Joint cartilage is the shiny white gristle covering the contact surfaces of the bones in articulating (moving) joints.

Normal joint cartilage of the knee, as observed during an arthroscopy.
Synonyms:
Hyaline cartilage
Articular cartilage
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CLINICAL PUBLICATIONS
Articular cartilage: structural and developmental intricacies and questions. Decker RS, Koyama E and Pacifici M. Curr Osteoporos Rep. 2015 Dec; 13(6): 407–414.