Objectives: The stork test is a palpation test to detect movement in the sacroiliac joint (SIJ). It is used to assess the self-bracing mechanism of the SIJ when weight is transferred from two feet to one foot, as in gait. Nutation (anterior rotation of the sacral base) together with posterior rotation of the innominate (os coxa or pelvic bone) places the joint in a locked or ‘self braced’ position, which is better able to withstand the shear forces of vertical loading. In the stork test, thumbs are placed on the posterior superior iliac spine (PSIS) on the side of the weight bearing leg and the second sacral spinal process (S2) on the side of the lifting leg.
The aims of the present study were to:
1. examine movement of the innominate, by observing movement of the PSIS thumb across two stances, as in the stork test and
2. to examine the spatial relationship between the innominate and sacrum, by observing the change in distance between the PSIS thumb and S2 thumb across two stances, as in the stork test.