BC-HEALTH-REPAIR-KNEECARTILAGE:MYO _ lifestyle (650 words) New technique for repairing knee cartilage damage From Mayo Clinic News Network Mayo Clinic News Network (TNS) Dear Mayo Clinic: I’m interested in the new procedure approved by the U.S. Food and Drug Administration that can repair cartilage in the knee. How does it work? Who’s a good candidate for this procedure? A: The new technique is called matrix-associated autologous chondrocyte implantation, or MACI.