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This research described dynamic scapulohumeral rhythm though the measurement of inter relationship between humorous and scapular movement during elevation of the arm in the scapular plane. In the previous studies static plane film X-ray has usually been used, but the limitation of such method was that it did not show the real· movement. In this study, we investigated real movement of humorous and scapular bones by Digital fluoroscopy system. 1. In resting position, humorous was taken to lie at the average 5.97^{circ} in abduction, and scapular at the average 3.66^{circ} in internal rotation. 2. At the maximal abduction, humorous was abducted to the average of 181.25", and scapular was rotated externally to 51.43^{circ}. 3. This research has shown that there is a variety of scapulohumeral rhythm from resting position to 60^{circ} abduction in elevation of humorous. This case study demonstrated that the ratio n of scapulohumeral rhythm is 3.46 to 1, but there was individual difference.
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