Pretic-I was a safe and effective artificial cervical disc prosthesis--a retrospective and comparative study with 5-year follow-up

Table 6 Follow-up results of clinical parameters

Items	Groups	Pre-operative		3 Months		12 Months		Final Follow-up
VAS-neck	Discover (n = 32)	3.91 ± 1.94	p = 0.9483	0.75 ± 0.66	p = 0.7325	0.38 ± 0.54	p = 0.6477	0.22 ± 0.41	p = 0.7606
VAS-neck	Pretic-I (n = 32)	3.88 ± 1.83	p = 0.9483	0.69 ± 0.77	p = 0.7325	0.31 ± 0.53	p = 0.6477	0.19 ± 0.39	p = 0.7606
VAS-arm	Discover (n = 32)	5.78 ± 1.83	p = 0.7211	0.72 ± 0.76	p = 0.7565	0.66 ± 0.73	p = 0.7402	0.41 ± 0.55	p = 0.8133
VAS-arm	Pretic-I (n = 32)	5.59 ± 2.26	p = 0.7211	0.78 ± 0.82	p = 0.7565	0.59 ± 0.74	p = 0.7402	0.38 ± 0.48	p = 0.8133
NDI	Discover (n = 32)	24.56 ± 9.53	p = 0.5516	11.09 ± 5.44	p = 0.7609	8.06 ± 3.58	p = 0.3127	5.63 ± 2.46	p = 0.6857
NDI	Pretic-I (n = 32)	23.16 ± 8.96	p = 0.5516	10.72 ± 4.13	p = 0.7609	7.13 ± 3.67	p = 0.3127	5.38 ± 2.38	p = 0.6857
JOA	Discover (n = 21)	8.14 ± 1.61	p = 0.3903	13.90 ± 1.11	p = 0.0327* SP = 54.73%	15.14 ± 0.71	p = 0.8445	16.29 ± 0.76	p = 0.3015
JOA	Pretic-I (n = 26)	8.58 ± 1.71	p = 0.3903	13.04 ± 1.45	p = 0.0327* SP = 54.73%	15.08 ± 1.36	p = 0.8445	16.04 ± 0.81	p = 0.3015

VAS Visual analog score, NDI Neck disability index, JOA Japanese Orthopaedic Association score, SP Statistical power
* indicates that the data has a P value less than 0.05

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