"Greulich and Pyle atlas presents a single standardised image for a range of ages of each gender 2"
"Tanner-Whitehouse (TW) method involves the scoring of each carpal bone, the radius and ulna, leading to a total score, from which age can be estimated 3"
"In addition, software tools are available to automate the task of bone age assessment. In 2017, the RSNA held a machine learning challenge to automate bone age assessment. The winning model achieved a mean absolute difference from the gold-standard (the average of a panel of paediatric radiologists) of 4.265 months 4."