Final answer:
The radiographic record obtained after a contrast medium is injected into a patient's joint is an X-ray. X-rays use ionizing radiation to produce images of the inside of the body, including the bones and joints.
Step-by-step explanation:
The radiographic record that is obtained after a contrast medium is injected into a patient's joint is an X-ray.
An X-ray uses ionizing radiation to produce images of the inside of the body, including the bones and joints. It is commonly used to diagnose joint conditions and assess the effectiveness of treatment.
Other medical imaging techniques mentioned in the options, such as CT scans, MRI, and ultrasound, do not require the use of a contrast medium to visualize joints.