The input is much appreciated. It's on my right side. I have a definite imbalance in my gait. It probably comes from running on sloped surfaces alot, but it has not caused me problems before. It is really difficult to identify the muscles involved, but it is definitely adductors. The best way to reproduce the ab pain is to lie on my back and do a crunch while raising my legs. I've been avoiding lower ab work because that seems to make it worse, although I agree that core strengthening is usually good. Before I had to stop, I'd say that I was as strong as ever.
I think at this point I need to go see an expert, I'm just not sure I can afford it with my health insurance
.