Which carpal bone does structure B label on a wrist radiograph?

Which carpal bone does structure B label on a wrist radiograph?

• A. Hamate
• B. Lunate
• C. Triquetral
• D. Scaphoid

Answer: (B)

Recognize carpal bones by their position and shape on a wrist radiograph. In the proximal row, the lunate sits centrally between the scaphoid on the thumb side and the triquetral on the little-finger side, and it aligns with the radius. It has a smooth, moon-like (crescent) outline that makes it stand out among the nearby bones. If the labeled structure is the bone between the scaphoid and the triquetral and in line with the radius, that is the lunate. The scaphoid is more radial and often shows a noticeable tubercle, the triquetral is more medial and smaller (often overlapped by the pisiform), and the hamate belongs to the distal row on the ulnar side.

Recognize carpal bones by their position and shape on a wrist radiograph. In the proximal row, the lunate sits centrally between the scaphoid on the thumb side and the triquetral on the little-finger side, and it aligns with the radius. It has a smooth, moon-like (crescent) outline that makes it stand out among the nearby bones. If the labeled structure is the bone between the scaphoid and the triquetral and in line with the radius, that is the lunate. The scaphoid is more radial and often shows a noticeable tubercle, the triquetral is more medial and smaller (often overlapped by the pisiform), and the hamate belongs to the distal row on the ulnar side.