Structure C on a wrist radiograph corresponds to which carpal bone?

Structure C on a wrist radiograph corresponds to which carpal bone?

• A. Pisiform
• B. Lunate
• C. Triquetral
• D. Trapezium

Answer: (C)

Identifying carpal bones on a wrist radiograph comes down to where each bone sits in the proximal row. In the wrist, the proximal row from the thumb side toward the little finger goes: scaphoid, lunate, triquetral, then pisiform. The triquetral lies between the lunate and the pisiform. If Structure C is located between those two bones in the image, it is the triquetral bone. The pisiform sits on top of the triquetral and can obscure it a bit, the lunate is central, and the trapezium belongs to the distal row near the thumb, so their positions don’t match Structure C.

Identifying carpal bones on a wrist radiograph comes down to where each bone sits in the proximal row. In the wrist, the proximal row from the thumb side toward the little finger goes: scaphoid, lunate, triquetral, then pisiform. The triquetral lies between the lunate and the pisiform. If Structure C is located between those two bones in the image, it is the triquetral bone. The pisiform sits on top of the triquetral and can obscure it a bit, the lunate is central, and the trapezium belongs to the distal row near the thumb, so their positions don’t match Structure C.