The AP knee for a hypersthenic patient requires the central ray to be directed:
3-5 degrees caudal to the femorotibial joint
10 degrees cephalic to the femorotibial joint
perpendicular to the femorotibial joint
5 degrees cephalic to the femorotibial joint
5 degrees cephalic to the femorotibial joint
Rationale: The hypersthenic patient measures greater than 24 cm from the ASIS to the tabletop which elevates the patient's leg and tibial plateau. In order for the CR to pass parallel to the tibial plateau, the tube is angled 5 degrees cephalic.
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