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, lateralfemoral 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, orautologous chondrocyte implantation (debridement and lavage are acceptable if theprocedure 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 toenrollment

11. The patient is currently being treated with radiation, chemotherapy,immunosuppression or systemic steroid therapy with a dose equivalent to more than 5mg 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 aresearcher/investigator/sponsor), or relative of someone directly involved in thestudy

14. Active infection of the index knee

15. Previous diagnosis of osteoporosis as diagnosed by DEXA, bone densitometry or CTscan

16. Any disorder or impairment that would interfere with evaluation of outcomesmeasures, such as neurological, degenerative muscular, psychiatric, or cognitiveconditions

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 withthe validity of the study

19. Known allergy to porcine collagen

20. Symptom duration greater than 36 months