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Table 3 Multivariate analysis of risk factors for aseptic loosening after revision total knee arthroplasty

From: Influence of extension stem length and diameter on clinical and radiographic outcomes of revision total knee arthroplasty

Femur

Tibia

Potential risk factor

Crude OR

95% CI

Adjusted OR

95% CI

p

Crude OR

95% CI

Adjusted OR

95% CI

p

Age, years

0.96

0.87–1.04

0.95

0.82–1.10

0.513

0.94

0.86–1.02

0.94

0.81–1.08

0.421

Female sex

5.35

1.41–20.12

6.75

1.04–43.45

0.045*

3.42

0.92–12.55

2.67

0.38–18.80

0.323

Bone defect severity

0.30

0.07–1.22

0.10

0.01–0.82

0.032*

0.09

0.01–0.78

0.01

0.00–2.85

0.103

Prosthesis before revision

3.11

1.13–8.53

1.21

0.34–4.29

0.766

3.11

1.13–8.53

2.29

0.53–9.74

0.262

Radiographic finding

 Alignment

0.73

0.55–0.97

0.99

0.65–1.48

0.958

0.57

0.39–0.83

0.49

0.27–0.88

0.017*

 CFR0.85

0.08

0.01–0.67

0.06

0.01–0.68

0.024*

0.10

0.01–0.84

0.07

0.01–0.80

0.032*

 CFR0.7 > 2 cm

0.07

0.01–0.33

0.02

0.01–0.33

0.006*

0.21

0.05–0.77

0.33

0.06–1.72

0.188

 CFR0.7 > 4 cm

0.11

0.01–0.91

0.04

0.01–0.66

0.025*

0.14

0.02–0.71

0.23

0.03–1.48

0.123

 CFRmax

0.94

0.89–0.98

0.93

0.87–1.00

0.051

0.96

0.91–1.01

0.55

0.32–0.90

0.407

 CFR0.85 length

0.37

0.13–0.97

0.36

0.12–1.00

0.050*

0.40

0.15–1.07

0.38

0.13–1.09

0.073

 CFR0.7 length

0.50

0.31–0.79

0.43

0.23–0.79

0.007

0.70

0.52–0.94

0.76

0.55–1.03

0.081

  1. Bone defect severity was assessed using the Anderson Orthopaedic Research Institute classification. Alignment indicates the femoral-tibial angle. CFR was calculated as the ratio between the stem width and the medullary canal width. CFRx stands for CFR > x. CFRx > y indicates stem length > y for CFR larger than x. CFRx length indicates the stem length for which CFR > x. CFRmax indicates the maximum CFR over the entire length of the stem. CI, confidence interval; CFR, canal filling ratio; OR, odds ratio; *: p < 0.05