Vanderbilt’s Scott Arthur, M.D., recently performed the state’s first knee surgery using a newly approved implant containing a patient’s regrown cartilage cells.

Trademarked under the name MACI, the implant was approved by the U.S. Food and Drug Administration in December. It is the first FDA-approved product that regrows knee cartilage cells on scaffolds. Previously, this type of regenerative therapy, which entails extracting healthy cartilage cells from a patient’s knee then re-growing them in a laboratory, was available only in liquid form.