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Table 1 General information and factors related to hardware failure

From: Risk factors of instrumentation failure after laminectomy and posterior cervical fusions (PCF)

 

Hardware failure

No hardware failure

p-value

No. of patients

14

42

 

No. of screws

98 (30*)

381

 

 PS

37 (17*)

124

 

 LMS

61 (13*)

257

 

Age (years)

57 ± 9.2

55 ± 9.6

0.515

Sex

  

0.086

 Male/Female

10/4

31/11

 

Fixation level

4.6 ± 0.7

4.5 ± 0.7

0.605

 4 levels

7

26

 

 5 levels

5

10

 

 6 levels

2

6

 

Fusion

  

0.987

 With

13

39

 

 Without

1

3

 

Screw density

1.5 ± 0.2

1.7 ± 0.3

0.051

Lower intrumented EV

  

0.019

 C7

12

21

 

 T1

2

21

 

Regional HU

   

 PS

267 ± 45

368 ± 43

0.001

 LMS

308 ± 53

412 ± 41

0.001

Osteoporosis

  

0.001

 With

8

6

 

 Without

6

36

 
  1. *Screws with hardware related problems including screws loosening, breakage, or back out
  2. PS, pedicle screw; LMS, lateral mass screw; EV, end vertebra; Screw density (Number of screws divided by actually fixed levels)
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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