Table 1 Bony landmarks used on the definition of the local coordinate system of the thorax, scapula and humerus. Segment Bony Landmark Abbrev Thorax T8 spinous process T8 Xiphoid process of the sternum PX C7 Spinous process C7 Incisura Jugularis of the sternum IJ Scapula Angulus acromialis AA Trigonum Spinae Scapulae TS Angulus Inferior Scapulae AI Humerus Epicondylus medialis EM Epicondylus lateralis EL Glenohumeral rotation centre * GH Abbrev: Abbreviations. * Estimated by motion recordings, calculating the pivot point of instantaneous helical axes of GH motion (Veeger, 2000, Stokdijk et al., 2000)