CPT® Code 77073

Bone length studies, as defined by CPT® Code 77073, are specialized radiographic procedures aimed at measuring the lengths of long bones in the skeletal limbs. This method is particularly useful for assessing limb length discrepancies, which can be critical for diagnosing various orthopedic conditions. Unlike external observational measurements, which may lack precision, bone length studies provide a more accurate assessment through the use of radiographic films. The classic technique known as the orthoroentgenogram involves taking three separate radiographic exposures of the hip, knee, and ankle joints, allowing for a comprehensive evaluation of limb length. Alternatively, a scanogram is employed, which utilizes a reduced exposure size to capture all three joint images on a single film cassette, streamlining the process. Additionally, the teleoroentgenogram is a variation that consists of a single anteroposterior radiograph that incorporates a ruler within the image, facilitating direct measurement of the bone lengths. These methodologies are essential for clinicians to determine the extent of limb length inequality and to plan appropriate interventions.