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PURPOSE: Essential to the successful management of patients with sacroiliac joint pain (SIJP) is understanding how these joints move. The innominates tilt together in the same direction with symmetrical activities (i.e. forward-bending) but move opposite of one another when performing asymmetrical activities (i.e. walking). How they move in patients with SIJP is unknown. The purpose of this study was to examine inter-innominate movement (tilt) when assuming three different stance positions to describe how the innominate bones move in those with and without SIJP. STUDY TYPE: Observational Cohort Study METHODS: Twenty-eight participants were classified into two groups; SIJP with low back pain (LBP), and no SIJP or LBP. SIJP participants were further classified into groups with left or right pelvic tilt. Pelvic tilt was measured during neutral standing and in both left-sided and right-sided reciprocal stance, with a full-stride (one hip fully flexed the other fully extended) and in a half-stride position, which mimic the double-stance phase of gait. A repeated measure ANOVA assessed for differences between Groups (Level, Left or Right Pelvic Tilt), stance side position (left/right), and stride length (full/half). RESULTS: The was a significant Group main effect (F [2, 25] = 130.2, p 0.05), but each was different from the mean for the left pelvic tilt group (p