Table 1 Comparison of patients’ basic characteristics between different groups BMI. Body mass index, K-L Grade. Kellgren-Lawrence Grade

Preoperative valgus

≤ 4°

4° to 7°

≥ 7°

Difference

N

9

15

27

Age

56.89 ± 4.26

60.87 ± 8.53

62.48 ± 8.26

n.s.

BMI

24.74 ± 2.20

26.24 ± 3.70

27.39 ± 4.56

n.s.

Gender (Male/Female)

2/7

4/11

10/17

n.s.

K-L Grade (II/III/IV)

3/6/0

3/11/1

9/12/6

n.s.

Postoperative valgus

≤-3°

-3° to 3°

≥ 3°

Difference

N

10

17

24

Age

57.80 ± 4.13

62.41 ± 9.29

61.38 ± 8.00

n.s.

BMI

24.90 ± 2.53

27.09 ± 3.24

26.93 ± 4.93

n.s.

Gender (Male/Female)

3/7

5/12

8/16

n.s.

K-L Grade (II/III/IV)

2/7/1

6/8/3

7/14/3

n.s.