Fig. (2) Method for measuring the movement of the ribs As an example, the measurement method of the left fifth rib is shown. A: the center between the seventh cervical vertebra and the first thoracic vertebrae; B: the center between the twelfth thoracic vertebra and the first lumbar vertebra; C: the proximal end on the caudal side of each rib; D: distal end on the cranial side of each rib; C’ and D’: perpendicular lines are drawn from point C and point D to the straight line AB, and the intersections thereof are taken as points C 'and points D’; Moving distance of the rib: based on the distance between C'D 'at the position with the upper limbs hanging downwards, the change in the distance between C'D' at the position with the upper limbs elevated up to 160°.