I spent 4 months researching this tricky injury, including reading every post on every thread here. Other runners were a big help. I finally had surgery in January 2006. I just realized I should have writren a follow up report for the benefit of others.
* "Sports Hernia" isn't a hernia; the term thus causes much confusion right away, as the sufferer is ignored as being wrong or steered in the wrong direction.
* Whatever causes groin pain probably stems from a variety of problems, which should be treated in a variety of ways, further complicating the issue.
* What I had, and many others I think, is a partial separation of the Rectus Abdominus from the Pubic bone. This does not show up on a MRI, unless contrast solution is injected and the radiologist is told to look for it.
* Core stengthening and better running form helps mitigate the condition and may be all you need. Rest actually accomplishes nothing, except frustration and time wasting, as it doesn't hurt when you rest, but starts right back again as soon as you move, because nothing has healed; white tissue does not re-attach itself to bone. Forget it. So if it's bad, you need surgery, period.
* I went to Dr Cattey in Milwaukee. After months of uncertainty, in 10 minutes he knew all about it and the next day in about 90 minutes he fixed it.
* Cattey placed a 4" square polypro mesh over the muscle and bone; the muscle intertwines with the mesh, and tacks hold the other end to the pubic bone.
* I went for a 2 hr walk the next day. In 2 weeks I jogged. In 4 weeks I couldn't tell it ever happened (except I was out of shape from taking 6 months off). End of problem.
* While in Milwaukee, I saw soccer and hockey players waltzing on in, without having blown 6 months agonizing about it. Their coach just said, "You have a sports hernia (sic); here's where you go to get rid of it; see you in a couple weeks on the practice field".
I hope your issues are resolved as easily as mine (finally) were.