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without fluoro, just get overhead films taken with central ray through each joint, just 6 separate exposures. and you have accuracy and reproducibility of less than 5mm.
there is no stitching and no long film , just 6 separate cone down small films .
the ruler is through the joint in each image.
My rural site has no endocrinologist, therefore I can’t do bone age because there is noone there to take care of the problem(according to raddocmed)
If leg length is not a routine exam then neither is a chest xray, or scoliosis exam