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Table 3 Comparison of the SAD between the two groups

From: The small screw-apex distance is potentially associated with femoral head osteonecrosis in adults with femoral neck fractures treated by closed reduction and percutaneous 3 parallel cannulated screws

 

AP view

 

Lateral view

 

SAD

 

Items

ONFH group

(n = 13)

Normal group

(n = 87)

P value

ONFH group

(n = 13)

Normal group

(n = 87)

P value

ONFH group

(n = 13)

Normal group

(n = 87)

P value

1st screw(mm)

13.48 ± 6.73

(4.54–31.77)

18.47 ± 6.49

(3.12–36.63)

0.01

13.13 ± 5.80

(6.60-21.79)

14.90 ± 4.73

(1.88–28.16)

0.22

26.61 ± 10.32

(11.73–53.56)

33.37 ± 9.33

(12.13–60.70)

0.02

1st + 2nd screw(mm)

34.95 ± 13.52

(13.78–70.49)

44.80 ± 12.44

(17.10-77.86)

0.01

31.06 ± 11.05

(19.40-54.54)

34.17 ± 9.18

(3.96–61.51)

0.27

66.01 ± 21.86

(34.79-125.02)

78.97 ± 17.68

(43.96-130.26)

0.02

1st + 2nd + 3rd screw(mm)

67.38 ± 18.80

(40.10-113.63)

81.54 ± 17.66

(40.81-128.83)

0.01

52.84 ± 16.76

(34.63–89.35)

58.36 ± 14.19

(6.37–96.91)

0.20

120.20 ± 30.03

(77.60-202.98)

139.90 ± 25.87

(87.73-217.02)

0.01

  1. ONFH, osteonecrosis of the femoral head; SAD, screw-apex distance; AP, anteroposterior
  2. Data are presented as the mean ± standard deviation(range) or number of patients. Differences are considered significant at p < 0.05
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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