Bone and Indium scans are performed by removing some of your own blood and labeling it with an isotopic material that is then re-injected. You will return one day later and the area of the joint will be scanned. These tests help us evaluate for loosening of implants or for infection. The amount of radiation is generally not much more than a single x-ray exposure. Complications have been minimal. Computerized scanning is sometimes combined with injection of these agents to better define the changes in a three-dimensional way.