Table 1 Definitions of the nine postural angles
From: Development of a cost effective three-dimensional posture analysis tool: validity and reliability
Angle | Definition |
|---|---|
Head flexion (HF) | The angle between a line drawn from the Cyclops* to the OCI** and the vertical axis. |
Neck flexion (NF) | The angle between a line drawn from the OCI to the C7 SP and the vertical axis. |
Cranio-cervical angle (CC) | The angle between a line drawn from the Cyclops to the OCI to the C7 SP. |
Cervico-thoracic angle (CT) | The angle between a line drawn from the OCI to the C7 SP to the T5 SP. |
Trunk flexion (TF) | The angle between a line drawn from the C7 SP to the mid-point of the greater trochanters and the vertical axis. |
Head lateral bending (HLB) | The lateral angle between a line drawn from the OCI to the tragus, with the vertical line going through the OCI (negative to the left). |
Neck lateral bending (NLB) | The angle between a line drawn from the OCI to the C7 SP, with the vertical axis going through C7 in the frontal plane. |
Head rotation (HR) | The angle between a line drawn from the OCI to the Cyclops, with the anterior axis in the transverse plane (negative to the left). |
Thoracic trunk rotation (TTR) | The angle between a line drawn from the sternum to the T5 SP, with the anterior axis in the transverse plane (negative to the left). |