<unk> (intraarticular) is a cartilaginous defect repair agent that is FDA approved for the treatment of osteoarthritis of knee.   Common adverse reactions include injection site pain, injection site reaction, arthralgia.
Hyaluronic acid 
Chondroitin sulfate
Sarcoglycan
Heparan sulfate
Dermatan sulfate
Fibrous protein
Glycoprotein
Glycosaminoglycan