Re: RA with Sharp, stabbing pain that comes and goes (intermittent)
Klippel-Feil is a congenital malformation so even if that had to be surgically fixed, doesn't mean he doesn't have more problems further down.
But RA can also do some nasty stuff and if he hasn't talked to his rheumatologist, he should. Vasculitis needs to be ruled out for sure. The inflammation of Ra can inflame the interior of vessels anywhere in the body and cause major pain. Have they checked his ESR, CRP and WBC and other signs of inflammation?
They call lupus the great pretender as it can mimic just about any disease but RA is a close second. My rheumatologist oversees my neck problems too so I just have 1 doc overseeing the skeleton as I have found that spine docs and even physiatrists(rehab docs) don't get what RA can do. I went from an ophthalmologist to a neuro-ophthalmologist and 3 years of testing for strange visual problems until my rheumy put me on a biologic and my eye problems magically went away. Had none of the symptoms of RA uveitis but that is what it was. RA had inflamed the blood vessels in my optic nerves and eyeballs. RA is a very strange disease.
So if it were me, I'd check the neck and other areas of the spine(they now know RA can hit anywhere in the spine, not just in the neck)and I'd check all his blood tests for any indication that the disease is inflaming the blood vessels of his muscles. The pain and areas you describe sound very close to what I've read on vasculitis when it affects the peripheral vessels...causes symptoms similar to peripheral neuropathy in multiple areas, or polyneuropathy. RA can casue both the spine problems and the vessel problems.
I hope he finds an answer.