A joint is a junction between two bones. Where the two bones can move in relation to one another this is called an 'articulation'.
Joint cartilage is the shiny white gristle covering the contact surfaces of the bones in articulating (moving) joints.
Abbreviation of 'juvenile rheumatoid arthritis'.
Juvenile rheumatoid arthritis is arthritis affecting a child (under 16) in several joints where evidence exists that the condition is autoimmune - that is that the child's own immune system is attacking the joints.
Same as Osgood Schlatter's disorder.