Efficacy and Safety of Chondron (Autologus Chondrocyte) in Patients With Cartilage Defects in Their Ankle

Inclusion Criteria: * 1\. Adult men and women over 15 and less than 65 years of age 2. Applicable to patients who have a partial cartilage defect in their ankle based on an MRI (defect size: for a single lesion, less than 15 cm2; and for multiple lesions, less than 20 cm2) 3. Patients with ankle-tibia malalignment of the ankle joint, unstable ankle ligaments, bone defects at the cartilage defect area or patients who received correction in advance 4. Patients which surrounding cartilage are normal 5.Patients with a Grade III or IV cartilage defect size on the ICRS (International Cartilage Repair Society) 6. Patients who agreed to clinical trial participation voluntarily or by the will of the person in parental authority, and signed the written consent form Exclusion Criteria: * 1\. Patients hypersensitive to bovine protein 2. Patients hypersensitive to gentamicin antibiotics 3. Patients with inflammatory arthritis such as rheumatoid arthritis, gout arthritis 4. Patients with arthritis related to autoimmune disease 5. Pregnant, breast-feeding patients or those who have a possibility of pregnancy 6. Patients with accompanying diseases other than articular cartilage defects, including tumors 7. Patients who have a history of receiving radiotherapy, chemotherapy in the last 2 years 8. Patients with diabetes (however, patients whose blood sugar test results are normal and do not have any complication of diabetes, when a written opinion that CHONDRON administration is possible is appended by a doctor are excluded) 9. Patients who are administering antibiotics and antimicrobial agents due to infection 10. Patients who receive steroid hormone therapy 11. Patients with psychiatric disorder and those who are considered to be inappropriate for this trial by the judgment of the clinical trial manager