http://media.soundmedicine.org/segments/110313_3.mp3
As humans age, articular cartilage -- the smooth white tissue that covers the ends of bones where they form joints -- can become damaged. The damaged tissue cannot be repaired and can lead to chronic knee, hip and other joint pain. Stephen Trippel, M.D., is a cartilage growth and repair expert who joins “Sound Medicine” to discuss his research, the effects of damaged cartilage and why cartilage repair is so tricky.