Indeed poor kitties...
I also brought up a weird thing on Pippin I want looked at. I don't think we got around to talking about it when you were here... He has a bony protrusion right at the end of his ribcage that moves around, sometimes flips so it's pointing straight out, sometimes back inside and you can't feel it. It doesn't seem to bother him when it moves around but it's really weird.
I know exactly what you're talking about.
One of my Pekes (Dino) had the same thing. It never bothered him but whenever I lifted him up by the chest, I could sometimes feel it sticking into my hand.
I think it's a weird genetic thing that some critters get. Not harmful that I know of.
Unless it's a hernia, but that wouldn't feel sharp and bony, I wouldn't think.