Plantar fascitis
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"plantar fasciitis"[MeSH Terms] AND treatment
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Excellent content from multiple authoritative sources. Here is the complete overview:
Plantar Fasciitis
Definition & Anatomy
Plantar fasciitis is the most common cause of plantar heel pain in adults. The plantar fascia is a fibrous band originating at the medial calcaneal tuberosity, fanning across the plantar foot, and splitting to insert into the plantar aspects of the proximal phalanges. Despite the "-itis" name, it is now understood to be primarily a degenerative condition (fasciosis) driven by chronic microtears and repetitive loading, rather than true acute inflammation.
- Miller's Review of Orthopaedics, p. 592
- Textbook of Family Medicine 9e
Pathophysiology
Repeated microtears at the origin of the plantar fascia initiate an injury-repair cycle, leading to a traction enthesophyte (heel spur). The condition is strongly associated with gastrocnemius-soleus contracture, which increases tensile stress on the fascia during the push-off phase of gait.
Key point: heel spurs are a consequence, not the cause, of plantar fasciitis and have little independent diagnostic significance.
Risk Factors
| Factor | Notes |
|---|---|
| BMI > 30 kg/m² | Single biggest risk factor |
| Pes planus (flat foot) | Reduces arch shock absorption |
| Pes cavus (high arch) | Increases fascia tension |
| Limited ankle dorsiflexion | Tightens fascial origin on push-off |
| Prolonged standing / walking on hard surfaces | Overuse mechanism |
| Running (especially on harder surfaces) | Sudden change in training surfaces |
| Faulty footwear | Lack of arch support |
Clinical Presentation
- Sharp, stabbing heel pain worst with first steps in the morning or after prolonged inactivity ("post-static dyskinesia")
- Pain typically improves with walking but worsens again with prolonged activity
- Pain increased by walking barefoot or climbing stairs
- Bilateral in a significant subset of patients
Physical exam: Point tenderness over the medial plantar tuberosity of the calcaneus at the proximal fascia insertion. Passive dorsiflexion of the toes (windlass test) may reproduce symptoms.
A small subset has pain from entrapment of the first branch of the lateral plantar nerve (Baxter's nerve) - this should be considered if symptoms are refractory.
Diagnosis
Primarily clinical - history and exam alone are usually sufficient.
- X-rays (weight-bearing): First imaging step; may show heel spur (not diagnostic); excludes stress fracture, tumor, subtalar arthritis
- Ultrasound: Shows fascia thickening (>4 mm) and hypoechogenicity at calcaneal insertion - useful and inexpensive
- MRI: Sensitive - shows fascia thickening and surrounding edema; not routinely required but helpful in atypical or refractory cases
Treatment
Nonoperative (effective in 90-95% within 12 months)
First-line:
- Plantar fascia-specific stretching and Achilles/heel cord stretching - cornerstone of treatment
- Ice/heat, massage
- Cushioned heel inserts / medial arch orthotics
- NSAIDs - analgesic benefit (note: condition is not truly inflammatory, so benefit is likely analgesic rather than anti-inflammatory)
- Activity modification - eliminate inciting activities
Second-line:
- Night splints (keep ankle at neutral/slight dorsiflexion to prevent fascial contracture during sleep)
- Foot taping/strapping
- Physical therapy
- Walking casts (for severe cases)
- Corticosteroid injection: Provides short-term relief (~1 month), but risk of plantar fascia rupture increases significantly; risk of rupture rises after ~2.67 injections; also causes fat pad atrophy. Review risks with patients before proceeding.
Emerging/adjunct:
- Platelet-rich plasma (PRP) injection - promising in limited studies
- Extracorporeal shock wave therapy (ESWT) - mixed results in studies; used in refractory cases before surgery
- Prolotherapy, dry needling, autologous blood injection - under investigation; not consistently proven
Operative (< 5% of cases)
Indicated only after 6-12 months of failed conservative treatment.
- Limited (medial half) plantar fasciotomy - preferred approach
- Avoid complete fasciotomy - risks arch collapse, lateral column overload, dorsolateral foot pain, metatarsal stress fractures
- Concomitant release of deep fascia of abductor hallucis if lateral plantar nerve entrapment is suspected
- Gastrocnemius recession - consider if there is clear gastrocnemius contracture without ankle equinus
Prognosis
- Resolution within 12 months in >80-95% of patients regardless of specific treatment
- Condition is self-limiting in the vast majority
Sources:
- Miller's Review of Orthopaedics 9th Edition, p. 592
- Harrison's Principles of Internal Medicine 22E (2025)
- Textbook of Family Medicine 9e
- Goldman-Cecil Medicine
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