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Table 1 Means of insertion time and pull-out strength

From: Comparison of insertion time, pull-out strength, and screw-media interface area of customized pedicle screw with different core and thread design against commercial pedicle screw: a pilot study on Indonesian Population

Descriptive result

 

N

Minimum

Maximum

Mean ± SD

Insertion time (s)

 V cylinder (A)

5

19.97

28.85

22.94 ± 1.54

 Square conical (B)

5

15.79

18.88

17.04 ± 0.64

 Square cylinder (C)

5

10.85

19.27

15.57 ± 1.56

 Commercial (D)

5

9.19

22.72

15.86 ± 2.44

 Total

20

9.19

28.85

17.85 ± 1.02

Pullout strength (N)

 V cylinder (A)

5

476

1043

746.60 ± 97.89

 Square conical (B)

5

618

1143

836.60 ± 95.05

 Square cylinder (C)

5

579

860

692.40 ± 48.54

 Commercial (D)

5

314

541

408.60 ± 43.23

 Total

20

314

1143

671.05 ± 50.50