Fig. 3

a Standing CAA. The definition of CAA is the angle between two lines with Tragus of Ear and Spinous process of C7 and Spinous process of C7 and greater tuberosity of humerus. b Raising CAA. The definition of raising CAA is the same as the standing CAA. c PFIA. Definition of PFIA is the ASIS-PSIS-horizontal plane. d Sitting CAA. Definition of Sitting CAA is the angle between lower endplates of C1 and that of C7. e TKA. Definition of TKA is the angle between T4 superior endplates and T12 lower endplates. f LLA. Definition of LLA is the angle between superior endplates of L1 and that of S1