Knee Joint of a Patient (IMAGE) Radiological Society of North America Caption Knee joint of a patient showing (A) severe cartilage defects and (B) intact knee joint. Credit RSNA Usage Restrictions May use with credit. 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.