sellar joint
anatomy
Quick Summary
A sellar joint, also known as a saddle joint, is a type of synovial joint that allows for two types of movement: flexion-extension and abduction-adduction. It also permits combined movements, including rotation. A prime example of a sellar joint is the carpometacarpal joint of the thumb, which enables the thumb's unique ability to oppose the fingers, a movement crucial for grasping and manipulation. This oppositional movement involves rotation around the thumb's long axis.1
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