What imaging technique is commonly obtained before joint surgery and may involve the injection of contrast media?

The commonly obtained imaging technique before joint surgery that may involve the injection of contrast media is the arthrogram. An arthrogram is a radiographic image of a joint that is created by injecting a contrast dye into the joint space. This process helps to enhance the visibility of the structures within the joint, such as ligaments, cartilage, and tendons, allowing for detailed assessment of any abnormalities or injuries that may warrant surgical intervention.

In contrast to other options, arthroplasty refers to a surgical procedure to replace or reconstruct a joint, while arthrolysis involves the surgical release of a joint capsule or adhesions. Arthrotomy is a surgical procedure that involves cutting into the joint to access its internal structures but does not pertain to imaging. Therefore, the arthrogram is the specific imaging technique that fits the description in the question.