slogo,
I have a spot in the same area that is tender, hurt...
I have L/4 and L/5 bulges, and some sacro-illiac problems. As the degernative problems increase that groin spot is more noticable. It seems to be the l4, the L5 is more the outside of my thigh, and down back of my leg, the frojnt groin is more my L4....

Somewhere on the old site I had links to nerve Demographs........Think that is what they are called. I will do a serarch for one unless somebody has a saved link.

One more thought, maybe not your problems or maybe not even mine, but I had a bone scan for density and the results noted Flybolites? I think that was what it was called. I wonder about the front of the hip, and groin being something like that.
Di