Skip to main content

Table 1 Comparison of characteristics between levels with and without posterior heterotopic ossification

From: Effects of endplate coverage and intervertebral height change on heterotopic ossification following cervical disc replacement

 

non-PHO (n = 101)

PHO (n = 73)

P value

No. of patients, n

74

64

–

No. of surgical levels, n

   

 Single-level

59

43

0.949

Level distribution

  

0.516

 C3/4

7

3

 

 C4/5

17

18

 

 C5/6

62

44

 

 C6/7

15

8

 

Age, years

43.10 ± 7.94

45.23 ± 8.41

0.110

Sex (M/F)

47/54

38/35

0.472

BMI

23.43 ± 2.87

23.36 ± 2.39

0.884

Blood loss, ml

53.81 ± 28.05

53.84 ± 34.27

0.647

Follow-up, months

48.43 ± 20.62

55.97 ± 28.23

0.276

Milling angle

0.89 ± 3.52

0.83 ± 4.12

0.590

Mean depth of prosthesis, mm

15.31

15.42

0.686

Mean height of prosthesis, mm

5.61

5.63

0.980

Prosthesis-endplate depth ratio, %

94.92 ± 3.26

92.13 ± 3.75

 < 0.001*

Post-operative disc height change, mm

1.76 ± 0.99

2.56 ± 1.04

 < 0.001*

Anterior bone loss

62

45

0.973

  1. PHO, posterior heterotopic ossification
  2. *Significant difference between two groups