Which carpal bone is labeled as structure H on the wrist?

Which carpal bone is labeled as structure H on the wrist?

• A. Hamate
• B. Trapezium
• C. Trapezoid
• D. Capitate

Answer: (A)

The structure is the hamate. On a wrist radiograph, carpal bones form two rows. In the distal row, from the thumb side to the little finger side, the order is trapezium, trapezoid, capitate, then hamate. The hamate sits on the ulnar (little finger) side of the distal row and has a distinctive hook-like projection on its palmar surface, called the hamulus. That hook is a telltale feature that helps confirm its identity, and its position is just medial to the capitate, nearby the bases of the 4th and 5th metacarpals. So a structure labeled on the ulnar side of the distal carpal row, with a palpable hook, corresponds to the hamate.

The structure is the hamate. On a wrist radiograph, carpal bones form two rows. In the distal row, from the thumb side to the little finger side, the order is trapezium, trapezoid, capitate, then hamate. The hamate sits on the ulnar (little finger) side of the distal row and has a distinctive hook-like projection on its palmar surface, called the hamulus. That hook is a telltale feature that helps confirm its identity, and its position is just medial to the capitate, nearby the bases of the 4th and 5th metacarpals. So a structure labeled on the ulnar side of the distal carpal row, with a palpable hook, corresponds to the hamate.