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Table 1 Tightness and stripping rates for researchers and surgeons under different testing conditions

From: Screw tightness and stripping rates vary between biomechanical researchers and practicing orthopaedic surgeons

 

Number of insertions attempted

Number of unstripped insertions

Stripping rate (%)

Statistical difference in stripping rate

Unstripped screw tightness (%) (95% CI)

Statistical difference in tightness

All insertions

 All participants

3600

2400

33

 

78 (78–79)

 

 Surgeons

1800

928

48

p < 0.001

82 (81–83)

p < 0.001

 Researchers

1800

1470

18

 

76 (75–76)

 

Plate insertions

 All participants

1800

1204

33

 

76 (75–77)

 

 Surgeons

900

472

48

p < 0.001

82 (80–83)

p < 0.001

 Researchers

900

732

19

 

72 (71–74)

 

Washer insertions

 All participants

1800

1196

34

 

81 (80–81)

 

 Surgeons

900

458

49

p < 0.001

83 (82–84)

p < 0.001

 Researchers

900

738

18

 

79 (78–80)

 

2.7 mm insertions

 All participants

1200

670

44

 

79 (78–80)

 

 Surgeons

600

218

64

p < 0.001

83 (81–85)

p < 0.001

 Researchers

600

452

25

 

77 (76–79)

 

3.5 mm insertions

 All participants

1200

835

30

 

80 (79–81)

 

 Surgeons

600

331

45

p < 0.001

84 (83–85)

p < 0.001

 Researchers

600

504

16

 

77 (76–78)

 

4.5 mm insertions

 All participants

1200

885

26

 

77 (75–78)

 

 Surgeons

600

381

37

p < 0.001

80 (79–82)

p < 0.001

 Researchers

600

504

16

 

74 (72–76)