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Table 4 Prognostic factor analyses: subgroup comparisons of the effects of patient characteristics on fixation failure

From: Treatment of displaced transverse fractures of the patella: modified tension band wiring technique with or without augmented circumferential cerclage wire fixation

Variables

Fixation Failure

Union

P Value

OR (95% CI)

P Value

All patients, n (%)

(n = 4)

(n = 68)

   

 Patient age > 60 years

4 (100.0)

36 (52.9)

0.124

8.0 (0.4–154.6)

0.168

 Patient age > 70 years

3 (75.0)

29 (42.6)

0.321

4.0 (0.4–40.8)

0.237

 Female patients

2 (50.0)

43 (63.2)

0.628

0.6 (0.1–4.4)

0.599

 AO/OTA type 34 C2 fracture

0 (0.0)

13 (19.1)

1.000

0.5 (0.0–9.0)

0.607

 Superficial level of the K-wires

3 (75.0)

22 (32.3)

0.117

6.3 (0.6–63.8)

0.121

 Narrow K-wire distance

2 (50.0)

40 (58.8)

1.000

0.7 (0.1–5.3)

0.729

 Without postoperative splinting

2 (50.0)

30 (44.1)

1.000

1.3 (0.2–9.5)

0.818

Group 1 patients, n (%)

(n = 2)

(n = 25)

   

 Patient age > 60 years

2 (100.0)

11 (44.0)

0.222

6.3 (0.3–144.7)

0.249

 Patient age > 70 years

1 (50.0)

10 (40.0)

1.000

1.5 (0.1–26.9)

0.783

 Female patients

1 (50.0)

15 (60.0)

1.000

0.1 (0.0–3.1)

0.212

 AO/OTA type 34 C2 fracture

0 (0.0)

6 (24.0)

1.000

0.6 (0.0–14.2)

0.752

 Superficial level of the K-wires

2 (100.0)

5 (20.0)

0.060

18.6 (0.8–447.7)

0.071

 Narrow K-wire distance

1 (50.0)

11 (44.0)

1.000

1.3 (0.1–22.7)

0.870

 Without postoperative splinting

1 (50.0)

10 (40.0)

1.000

1.5 (0.1–26.9)

0.783

Group 2 patients, n (%)

(n = 2)

(n = 43)

   

 Patient age > 60 years

2 (100.0)

25 (58.1)

0.509

3.6 (0.2–80.1)

0.415

 Patient age > 70 years

2 (100.0)

19 (44.2)

0.212

6.3 (0.3–138.6)

0.244

 Female patients

1 (50.0)

28 (65.1)

1.000

0.5 (0.0–9.2)

0.667

 AO/OTA type 34 C2 fracture

0 (0.0)

7 (16.3)

1.000

1.0 (0.0–22.4)

0.987

 Superficial level of the K-wires

1 (50.0)

17 (39.5)

1.000

1.5 (0.1–26.1)

0.769

 Narrow K-wire distance

1 (50.0)

29 (67.4)

1.000

0.5 (0.0–8.3)

0.616

 Without postoperative splinting

1 (50.0)

20 (66.7)

1.000

1.2 (0.1–19.6)

0.923

  1. *P value < 0.05 is significant
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BMC Musculoskeletal Disorders

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