Table 3 Pullout and rotational strengths by inserting a conventional- or helical blade-type hip screw into a polyurethane bone model, with the leading (original) screw

Average (min–max) (N)

Average (min–max) (N)

5

253.36 (225.9–280.1)

146.15 (114.9–162.7)

< 0.001

10

575.76 (504.7–669.1)

322.81 (257.0–374.2)

< 0.001

15

1261.33 (1078.0–1497.5)

870.87 (784.1–957.7)

0.031

Average (min–max) (N)

Average (min–max) (N)

5

41.39 (35.5–46.1)

99.73 (91.9–110.0)

< 0.001

10

98.47 (82.8–116.6)

154.02 (132.2–174.3)

< 0.001

15

167.93 (143.4–188.8)

244.74 (197.7–300.4)

< 0.001

Average (min–max) (N)

Average (min–max) (N)

5

17.68 (16.2–19.3)

85.42 (75.1–95.4)

< 0.001

10

57.68 (38.9–72.1)

147.6 (123.0–163.2)

< 0.001

15

111.27 (82.1–157.5)

211.49 (118.2–272.7)

< 0.001