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Table 3 Definitions of angles used to describe the sitting and standing posture

From: Physical risk factors for adolescent neck and mid back pain: a systematic review

Angle Lines forming the angle
Sitting posture [27, 28]
 Cervicothoracic angle Line 1:SP T12 – SP C7
Line 2:SP C7 – Tragus (ear)
 Craniocervical angle Line 1:SP C7 – Tragus (ear)
Line 2:Tragus (ear) – Canthus (eye)
 Head flexion Line 1:Canthus (eye) - Tragus (ear)
Line 2:Vertical line through Tragus (ear)
 Lumbar angle Line 1:Greater trochanter – ASIS
Line 2:ASIS – SP T12
 Neck flexion Line 1:Tragus (ear) – SP C7
Line 2:Vertical line through SP C7
 Pelvic tilt Line 1:Greater trochanter – ASIS
Line 2:Vertical line through Greater trochanter
 Trunk angle Line 1:Greater trochanter – SP T12
Line 2:SP T12 – SP C7
Standing posture [23,24,25]
 Body lean angle Line 1:Lateral malleolus – SP C7
Line 2:Vertical line through SP C7
 Craniovertebral angle Line 1:Tragus (ear) – SP C7
Line 2:Horizontal line through SP C7
 Pelvic displacement angle Line 1:Lateral malleolus – Greater trochanter
Line 2:Vertical line through Greater trochanter
 Trunk lean angle Line 1:Greater trochanter – SP C7
Line 2:Vertical line through SP C7
  1. ASIS anterior superior iliac spine, SP Spinous process