joint

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The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

joint in anatomy, juncture between two bones. Some joints are immovable, e.g., those that connect the bones of the skull, which are separated merely by short, tough fibers of cartilage. Movable joints are found for the most part in the limbs. Hinge joints provide a forward and backward motion, as at the elbow and knee. Pivot joints permit rotary movement, like the turning of the head from side to side. Ball-and-socket joints, like those at the hip and shoulder, allow the greatest range of movement, as the rounded end of one bone fits into the hollow or socket of another bone, separated by elastic cartilage. Joints can further be classified as fibrous, cartilaginous, and synovial. Collagen fibers connect fibrous joints. Synovial joints ease movement through the use of a lubricating liquid, supplied by the synovial membrane that lines movable joints. In synovial joints, a cushioning sac known as a bursa contains the fluid, which lubricates and nourishes the joint. Those joints which lack synovial fluid are nourished by blood. Holding the joints in place are strong ligaments fastened to the bones above and below the joint. Joints are subject to sprains and dislocations, as well as to infections and disorders caused by such diseases as arthritis . In recent years, the use of artificial joints has become increasingly common, particularly in hip and knee replacement. Many orthopedic surgeons now perform operations of this sort, using metal or plastic replacement joints in order to relieve pain, or to prevent or correct joint deformity.

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jointing

A Dictionary of Architecture and Landscape Architecture | 2000 | | © A Dictionary of Architecture and Landscape Architecture 2000, originally published by Oxford University Press 2000. (Hide copyright information) Copyright

jointing. Completion of joints in brickwork or masonry while the mortar is still soft, in contrast to pointing. See also brick.

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Brunskill (1990)

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JAMES STEVENS CURL. "jointing." A Dictionary of Architecture and Landscape Architecture. Oxford University Press. 2000. Encyclopedia.com. 14 Nov. 2009 <http://www.encyclopedia.com>.

JAMES STEVENS CURL. "jointing." A Dictionary of Architecture and Landscape Architecture. Oxford University Press. 2000. Encyclopedia.com. (November 14, 2009). http://www.encyclopedia.com/doc/1O1-jointing.html

JAMES STEVENS CURL. "jointing." A Dictionary of Architecture and Landscape Architecture. Oxford University Press. 2000. Retrieved November 14, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O1-jointing.html

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