pivot joint

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Definitions from WordNet

Noun pivot joint has 1 sense

pivot joint, rotary joint, rotatory joint, articulatio trochoidea - a freely moving joint in which movement is limited to rotation; "the articulation of the radius and ulna in the arm is a pivot joint"
--₁ is a kind of synovial joint, articulatio synovialis, diarthrosis

Definitions from the Web

Pivot Joint

A pivot joint is a type of synovial joint that allows rotational movement. It consists of a cylindrical bone that rotates within a ring formed by another bone or ligament.

Senses and Usages:

Medical sense: In anatomy, a pivot joint refers to a specific joint type allowing rotational movement, such as the joint between the atlas and axis bones in the neck.
General sense: Pivot joint can also be used more generally to describe any joint that enables rotational movement.

Examples:

Medical sense:

The pivot joint between the atlas and axis allows for the rotational motion of the head.
An injury to the pivot joint in his neck caused restricted movement.

General sense:

The dancer's hip acts as a pivot joint, allowing her to execute precise spins effortlessly.
A loose pivot joint in a door can result in unstable movement.