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Table 2 Continuous variables included in the study

From: Male gender, Charnley class C, and severity of bone defects predict the risk for aseptic loosening in the cup of ABG I hip arthroplasty

Variable

Stable implant (N = 121)

Unstable cup (N = 32)

P

Age at surgery (yrs.)

45.6 ± 7.1

47.8 ± 5.8

0.102a

 

45.4 (25.1-64.5)

48.3 (37.6-56.7)

 

Height (cm)

165.7 ± 8.7

165.4 ± 9.5

0.864a

 

165 (150-195)

165 (149-187)

 

Weight (kg)

75.1 ± 14.3

75.2 ± 14.8

0.918b

 

73 (42-114)

73 (50-105)

 

Cup size (mm)

50.2 ± 3.7

50.5 ± 4.1

0.830b

 

50 (46-60)

49 (46-60)

 

PE liner thickness (mm)

7.0 ± 1.9

7.2 ± 2.0

0.805b

 

6.9 (2.8-11.9)

6.4 (4.9-11.9)

 

Abduction angle of the cup (°)

46.0 ± 8.2

43.0 ± 6.3

0.073b

 

46 (28-72)

43 (28-54)

 

Time to revision surgery (yrs.)

5.7 ± 1.8

6.9 ± 1.8

0.002 a

 

5.7 (2.0-10.4)

6.9 (3.7-10.5)

 

Linear wear rate (mm/yrs.)

0.42 ± 0.38

0.39 ± 0.32

0.764b

 

0.35 (0.0-2.28)

0.31 (0.0-1.32)

 

Volumetric wear rate (mm3/yrs.)

157 ± 139

144 ± 119

0.774b

 

127 (0-815)

107 (12-467)

 
  1. Mean ± SD (standard deviation), Median (Range), a Student's t-test, b Mann-Whitney U-test, PE-polyethylene