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Chiropractic Journal of Australia : CJA March 2012
3 Chiropractic Journal of Australia Volume 42 Number 1 March 2012 of the sacroiliac joint when weight is transferred from two feet to one foot. Measurement relies on observation of a thumb placed on the PSIS of the weight bearing side and its movement relative to a thumb place on S2. If the test is taken on the left leg, the tester places the thumb of the left hand on the left PSIS and the rest of the hand on the left innominate. The right thumb is placed on S2. (Figure 1) The subject is instructed to lift the right leg. It is a negative result if the PSIS, as indicated by the thumb location, does not move or moves caudally. It is a positive result if it moves cephalad. If the test is taken with the right leg weight bearing, the tester places the thumb of the right hand on the right PSIS and the thumb of the left hand on S2 and the subject lifts the left leg. 1. Stork test outcome using OMI is independent of starting stance 2. Stork test outcome using OM2 is independent of starting stance 3. Stork test outcome is independent of observation method used for Stance t 4. Stork test outcome is independent of observation method used for Stance o METHODS The study used a within subjects experimental design with the independent variables being the two different stances OBSERVATION METHODS STORK TEST CURNOW • COBBIN • WYNDHAM Manual and exercise therapists commonly use the test pre and post treatment to assess whether the combined action of muscle fbres that provide compressive forces to the sacroiliac joint (SIJ), such as transversus abdominis7 and gluteus maximus,2 produce the ‘self-bracing’/locking position on the weight bearing side of the leg lift. If the test shows counternutation, muscle training along with manual therapy may be used to improve the muscle recruitment pattern. However, it is important to use the same starting stance, as it has been established previously that results may vary with the distance between the feet for the commencement of the test.3 Traditionally, the test has focused on the movement of the thumb placed on PSIS and Hungerford and Gilleard4 noted there is minimal rotation in the weight bearing side of the SIJ after the initial ‘toe off’. The present study examines movement of the PSIS and S2, as indicated by thumb locations, across two stances. The aims of the present study were to: 1. Observation Method 1 (OM1) was to compare movement of the innominate, as observed by the location of a thumb placed on PSIS, across two stances 2. Observation Method 2 (OM2) was to compare the spatial relationship between PSIS and S2, as observed by the location of thumbs placed on PSIS and S2, across two stances The null hypotheses: Figure 1. To clearly distinguish the thumb position for reviewing on the screen, both thumbs had strips of black tape placed along the dorsal side from the tips of the nails to the carpometacarpal joints. Figure 2. Stance t: the body weight evenly distributed over both feet. Each stance for each subject was identified by a number (1 through to 148), which was written onto a label and placed on the subject's bottom or back prior to the test. Figure 3. Stance o: most of the body weight on one foot and the ball of the other foot resting on the ground.
CJA June 2012