Fig. 3.

Lumbar lordosis (αL) was defined as the angle between the line from C2 to S and line from L1 to S. Thoracic kyphosis (αT) was defined as the angle between the line from C2 to S and line from L1 to T6. Cervical lordosis (αC) was defined as the angle between the line from C2 to S and line from C7 to C4. Occipital angle (αO) was defined as the angle between the line from C2 to S and line from C2 to EOP (a). Skin marker on 3-dimensional model from motion analysis system also showed at b