Vijaya Knight, National Jewish Health (IMAGE) MediaSource Caption Vijaya Knight M.D., Ph.D., National Jewish Health in Denver, is pictured working with blood vials. A growing number of patients are learning they are allergic to the metal used in knee or hip implants or to the bone cement used in surgery. A new study by National Jewish Health is touting the benefits of a blood test to help avoid painful complications. Credit National Jewish Health 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.