Validation of the Long Sitting Test on Subjects With Iliosacral Dysfunction

This study investigated the use of the long sitting test as an indicator of iliosacral dysfunction. Fifty-one subjects between the ages of 18 and 37 were assigned to either an experimental group or control group through a screening procedure. The 30 subjects in the control group had even posterior superior iliac spine (PSIS) heights and negative standing and sitting flexion tests. The 21 subjects in the experimental group had uneven PSIS heights, positive standing flexion tests, and negative sitting flexion tests. Measurements were taken of the change in the subjects' malleoli as they moved from a supine to a sitting position. Additional supplemental and confirmational tests were then administered. The results of the long sitting test for iliosacral dysfunction were found to be significant at the 0.01 level. Possible influences on this test indicated by the confirmational and supplemental tests were also explored.