单词	ball-and-socket joint
释义	ball-and-socket joint noun ball-and-sock·​et joint ˈbȯl-ən(d)-ˈsä-kət-  1 : a joint in which a ball moves within a socket so as to allow rotary motion in every direction within certain limits 2 : an articulation (such as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction Illustration of ball-and-socket joint ball-and-socket joint 1 Example Sentences Recent Examples on the Web The shoulder is a ball-and-socket joint that is mobile, but also unstable. Jen Murphy, WSJ, 15 Jan. 2022 The columns are substantial but are linked to the roof only with a daringly thin ball-and-socket joint. Anthony Paletta, WSJ, 14 Jan. 2022 The seven vertebrae in her neck—the same number as in a human’s—are connected by ball-and-socket joints like those in our shoulders, so instead of lifting up like a rigid beam, her neck snakes upward in an almost reptilian way. Ed Yong, The Atlantic, 13 Mar. 2020 Its third digit, which is primarily used for tapping, is very thin and has a wide range of motion, equipped with a unique ball-and-socket joint. National Geographic, 21 Oct. 2019 The latching system is based on a ball-and-socket joint. Martin Finucane, BostonGlobe.com, 6 June 2019 Unlike a hinge joint that moves only (for the most part) forward and backward, like the knee, the shape of the ball-and-socket joint in the hip allows for flexion, extension, internal and external rotation, abduction, and adduction. SELF, 22 Feb. 2019 And your shoulders specifically may benefit immensely from rotator cuff exercises, which strengthen and stabilize the small muscles that help keep the ball-and-socket joint in place. Amy Marturana, SELF, 2 Nov. 2018 The ball of this ball-and-socket joint had been flattened by wear and tear, and its no-longer-smooth surface was now in direct contact with the bony cup of the socket. Lisa Sanders, New York Times, 27 June 2018 See More Word History First Known Use 1779, in the meaning defined at sense 1 Kids Definition ball-and-socket joint noun : a joint (as in the shoulder) in which a rounded part can move in many directions in a socket Medical Definition ball-and-socket joint noun : an articulation (as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction called also enarthrosis
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