The Greulich and Pyle method is one of the two main ways to assess the bone age of children.
Both main methods of bone age assessment require a left hand and wrist radiograph. The Greulich and Pyle method makes use of a standard bone age atlas that the reporter can compare their image to and make an estimation of bone age.
This is different to the Tanner-Whitehouse method which assesses and scores each bone before calculating an estimated age based on the assessed bones.