory cases.

• Partial (medial) plantar fasciotomy, open or endoscopic; gastrocnemius recession when isolated equinus is the driver.

Of the disease

• Chronic recalcitrant heel pain: persistent degenerative fasciosis lasting more than a year; signalled by unremitting pain despite adherent stretching and orthoses. Leads to deconditioning and work absence.
• Antalgic gait compensation: weight shifted laterally and onto the forefoot produces secondary metatarsalgia, lateral foot pain, Achilles tendinopathy, and ipsilateral knee, hip, or low back pain.
• Spontaneous plantar fascia rupture: an acute pop with sudden midfoot pain, plantar ecchymosis, swelling, and flattening of the medial longitudinal arch. More common after injection or in athletes who continue high loads.

Of treatment

• Corticosteroid injection — the highest-yield iatrogenic pair: plantar fascia rupture (steroid impairs tenocyte collagen synthesis at an already degenerative enthesis) and heel fat pad atrophy (lipolysis of the fibro-fatty septa), which converts a treatable traction pain into a permanent, poorly treatable central heel pain on every heel strike. Also skin depigmentation and subcutaneous atrophy along the needle track.
• NSAIDs: gastropathy, renal impairment, hypertension — relevant in the older, comorbid patient this disease selects for.
• ESWT: transient post-procedure pain, ecchymosis, local swelling; generally self-limited.
• Surgery: over-release causes lateral column overload and arch collapse (flatfoot with midfoot pain); injury to the first branch of the lateral plantar nerve (Baxter's nerve) causes persistent burning heel pain; also calcaneal stress fracture, wound infection, and complex regional pain syndrome with allodynia and vasomotor change.

Red flags demanding urgent evaluation rather than reassurance

• Fever, erythema, warmth, or a plantar ulcer in a diabetic patient — consider calcaneal osteomyelitis or deep space infection; this is the emergency in this differential.
• Focal heel pain after a fall from height or a positive calcaneal squeeze test — calcaneal fracture or stress fracture.
• Night pain, weight loss, or a palpable mass — neoplasm.
• Progressive numbness or motor weakness — nerve entrapment or radiculopathy, not fasciitis.

• First-step pain is the buzzword: sharp inferomedial heel pain with the first steps in the morning or after sitting, easing with a few minutes of walking, returning after prolonged standing. If the vignette gives you this plus point tenderness at the medial calcaneal tubercle, the diagnosis is made.
• Single best next step in a typical case is treatment, not imaging. Stretching of the plantar fascia and calf, supportive footwear/orthoses, activity modification, and weight loss. Ordering an X-ray or MRI first is the classic wrong answer.
• Heel spurs are incidental. This is the association examiners most love to test in reverse — a spur on radiograph neither confirms the diagnosis nor warrants resection.
• It is a fasciosis, not a fasciitis: degenerative collagen disarray with scant inflammatory cells. This explains why NSAIDs and steroids relieve symptoms transiently without curing the lesion.
• The windlass mechanism explains the exam finding: passive great-toe dorsiflexion tensions the fascia and reproduces pain; the same mechanism explains why overnight plantarflexion causes morning pain and why dorsiflexion night splints help.
• Corticosteroid injection is the trap answer for a first visit. Reserve it for refractory disease and know its two complications cold: plantar fascia rupture and heel fat pad atrophy.
• Know the four distractors: calcaneal stress fracture (positive squeeze test, recent increase in running, MRI marrow oedema), fat pad atrophy (elderly, central heel pain), tarsal tunnel syndrome (burning, paraesthesia, positive Tinel, positive electrodiagnostics), and seronegative spondyloarthropathy (young patient, bilateral heel enthesitis, inflammatory back pain, HLA-B27).
• Limited ankle dorsiflexion from a tight Achilles is the biomechanical risk factor most consistently linked to plantar fasciitis — and the reason gastrocnemius recession is an option when surgery is finally considered.