Dr. David Greenberg and Dr. Rajiv Chopra (IMAGE) UT Southwestern Medical Center Caption Dr. David Greenberg, left, and Dr. Rajiv Chopra have shown that a coil magnet wrapped around a prosthetic knee can destroy bacterial biofilm on the artificial knee. Credit UT Southwestern Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.