trochoid joint

Medical Dictionary

trochoid joint n.
A joint in which a section of a cylinder of one bone fits into a corresponding cavity on the other, as in the proximal articulation between the radius and ulna. Also called pivot joint, rotary joint.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

trochoid joint

in vertebrate anatomy, a joint that allows only rotary movement. It is exemplified by the joint between the atlas and the axis (first and second cervical vertebrae), directly under the skull, which allows for turning of the head from side to side. Pivot joints also provide for the twisting movement of the bones of the forearm (radius and ulna) against the upper arm, a movement used, for instance, in unscrewing the lid of a jar

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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