Inflammation of the plantar fascia is called plantar fasciitis and is common in active or overweight individuals. It can be treated conservatively or surgically. Extracorporeal shock wave therapy has shown significant efficacy in the treatment of plantar fasciitis. Repeated chronic inflammation of the plantar fascia may lead to fibrous edema, thickening and even calcification in the fascia, resulting in thickening of the plantar fascia in patients with chronic plantar fasciitis and affecting the mechanical properties of the plantar fascia (changes in elastic modulus) ). Previous studies rarely involved changes in the elasticity of the plantar fascia before and after extracorporeal shock wave treatment.

Inclusion Criteria:

1. Pain at the proximal calcaneal stop of the plantar fascia
2. The pain is severe when waking up in the morning or standing and walking after sitting for a long time, and it is slightly relieved after activities, and it will be aggravated after long walking or standing for a long time
3. Pain time> 3 months
4. Visual Scoring Scale (VAS)>4
5. The pain is tingling, sore, or burning, etc
6. There is or no tender point at the bottom of the arch of the foot
7. The patient has not undergone corticosteroid injection therapy or shock wave therapy or surgery
8. X-ray confirmed no calcaneal spurs
9. The patient agrees to participate in this study

Exclusion Criteria:

1. Suffering from calcaneal stress fracture, atrophy of fat pad, compression of the little toe abductor nerve (Baxter's nerve), tarsal tunnel syndrome, sciatica, bone or soft tissue tumor, rheumatism or rheumatoid arthritis, rigidity Those with spondylitis and infection
2. those who disagree with and do not understand the treatment methods or methods of the experiment
3. those with mental disorders