Saddle joint

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A saddle joint (sellar joint, articulation by reciprocal reception) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex. It is found in the thumb, the thorax, the middle ear, and the heel.

Excerpt from the Wikipedia article “Saddle joint”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Produnis, CC BY-SA 3.0, via Wikimedia Commons.