CPT® Code 0350T

Radiologic examination, radiostereometric analysis (RSA); lower extremity(ies), (includes hip, proximal femur, knee, and ankle, when performed)

Radiostereometric analysis (RSA) is a specialized radiologic examination technique that utilizes two X-ray images taken from different angles simultaneously. This method incorporates previously implanted tantalum beads, which serve as reference points, to generate a detailed three-dimensional image. The primary purpose of RSA is to detect any skeletal movement or changes in the positioning of an implant over time. The tantalum beads can be inserted directly into the bone surrounding an implant or can be affixed in a stable position to a spinal cage that is placed in front of the patient. RSA is particularly valuable in assessing and monitoring the integrity of growth plates, evaluating the stability of total joint replacement implants, and examining spinal fusions. Additionally, it is employed for kinematic studies of various joints, including the knee, spine, and shoulder. For specific applications, different CPT codes are designated: CPT code 0348T is assigned for RSA of the spine (cervical, thoracic, and/or lumbosacral), while CPT code 0349T is used for RSA of the upper extremities (shoulder, elbow, and/or wrist). CPT code 0350T specifically pertains to RSA of the lower extremities, which includes the hip, proximal femur, knee, and ankle.