Plantar fasciitis

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Plantar Fasciitis

Overview Plantar fasciitis is the most common cause of plantar heel pain in adults, with peak incidence between ages 40-60 (younger in runners, dancers, and those doing aerobics) - Textbook of Family Medicine 9e, p. 240; Tintinalli's Emergency Medicine. Despite the "-itis" name, it's now understood as primarily a degenerative/overuse process (chronic microtears and injury-repair changes at the fascia's origin) rather than a purely inflammatory condition - Textbook of Family Medicine 9e, p. 240; Miller's Review of Orthopaedics, p. 592.

Anatomy/Pathology The plantar fascia is a fibrous band originating at the medial calcaneal tubercle, fanning across the sole and inserting into the proximal phalanges, where it supports the arch during gait. The pain originates at or near the fascia's attachment to the medial calcaneal tuberosity - Harrison's Principles of Internal Medicine 22E, p. 991. Repetitive microtrauma leads to microtears, an injury-repair response, and sometimes a traction osteophyte (heel spur) - Miller's Review of Orthopaedics, p. 592.

Risk factors

Obesity (BMI over 30 is considered the single biggest risk factor)
Pes planus (flat foot) or pes cavus (high arch)
Limited ankle dorsiflexion / tight Achilles-gastrocnemius-soleus complex
Prolonged standing, walking on hard surfaces, faulty footwear
In runners: sudden increase in mileage or switching to a harder running surface
Rarely, in younger patients: autoimmune/rheumatic disease should be considered

(Harrison's Principles of Internal Medicine 22E, p. 991; Tintinalli's Emergency Medicine, p. 277; Miller's Review of Orthopaedics, p. 592)

Clinical presentation

Sharp, stabbing plantar heel pain, classically worst with the first steps in the morning or after prolonged sitting/inactivity, that eases somewhat with continued weight-bearing but then worsens again with prolonged activity
Pain worse walking barefoot, climbing stairs, or with toe dorsiflexion
Numbness, tingling, bruising, and swelling are uncommon and should prompt consideration of alternative diagnoses
Bilateral symptoms occur in a meaningful subset; can coexist with posterior tibial tendon dysfunction

(Harrison's Principles of Internal Medicine 22E, p. 991; Textbook of Family Medicine 9e, p. 240; Miller's Review of Orthopaedics, p. 592)

Diagnosis Diagnosis is clinical, based on history and exam findings:

Exquisite point tenderness over the medial calcaneal tuberosity at the fascia's origin
Pain worsened by passive toe dorsiflexion
Imaging is not routinely needed. Plain radiographs (heel spurs) have little diagnostic value since many asymptomatic people have spurs too, but weight-bearing X-rays can help rule out stress fracture, subtalar arthritis, tumor, or insertional enthesophyte
Ultrasound may show fascial thickening and hypoechogenicity (edema); MRI is sensitive but rarely required

(Harrison's Principles of Internal Medicine 22E, p. 991; Miller's Review of Orthopaedics, p. 592)

Natural history Self-limited in the large majority: 80-95% of cases resolve within about 12 months regardless of specific treatment chosen (Harrison's, Tintinalli's, Miller's Orthopaedics all cite this).

Treatment

First-line/conservative (mainstay):

Plantar fascia-specific stretching and Achilles/calf stretching - considered the most effective conservative intervention
Rest, ice/ice massage, activity modification (avoid barefoot walking, hard surfaces)
Heel cushions, arch-support orthotics, taping/strapping
Night splints (holding ankle in dorsiflexion/neutral)
Short course of NSAIDs (helps via analgesic effect more than anti-inflammatory effect, given the degenerative rather than purely inflammatory nature)
Weight management if obese

Second-line:

Physical therapy, walking boot/cast for severe cases
Corticosteroid injection - provides short-term relief (roughly up to 1 month) but carries risk of plantar fascia rupture and fat pad atrophy; repeated injections (average ~2.67) increase rupture risk, so this is used judiciously and generally not first-line
Extracorporeal shockwave therapy (ESWT), platelet-rich plasma (PRP) injections - evidence is mixed/limited but showing some promise in recent systematic reviews

Surgical:

Reserved for the small minority (under 5%) who fail 6-12 months of conservative treatment
Options include limited (partial, medial) plantar fascia release; complete release risks destabilizing the arch and causing lateral column overload/metatarsal stress fractures
Gastrocnemius recession is used in select recalcitrant, overweight patients with calf tightness
Endoscopic partial fasciotomy is another option, per recent evidence

(Sources: Harrison's Principles of Internal Medicine 22E, p. 991; Textbook of Family Medicine 9e, p. 240-244; Miller's Review of Orthopaedics, p. 592; Tintinalli's Emergency Medicine, p. 277-279; Campbell's Operative Orthopaedics 15th Ed.)

Recent evidence (2024-2025 systematic reviews/meta-analyses) Current literature broadly supports the textbook approach but adds nuance:

A 2025 systematic review of physiotherapy interventions (PMID: 40596749) found various physical therapy modalities, including ESWT, effective for pain reduction.
A 2024 meta-analysis (PMID: 38395675) compared PRP against other modalities, suggesting PRP may offer comparable or superior outcomes to corticosteroid injection or ESWT in some trials, though evidence quality varies.
A 2025 systematic review of endoscopic treatment (PMID: 36342049) supports endoscopic partial fasciotomy as a reasonably effective option for recalcitrant cases.
Updated APTA/AOPT clinical practice guidelines (summarized in American Family Physician, 2025) emphasize manual therapy, dosed stretching/strengthening, and caution against using orthoses as a stand-alone treatment - they work better combined with other modalities.

These don't contradict the core textbook teaching but reinforce that stretching/loading exercises remain first-line (Grade A evidence), while orthotics/night splints are adjuncts (Grade B), and injections/surgery are reserved for refractory or acute flare situations.

When to worry about something else: Numbness/tingling, significant swelling, bruising, or pain unresponsive to typical patterns should prompt evaluation for tarsal tunnel syndrome, calcaneal stress fracture, nerve entrapment (e.g., first branch of the lateral plantar nerve/Baxter's nerve), or systemic rheumatologic disease.

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