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Table 1 Description of the two different types of joint movements

From: In vivo estimation of the shoulder joint center of rotation using magneto-inertial sensors: MRI-based accuracy and repeatability assessment

Motion type Graphical representation Description
Cross With the elbow joint in maximum extension, the hand describes two arcs generated by thoraco-humeral rotations consisting in two successive elevation movements (ROM equals to Ɵ; plane of elevation = 0°: abduction, 90°: forward flexion)
Star With the elbow joint in maximum extension, the hand describes four arcs generated by thoraco-humeral rotations consisting in four successive elevation movements (ROM equals to Ɵ; plane of elevation = 0°: abduction, 30°, 60°, 90°: forward flexion)