After an arthrogram how quickly should the mri study be done?

MR arthrogams are done in two steps. Step 1. A direct injection is done into the joint using a needle, diluted contrast, and fluoroscopy guidance. The procedure can take anywhere between 15-45 minutes depending on the degree of difficulty in accessing the joint space. Step 2. An MRI is performed with sequences and positioning specifically tailored for the arthrogram. The arthrogram is usually performed between 30 and 45 minutes after injection in Step 1, though can be done up to 3 hours later if planned accordingly and with a less dilute contrast given during Step 1.