Which joint type enables movement in two planes, including flexion/extension and abduction/adduction?

Which joint type enables movement in two planes, including flexion/extension and abduction/adduction?

• A. Condyloid joint
• B. Hinge joint
• C. Ball-and-socket joint
• D. Pivot joint

Answer: (A)

Movement in two planes, including flexion/extension and abduction/adduction, is a feature of biaxial joints. The condyloid joint fits this because one bone has an oval-shaped end that sits in an oval cavity of the adjacent bone, allowing movement in two directions: bending and straightening (flexion/extension) and moving away from or toward the midline (abduction/adduction). Examples include the wrist (radiocarpal joint) and the finger joints (metacarpophalangeal joints). In contrast, hinge joints move mainly in one plane (flexion/extension), pivot joints rotate around a single axis, and ball-and-socket joints allow movement in multiple planes, including rotation. So the condyloid joint is the correct type.

Movement in two planes, including flexion/extension and abduction/adduction, is a feature of biaxial joints. The condyloid joint fits this because one bone has an oval-shaped end that sits in an oval cavity of the adjacent bone, allowing movement in two directions: bending and straightening (flexion/extension) and moving away from or toward the midline (abduction/adduction). Examples include the wrist (radiocarpal joint) and the finger joints (metacarpophalangeal joints). In contrast, hinge joints move mainly in one plane (flexion/extension), pivot joints rotate around a single axis, and ball-and-socket joints allow movement in multiple planes, including rotation. So the condyloid joint is the correct type.