Which joint is a biaxial joint that allows flexion, extension, abduction, adduction, and circumduction, such as at the base of the thumb?

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Multiple Choice

Which joint is a biaxial joint that allows flexion, extension, abduction, adduction, and circumduction, such as at the base of the thumb?

Explanation:
Two axes of movement aligned with two distinct planes are needed for a joint to be biaxial and to perform flexion, extension, abduction, adduction, and circumduction. The saddle joint fits this requirement because its articular surfaces are reciprocally concave and convex, allowing motion in two perpendicular directions. At the base of the thumb, the carpometacarpal joint between the trapezium and the first metacarpal is classically described as a saddle joint. This arrangement enables flexion/extension in one plane and abduction/adduction in the other, and the combination of these movements produces circumduction. It also underpins the thumb’s distinctive ability to oppose. Hinge joints are uniaxial and permit only flexion and extension. Pivot joints are uniaxial and primarily allow rotation. Condyloid joints are biaxial and can perform similar movements, but the specific saddle-shaped articulation at the thumb base is the classic example of a saddle joint, making it the best fit for this description.

Two axes of movement aligned with two distinct planes are needed for a joint to be biaxial and to perform flexion, extension, abduction, adduction, and circumduction. The saddle joint fits this requirement because its articular surfaces are reciprocally concave and convex, allowing motion in two perpendicular directions. At the base of the thumb, the carpometacarpal joint between the trapezium and the first metacarpal is classically described as a saddle joint. This arrangement enables flexion/extension in one plane and abduction/adduction in the other, and the combination of these movements produces circumduction. It also underpins the thumb’s distinctive ability to oppose.

Hinge joints are uniaxial and permit only flexion and extension. Pivot joints are uniaxial and primarily allow rotation. Condyloid joints are biaxial and can perform similar movements, but the specific saddle-shaped articulation at the thumb base is the classic example of a saddle joint, making it the best fit for this description.

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