Intradiscal Pressure Changes during Manual Cervical Distraction: A Cadaveric Study

Table 3

Summary of forces (𝑁) for all DCs.

Contact location	DC1, 𝑁=8		DC2, 𝑁=4		DC3, 𝑁=3		DC4, 𝑁=4
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Neutral traction
C5
Traction force	88.6	9.3	73.3	14.2	56.2	19.9	101.8	8.2
Lateral force	−11.3	4.5	−5.3	1.3	−0.5	1.5	−12.9	4.6
PA force	30.2	9.2	11.8	3.6	20.2	14.5	39.4	3.1
C6
Traction force	72.6	17.0	78.0	14.7	52.1	29.9	94.6	23.3
Lateral force	−9.4	2.1	−3.3	4.3	−4.1	2.2	−8.9	13.1
PA force	34.0	10.2	16.7	8.0	24.6	14.4	56.4	9.2
Fixed flexion and traction
C5
Traction force	87.4	12.6	83.5	21.1	56.7	35.1	109.6	19.1
Lateral force	−12.4	4.6	−4.3	6.5	−4.6	2.6	−17.8	7.5
PA force	42.1	9.8	15.1	3.9	30.3	22.2	60.4	9.4
C6
Traction force	72.5	16.6	77.2	21.1	54.2	27.3	99.1	22.9
Lateral force	−9.6	3.4	−3.6	4.5	−3.8	2.8	−14.3	8.1
PA force	45.9	8.6	27.5	9.8	28.1	14.4	61.6	5.1
Moving flexion and traction
C5
Traction force	101.7	16.1	127.6	38.3	84.8	38.7	107.1	9.0
Lateral force	−9.6	3.5	−11.8	5.6	−2.2	2.2	−13.9	7.5
PA force	53.1	16.0	34.6	9.2	21.2	12.9	63.6	9.9
C6
Traction force	90.2	24.8	119.2	37.3	79.9	37.4	91.4	12.4
Lateral force	−3.5	9.7	−10.4	12.2	−2.8	4.8	−8.4	7.9
PA force	56.1	12.1	55.0	18.5	62.4	45.5	82.6	10.2