[Purpose] Physical therapists, osteopathic practitioners, and chiropractors often perform
manual tests to evaluate sacroiliac joint (SIJ) mobility. However, the available evidence
demonstrates an absence of reliability in these tests and in investigations with kinematic
analysis. The aim of this study was to verify the three-dimensional kinematic reliability
in SIJ movement measurements. [Subjects] This cross-sectional study analyzed 24 healthy
males, aged between 18 and 35 years. [Methods] Three-dimensional kinematic analysis was
performed for measurements of posterior superior iliac displacement and greater trochanter
(femur) displacement during hip flexion movement in an orthostatic position. The distance
variations were measured from a reference point in 3 blocks. The intra-observer
reliability was compared with the mean of three 3 blocks using the interclass correlation
coefficient (ICC) and a 99% significance level. [Results] The measurements indicated a
strong correlation among blocks: ICC = 0.94 for right side SIJ and ICC = 0.91 for left
side SIJ. The mean displacement between the reference points was 7.7 mm on the right side
and 8.5 mm on the left side. [Conclusion] Our results indicate that three-dimensional
kinematic analysis can be used for SIJ mobility analyses. New studies should be performed
for subjects with SIJ dysfunction to verify the effectiveness of this method.
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