Making Back Surgery Safer (IMAGE) Dartmouth College Caption This is an exposed spine with ligamentous structures intact and bone mini-screws implanted. An attached reference frame is also visible. Credit Dartmouth College 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.