Bone age imaging is obtained from radiographs of which locations?

• A. Knees or left wrist
• B. Right elbow
• C. Pelvis
• D. Skull

Answer: (A)

Bone age imaging relies on radiographs that reflect skeletal maturation at growth centers. The most reliable and widely used site is the left hand and wrist, because many ossification centers there progress in a well-defined sequence that correlates with chronological age, and there are standardized reference methods (like Greulich and Pyle or Tanner-Whitehouse) to compare against. If imaging the left hand and wrist isn’t possible, the knee can serve as an alternative because its growth plates—such as the distal femur and proximal tibia—also show maturation patterns that researchers have correlated with age. The elbow, pelvis, and skull do not provide the same standardized, widely accepted correlation with overall skeletal maturity, so they aren’t used for routine bone age assessment. Thus, bone age imaging is obtained from radiographs of the knees or left wrist.