the Safety and Efficacy of Collagen Injection in Patients With Plantar Fasciitis

Inclusion Criteria: \- 1. Patient with chronic plantar fasciitis (Patients who had been diagnosed with plantar fasciitis but had not been responsive to non-invasive treatment for more than three months (non-invasive treatments include drugs, physiotherapy shock wave, or stretching) 2. Patients who are able to complete the questionnaires related to the safety and efficacy of the study drug and who read and understood the guidelines 3. Patients who agreed to maintain the medication dose during the study period if they need to keep taking it. (Excluded anti-inflammatory analgesic drug for pain after the injection.) 4. Patients who agreed not to use physical therapy or shock wave during the study period. 5\. Patients or their representative (for adults), or patients and their parent/guardian (for minors), who agreed to participate in the study and signed the informed consent form Exclusion Criteria: * 1\. If patients or their families suffer from or have ever suffered from an autoimmune disease. 2\. Patients who have ever suffered an anaphylactic reaction. 3. Patients who have ever suffered hypersensitivity to an implant. 4. Patients with a history of allergy to porcine or bovine protein. 5. Patients with rheumatoid arthritis. 6. Patients with ankylosing spondylitis. 7. Patients who are suspected of having spinal deformity with a negative serum test 8. Subjects who are pregnant and/or breast-feeding and/or plan a pregnancy. 9. Subjects with psychiatric disorders who are considered inappropriate to participate in this trial by the Principal Investigator.