Clinical Study of Chondro-Gide® for Large Chondral Lesions in the Knee

Inclusion Criteria: 1. Signed written informed consent 2. One symptomatic knee with cartilage defect on the medial femoral condyle, lateral femoral condyle, or trochlea, identified MRI or arthroscopy 3. Between 18 and 55 years of age 4. Subject is willing and able to comply with all study procedures, including visits, diagnostic procedures, and the rehabilitation protocol Exclusion Criteria: 1. BMI ≥ 30 kg/m2 2. Symptomatic contralateral knee 3. Diagnosis of radiographic osteoarthritis with Kellgren-Lawrence grade 3 or more 4. Prior surgical treatment of the cartilage using microfracture, mosaicplasty, or autologous chondrocyte implantation (debridement and lavage are acceptable if the procedure was at least 3 months prior to enrollment) 5. Patella dysplasia 6. Chronic inflammatory arthritis or infectious arthritis 7. History of autoimmune disease or immunodeficiency 8. History of connective tissue disease 9. Intra-articular steroid use within the 3 months prior to enrollment 10. Other intra-articular injections (e.g. hyaluronic acid) within 3 months prior to enrollment 11. The patient is currently being treated with radiation, chemotherapy, immunosuppression or systemic steroid therapy with a dose equivalent to more than 5 mg prednisolone 12. Pregnancy or lack of adequate contraceptives if a female of child-bearing potential 13. Enrolled in another study, involved in the study (as a researcher/investigator/sponsor), or relative of someone directly involved in the study 14. Active infection of the index knee 15. Previous diagnosis of osteoporosis as diagnosed by DEXA, bone densitometry or CT scan 16. Any disorder or impairment that would interfere with evaluation of outcomes measures, such as neurological, degenerative muscular, psychiatric, or cognitive conditions 17. History or current substance or alcohol abuse as defined by the DSM-V 18. Any other medical condition that the investigator determines would interfere with the validity of the study 19. Known allergy to porcine collagen 20. Symptom duration greater than 36 months