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Table 2 Allocation of the Specimens to Experimental Groups

From: Pullout strength of pedicle screws with cement augmentation in severe osteoporosis: A comparative study between cannulated screws with cement injection and solid screws with cement pre-filling

Group

Screw Shape

Solid/Cannulated

Augmentation

Full Insertion/Back-Out

Specimen Number

1

Conical

Solid

Retrograde PMMA pre

Full Insertion

6

2

Conical

Solid

Retrograde PMMA pre

Back-Out

6

3

Conical

Solid

None

Full Insertion

6

4

Conical

Cannulated

PMMA injection through perforation

Full Insertion

6

5

Conical

Cannulated

PMMA injection through perforation

Back-Out

6

6

Cylindrical

Solid

Retrograde PMMA pre

Full Insertion

6

7

Cylindrical

Solid

Retrograde PMMA pre

Back-Out

6

8

Cylindrical

Solid

None

Full Insertion

6

9

Cylindrical

Cannulated

PMMA injection through perforation

Full Insertion

6

10

Cylindrical

Cannulated

PMMA injection through perforation

Back-Out

6