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Table 2 Modified Pfirrmann grading in two groups

From: Study of single-level lumbar degenerative diseases treated by unilateral wiltse access with unilateral nail rod fixation assisted by a new automatic retraction device

Item

Ctrl group (n = 24)

Study group (n = 22)

t/χ2

P

Preoperation modified Pfirrmann grading (n)

  

2.105

0.5509

Grade 2

7

6

  

Grade 3

11

11

  

Grade 4

4

5

  

Grade 5

2

0

  

Postoperation Modified Pfirrmann grading (n)

  

6.049

0.1955

Grade 2

7

6

  

Grade 3

11

10

  

Grade 4

2

6

  

Grade 5

3

0

  

Grade 6

1

0

  
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X