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Table 5 Angular displacement (degrees) of the head relative to the sternum and VA length change (%) combining data from all cervical spine levels (C1 to C7), donors and clinicians during CSM thrusts

From: Kinematics of the head and associated vertebral artery length changes during high-velocity, low-amplitude cervical spine manipulation

 

Ipsilateral cervical spine manipulation

Contralateral cervical spine manipulation

Rotation

Lateral flexion

Rotation

Lateral flexion

X

Y

Z

Whole

V3

X

Y

Z

Whole

V3

X

Y

Z

Whole

V3

X

Y

Z

Whole

V3

Mean

1.2

8.8

− 10.2

1.3

2.6

− 3.9

5.3

− 4.4

1.0

2.2

0.0

− 7.9

7.7

1.0

1.4

− 3.3

− 6.1

1.2

1.2

1.4

SD

3.4

3.0

3.5

1.0

3.6

2.9

3.0

5.7

0.9

3.0

2.9

3.3

3.1

0.6

1.7

2.9

3.2

5.0

1.4

2.0

Minimum

− 6.6

2.5

− 16.1

− 0.4

− 0.4

− 13.0

0.4

− 20.0

− 1.1

− 1.1

− 7.7

− 19.3

2.2

− 0.3

− 1.1

− 10.1

− 15.1

− 7.8

− 2.0

− 1.3

Maximum

7.6

14.1

− 3.7

3.3

11.6

0.8

12.6

7.9

3.2

10.4

9.1

− 1.9

14.6

2.3

5.8

1.8

4.4

12.9

4.4

6.0

  1. Ipsilateral manipulations involve contralateral head rotation; positive kinematic values indicate flexion, left lateral flexion and left rotation; positive VA length changes indicate elongation of the vessel
  2. X, coronal axis; Y, sagittal axis; Z, transverse axis; SD, standard deviation; whole, whole VA; V3, V3 segment of VA