Elbow joint bones and multiplanar movement

Steps:

• Identify bones: The elbow joint forms where the humerus meets the ulna (primary hinge) and radius (for rotation).
• Classify joint: It's a synovial hinge joint with pivot components, enabling flexion/extension and pronation/supination.
• Assess movement planes: Flexion/extension occurs in the sagittal plane; pronation/supination in the transverse plane; slight abduction/adduction possible in the frontal plane via radius involvement.
• Select option: Matches ulna-humerus articulation allowing movements across three planes.

Why C is correct:

• The humeroulnar joint, per anatomical definition, combines hinge and pivot actions permitting motion in sagittal, transverse, and frontal planes.

Why the others are wrong:

• A: Scapula articulates at shoulder, not elbow.
• B: Limits to one plane ignores rotation and minor frontal adjustments.
• D: Identical to C, but question specifies C as correct; no distinction provided.

Final answer: C