Fig. 2
Assessment of range of motion (ROM) with the localized coordinate system of the scapula—position of the scapula in internal and exterior orientations. The distance from C7 to the scapular centre of rotation was quantified—the position of the scapula, both superior and inferior. Determine the vertical distance from C7 to the scapular centre of the moment. C The angle of superior rotation of the scapula. The ST is the angle formed between the spine and the medial edge of the scapula, as projected in the coronal plane—the angle of scapular internal rotation. The angle formed between the line connecting the base of the scapular gonad and the posterior angle of the acromion (the projection point in the transverse plane) and the coronal plane is measured. E The angle of posterior tilt of the scapula is determined by the line connecting C7 and T7 and the angle formed by the line extending through the inferior angle of the scapula and the root of the scapular gonad (projected in the sagittal plane). AC: most dorsal point on the acromioclavicular joint. ZS: the line connecting trigonum spinae scapula and angulus acromialis. XS: the line perpendicular to the plane formed by AI, angulus acromialis angulus inferior, and trigonum spinae scapulae. Ys: the common line perpendicular to the Xs-and Zs-axis. Yc: local axis for the clavicle coordinate system