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Table 1 Patients demographics and preoperative conditions

From: Arthroscopic ankle fusion only has a limited advantage over the open operation if osseous operation type is the same: a retrospective comparative study

 

Between-group difference (all patients)

Difference detailed into subgroup (osseous operation type: not same)

Difference detailed into subgroup (osseous operation type: same)

Internal difference of OAF group (osseous operation type: not same)

AAF

OAF

P

AAF

COO

P

AAF

SOO

P

COO

SOO

P

Number of patients

17

26

 

17

15

 

17

11

 

15

11

 

Mean of age (years) (95% CI)

54.76 ± 14.11

55.35 ± 12.52

0.891

54.76 ± 14.11

53.33 ± 14.82

0.782

54.76 ± 14.11

58.09 ± 8.35

0.441

53.33 ± 14.82

58.09 ± 8.35

0.310

Gender (Male/Female)

10/7

16/10

0.859

10/7

11/4

0.388

10/7

7/4

0.799

11/4

7/4

0.597

Smoker (No. and %)

3 (17.6%)

7 (26.9%)

0.481

3 (17.6%)

4 (26.7%)

0.538

3 (17.6%)

3 (27.3%)

0.544

4 (26.7%)

3 (27.3%)

0.973

Diabetes (No. and %)

4 (23.5%)

3 (11.5%)

0.298

4 (25.3%)

1 (6.7%)

0.190

4 (23.5%)

2 (18.2%)

0.736

1 (6.7%)

2 (18.2%)

0.364

Mean of BMI

26.55 ± 5.23

28.93 ± 5.95

0.188

26.55 ± 5.23

29.21 ± 5.22

0.162

26.55 ± 5.23

28.55 ± 7.09

0.400

29.21 ± 5.22

28.55 ± 7.09

0.786

Mean of AOFAS score (Preoperative)

36.2 ± 13.5

32.5 ± 11.8

0.347

36.2 ± 13.5

30.7 ± 12.8

0.253

36.2 ± 13.5

34.8 ± 10.5

0.780

30.7 ± 12.8

34.8 ± 10.5

0.395

Mean of follow-up time (months)

31.94 ± 11.07

34.81 ± 9.41

0.368

31.94 ± 11.07

36.53 ± 8.49

0.202

31.94 ± 11.07

32.45 ± 10.47

0.904

36.53 ± 8.49

32.45 ± 10.47

0.284

  1. AAF arthroscopic ankle fusion group, OAF open ankle fusion group (demographic composition: OAF=COO+SOO), COO complex osseous operation; SOO: simple osseous operation, BMI body mass index, AOFAS score the American Orthopedic Foot and Ankle Society score. P P values: α = 0.05, (Age, BMI, AOFAS score and follow-up time: independent-samples t-test; gender, smoker and diabetes: Chi-squared test)