Biomechanical comparison of noncontiguous cervical disc arthroplasty and noncontiguous cervical discectomy and fusion in the treatment of noncontinuous cervical degenerative disc disease: a finite element analysis

Table 3 Comparison of average pressures in intervertebral discs at different intervertebral levels

Pressure (MPa)	Segments	Models			P values
Pressure (MPa)	Segments	Intact	Arthroplasty	Fusion	Intact vs arthroplasty	Intact vs fusion	Arthroplasty vs fusion
Flexion
	C2/3	0.21 ± 0.05	0.23 ± 0.03	0.34 ± 0.06	0.440	< 0.001	< 0.001
	C4/5	0.26 ± 0.05	0.27 ± 0.04	0.41 ± 0.06	0.704	< 0.001	< 0.001
	C6/7	0.24 ± 0.04	0.27 ± 0.04	0.43 ± 0.05	0.138	< 0.001	< 0.001
Extension
	C2/3	0.25 ± 0.05	0.24 ± 0.03	0.35 ± 0.06	0.690	0.005	0.001
	C4/5	0.26 ± 0.045	0.27 ± 0.04	0.42 ± 0.05	0.815	< 0.001	< 0.001
	C6/7	0.24 ± 0.04	0.28 ± 0.04	0.45 ± 0.04	0.151	< 0.001	< 0.001
Lateral bending
	C2/3	0.36 ± 0.05	0.35 ± 0.03	0.55 ± 0.07	0.701	< 0.001	< 0.001
	C4/5	0.39 ± 0.06	0.41 ± 0.04	0.63 ± 0.08	0.350	< 0.001	< 0.001
	C6/7	0.38 ± 0.05	0.41 ± 0.04	0.66 ± 0.06	0.176	< 0.001	< 0.001
Axial rotation
	C2/3	0.39 ± 0.06	0.39 ± 0.03	0.61 ± 0.06	0.896	< 0.001	< 0.001
	C4/5	0.42 ± 0.05	0.44 ± 0.05	0.69 ± 0.08	0.518	< 0.001	< 0.001
	C6/7	0.40 ± 0.06	0.44 ± 0.05	0.69 ± 0.06	0.123	< 0.001	< 0.001

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