As far as I know, Sjogren's is pretty much limited to the moist areas of the body, including connective tissue that holds our organs together. Maybe other have more ideas about this.
I have had a similar stabbing pain in my groin area for several weeks - after checking w/rheumy, chiropractor, and PCP, I was sent to physical therapy and working with them have regained a lot of lost strength in the hip & knee, but still sometimes have that stabbing pain. No one really has a cause for mine yet...not really characteristic of lupus or fibro.
I would try eliminating things on my own to see if I could find any pattern with it, such as stairs, shoes, standing, getting up - when is it most likely to occur, etc. The more info you can give the rheumy (or any other drs you run into) the better they are able to help figure it out.
Hope you feel better soon,
Lynnwood, Lupus & Sjogren's Moderator
Life is far too important to be taken seriously. - Oscar Wilde, 1882