Table 1 Nomenclature

V_2a

V_2a,: model volume at maximum extension position (Group A);

V_1b

V_1b,: model volume at supine position (Group B);

V_2b

V_2b, _y: model volume at maximum extension position (Group B);

L_SLH/L_ELH

The longitudinal radial length of the model on the horizontal projection plane at the supine position/at the maximum extension position

L_SLS/L_ELS

The longitudinal radial length of the model on the sagittal projection plane at the supine position / at the maximum extension position

L_SLC/L_ELC

The longitudinal radial length of the model on the Coronal projection plane at the supine position/ at the maximum extension position

L_STH/L_ETH

The transverse radial length of the model on the horizontal projection plane at the supine position/ at the maximum extension position

L_STS/L_ETS

The transverse radial length of the model on the sagittal projection plane at the supine position/ at the maximum extension position

L_STC/L_ETC

The transverse radial length of the model on the coronal projection plane at the supine position/ at the maximum extension position

S_SH/ S_EH

The area of the model on the horizontal plane at the supine position/ at the maximum extension position

S_SS/ S_ES

The area of the model on the Sagittal plane at the supine position/ at the maximum extension position

S_SC/ S_EC

The area on the coronal plane of the model at the supine position/ at the maximum extension position

α _SIH/ α _EIH

The lower corner angle of the quadrilateral of the model on the horizontal projection plane at the supine position/ at the maximum extension position

α _SIS/ α _EIS

The lower corner angle of the quadrilateral of the model on the sagittal projection plane at the supine position/ at the maximum extension position

α _SIC/ α _EIC

The lower corner angle of the quadrilateral of the model on the coronal projection plane at the supine position/ at the maximum extension position

α _SLH/ α _ELH

The left corner angle of the quadrilateral of the model on the horizontal projection plane at the supine position/ at the maximum extension position

α _SLS/ α _ELS

The left corner angle of the quadrilateral of the model on the Sagittal projection plane at the supine position/ at the maximum extension position

α _SLC/ α _ELC

The left corner angle of the quadrilateral of the model on the ccoronal projection plane at the supine position/ at the maximum extension position