Which bone is labeled F on a wrist radiograph?

Which bone is labeled F on a wrist radiograph?

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

Answer: (C)

On a wrist radiograph, the carpal bones form two rows. In the distal row (from the thumb side toward the little finger) the order is: trapezium, trapezoid, capitate, hamate. The bone labeled F sits between the trapezium and the capitate, near the base of the index finger. That position corresponds to the trapezoid, which is the second distal carpal bone and articulates with the second metacarpal. The trapezium sits more toward the thumb, and the capitate is central, so F isn’t those bones, but the one in the between position is the trapezoid.

On a wrist radiograph, the carpal bones form two rows. In the distal row (from the thumb side toward the little finger) the order is: trapezium, trapezoid, capitate, hamate. The bone labeled F sits between the trapezium and the capitate, near the base of the index finger. That position corresponds to the trapezoid, which is the second distal carpal bone and articulates with the second metacarpal. The trapezium sits more toward the thumb, and the capitate is central, so F isn’t those bones, but the one in the between position is the trapezoid.