Fibrous joints are connected by dense connective tissue, consisting mainly of collagen. In these joints the bones are firmly interlocked by irregular hacksaw-like edges. These are fixed joints where bones are united by a layer of white fibrous tissue of varying thickness. The joints between the bones are called sutures. Such immovable joints are also referred to as synarthrosis.

A joint or articulation (or articular surface) is the location at which bones connect. They are constructed to allow movement (except for skull, sacral, sternal, and pelvic bones) and provide mechanical support, and are classified structurally and functionally.

"Joint", stylized as "JOINT", is the fifth maxi single by Japanese J-pop artist Mami Kawada, with both its A-side and B-side featured in her 2008 Savia album. It contains four tracks in both regular and instrumental versions and spans 17:40. Both its A-side and B-side tracks are featured as opening and ending themes for the second season of the anime series Shakugan no Shana. Geneon Entertainment released the single on October 31, 2007 in both a regular CD release and a limited CD and DVD that featured the music video for the track "Joint" bearing the catalog numbers GNCA-86 and GNCA-85 respectively.