Design: A within subjects experimental design. Independent variable – three different stances for the commencement of the test. Dependent variable – stork test outcome. All 222 tests were videoed and reviewed on a computer screen using horizontal lines to identify the vertical direction and relative distance of thumb movement.
Setting: Videoing was carried out in an appropriately equipped studio in southern NSW.
Participants: Seventy-four adult volunteers. Inclusion criteria – able to flex the hip to 90º. Exclusion criteria – stroke, spinal fusion, a scoliosis noted on x-ray or obvious to the eye, antalgic gait, hip or knee replacement, a leg length difference noted by a therapist.
Outcome Measure: Change in distance between thumb locations on the posterior superior iliac spine of the side of the weight bearing leg and second sacral spinous process on the side of the lifting leg. Negative result – no change or decrease in distance between the thumbs. Positive result – increase in distance between the thumbs.
Results: Stork test outcome was influenced by starting stance, with over 70% of subjects having inconsistent results across stances. Kappa values were poor to fair and ranged from 0.14 to 0.26 between stance pairs.
Conclusion: When stork tests are used to assess the ‘self bracing’ mechanism of the SIJ pre, during and post treatment, the same starting stance should be used.
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