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Table 1 Parameters selection and levels definition

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

Design factor

Level 1

Level 2

Screw shape

Conical

Cylindrical

Cement augmentation technique

PMMA pre-filling (Solid screw)

PMMA injection (Cannulated screw)

Screw insertion type

Full insertion

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