The patient was a 9 year old boy. Of course his bone density would be lower than average for a young adult! There are several published data results of bone densities in children, but I have not yet met a radiologist who has taken the time to look them up and compare the results to the appropriate age. In this case, the patient's bone density was average (z-score = 0) and his wrist fracture was probably the result of normal growth and usual rambunctiousness.
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