Which bone articulates with the humerus at the elbow to form the hinge joint?

Which bone articulates with the humerus at the elbow to form the hinge joint?

• A. Radius
• B. Ulna
• C. Scaphoid
• D. Humerus

Answer: (B)

The elbow’s hinge action is mainly between the humerus and the ulna. The ulna has a large trochlear notch that fits the humeral trochlea, forming the primary hinge joint that allows flexion and extension of the forearm. The radius also touches the humerus at the capitulum and interacts with the ulna, but it does not create the hinge connection with the humerus. The scaphoid is a wrist bone, far from the elbow, and the humerus itself is the upper arm bone, not the bone that articulates to form this hinge.

The elbow’s hinge action is mainly between the humerus and the ulna. The ulna has a large trochlear notch that fits the humeral trochlea, forming the primary hinge joint that allows flexion and extension of the forearm. The radius also touches the humerus at the capitulum and interacts with the ulna, but it does not create the hinge connection with the humerus. The scaphoid is a wrist bone, far from the elbow, and the humerus itself is the upper arm bone, not the bone that articulates to form this hinge.