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Caffey's landmark article of 1946 noted an association between healing long-bone fractures and chronic subdural hematomas in infancy, and it was the first to draw attention to physical abuse as a unifying etiology.
Since these early reports, investigators have more clearly defined the pathophysiology of abusive injuries (see the images below).
Approximatley 9% of reports were submitted by medical personnel.
The series includes frontal and lateral views of the skull, frontal and lateral views of the spine, frontal views of the chest (ribs) and pelvis, and frontal views of the extremities, including the hands and feet.
For inorganic matter and for older materials, isotopes of other elements, such as potassium, uranium, and strontium, are used.
Radiometric dating measures the decay of radioactive atoms to determine the age of a rock sample.