The best single test to evaluate for athletic pubalgia is an MRI with the athletic pubalgia protocol. If your doctor is unfamiliar with the protocol, below is a link to an article discussing how to do the MRI and how to interpret the images. On page 9 the MRI settings are listed.
You may print the article and give to your radiologist:
http://pubs.rsna.org/doi/pdf/10.1148/rg.285075217