Choi JA, et al. - Experts aspired to explore whether the capitohamate (CH) planimetry could be a reliable indicator of bone age, and to compare it with Greulich-Pyle (GP) method. Three hundred ninety-one children (age, 1–180 months) were included in this retrospective study. They defined CH planimetry as the measurement of the sum of areas of the capitate and hamate. Data revealed that radiography of the left hand was widely used to estimate bone age. According to the findings obtained, CH planimetry could be a reliable method for bone age assessment.