I'm with "jesspt" on this one. The majority of our tests are done in a stationary position therefore even without positive testing, arguably there could be some "SIJ dysfunction" with functional movements (i.e. during the gait cycle).
However, without positive signs and symptoms at the SIJ, I would not likely specifically treat the SIJ (i.e. if we are talking specific manual therapy techniques) believing the true issue is elsewhere. I would treat other areas (where ever positive findings are found) that could of course affect SIJ function via direct mechanical attachments (lower Lsp) or direct / indirect myofascial connections (basically any musculature (tightness, weakness, imbalance....whatever) throughout the Tsp, Lsp, pelvic girdle, L/E etc....
Rereading this, it sounds like I've flip-flopped a little BUT .... based on what I have seen, I don't always think that what appears as SIJ dysfunction with kinetic testing can actually be treated effectively by just addressing the SIJ. All the other "stuff" around the joint seems to be the real issue. (I guess that is what I was getting at with my question on 02-07-2008).