Table 2 Gertzbein-Robbins Scale, Neo, and Heary classifications for cervical and thoracic pedicle screw placement.

From: Feasibility and safety report on robotic assistance for cervical pedicle screw fixation: a cadaveric study

Gertzbein-Robbins Scale

Neo classification

Heary classification

 

Number of screws

Grade A

Grade B

Grade C

Grade D

 

Grade 0

Grade 1

Grade 2

Grade 3

 

Grade 1

Grade 2

Grade 3

Grade 4

C2

2

2

   

C2

2

   

C2

2

   

C3

2

2

   

C3

2

   

C3

2

   

C4

4

4

   

C4

4

   

C4

4

   

C5

6

4

1

1

 

C5

4

1

1

 

C5

4

1

 

1

C6

6

4

2

  

C6

4

2

  

C6

4

2

  

C7

6

4

2

  

C7

4

2

  

C7

4

2

  

T1

6

5

1

  

T1

5

1

  

T1

5

1

  

T2

4

2

2

  

T2

2

2

  

T2

2

2

  

T3

4

3

1

  

T3

3

1

  

T3

3

1

  

Total

40

30

9

1

0

Total

30

9

1

0

Total

30

9

 

1

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