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Table 12 Incidence of complications

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

Items

Groups

Pre-operative

1 Week

3 Months

12 Months

Final Follow-up

HO

 Grade I

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

9.38%(3/32)

p = 0.6414

15.63%(5/32)

p = 1.0000

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

6.25%(2/32)

15.63%(5/32)

 Grade II

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

6.25%(2/32)

p = 1.0000

15.63%(5/32)

p = 0.7404

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

6.25%(2/32)

18.75%(6/32)

 Grade III

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

18.75%(6/32)

p = 0.2807

21.88%(7/32)

p = 0.0722

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

9.38%(3/32)

6.25%(2/32)

 Grade IV

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

12.50%(4/32)

p = 0.3911

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

6.25%(2/32)

 Grade III + IV

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

18.75%(6/32)

p = 0.2807

34.38%(11/32)

p = 0.0389*

SP = 95.36%

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

9.38%(3/32)

12.50%(4/32)

 Total

Discover (n = 32)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

34.38%(11/32)

p = 0.2661

65.63%(21/32)

p = 0.1306

Pretic-I (n = 32)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

21.88%(7/32)

46.88%(15/32)

Subsidence

Discover (n = 32)

(−)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

9.38%(3/32)

p = 0.3107

12.50%(4/32)

p = 0.1623

Pretic-I (n = 32)

(−)

0.00%(0/32)

0.00%(0/32)

3.13%(1/32)

3.13%(1/32)

Displacement

Discover (n = 32)

(−)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

0.00%(0/32)

(−)

6.25%(2/32)

p = 0.5543

Pretic-I (n = 32)

(−)

0.00%(0/32)

0.00%(0/32)

0.00%(0/32)

3.13%(1/32)

Dysphagia

Discover (n = 32)

0.00%(0/32)

(−)

12.50%(4/32)

p = 0.6888

3.13%(1/32)

p = 1.0000

0.00%(0/32)

(−)

0.00%(0/32)

(−)

Pretic-I (n = 32)

0.00%(0/32)

9.38%(3/32)

3.13%(1/32)

0.00%(0/32)

0.00%(0/32)

  1. HO Heterotopic ossification, (−) Without valid data
  2. * indicates that the data has a P value less than 0.05