The metocarpophalangeal joints (knuckles) are examples of which type of joint? A) Hinge joint B) Ball-and-socket joint C) Condylar joint D) Pivot joint

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1. The metacarpophalangeal joints, commonly known as knuckles, allow movement in two planes (flexion-extension and abduction-adduction), which is characteristic of a condyloid joint.

2. A condyloid joint is one where an oval-shaped (ellipsoidal) articular surface of one bone fits into a complementary depression in another bone, allowing for biaxial movement.

3. In contrast, hinge joints (e.g., the elbow joint) permit movement in only one plane, ball-and-socket joints (e.g., hip joint) allow movement in multiple planes including rotation, and pivot joints (e.g., the radioulnar joint) permit only rotational movement.

Thus, the metacarpophalangeal joints are examples of a condylar (condyloid) joint.

$$
\textbf{Answer: C) Condylar joint}
$$
The metacarpophalangeal joints (knuckles) are examples of a condylar joint.

The metocarpophalangeal joints (knuckles) are examples of which type of joint? A) Hinge joint B) Ball-and-socket joint C) Condylar joint D) Pivot joint

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