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Excerpt
The purpose of this project was to determine the validity of external measurements of scapular positioning to measurements from X-rays. Five normal subjects were measured for scapular positioning in three anatomical positions: 1- arms at side, 2- hands on hips, 3- arms abducted with forearms maximally internally rotated. The distance from the distal portion of the inferior boarder of the scapula to the thoracic spine was measured in cm's. Each subject was measured on the dominant and nondominant sides. The measurements were duplicated from chest X-rays in each of the three arm positions. A cm ruler positioned in the field of view of the X-ray was used to make the X-ray measurements to account for distortion. Correlation coefficients were determined for each test at each position. Five of the 6 correlation's were statistically significant. The mean correlation coefficient for the 6 measurements was 0.91. Mean(SD) Mean(SD) r X-ray, DOM Pos 1 12.3(2.8) External, DOM Pos 1 11.3(2.4) 0.90* X-ray, DOM Pos 2 12.2(0.9) External, DOM Pos 2 10.6(0.6) 0.75 X-ray, DOM Pos 3 12.9(0.9) External, DOM Pos 3 11.2(0.9) 0.94* X-ray, NDOM Pos 1 12.4(2.0) External, NDOM Pos 1 10.7(2.0) 0.96* X-ray, NDOM Pos 2 12.2(1.8) External, NDOM Pos 2 10.5(1.5) 0.96* X-ray, NDOM Pos 3 12.5(2.4) External, NDOM Pos 3 10.4(1.3) 0.95* Considering the high correlation's between the external measurements of scapular positioning and the measurements obtained using X-rays, the external method is a valid method of determining scapular positioning.
