I prefer to inject air rather than commercial contrast material since I believe that air is safer. Other doctors ask me how I can be sure that the injection is going in the right place with just using air, they ask how can you see the air. Here is an example of a recent patient with an air arthrogram of the hip:
|Right Hip Air Arthrogram|
In this case the patient was highly satisfied with the steroid injection and had relief of hip pain.