Table 2 Comparison of preoperative and postoperative radiographic measurements between spacer and HTO group

HKA (°)

Preop

−9.44 ± 2.71

−10.18 ± 3.05

0.093

POD 6 M

−1.10 ± 0.56

−0.72 ± 0.43

0.181

POD 12 M

−1.23 ± 0.47

−0.90 ± 0.52

0.392

POD 24 M

−1.25 ± 0.51

−1.12 ± 0.55

0.577

P-value

0.000***

0.000***

MPTA (°)

Preop

83.47 ± 4.09

82.82 ± 3.63

0.479

POD 6 M

92.07 ± 1.14

93.06 ± 2.25

0.503

POD 12 M

91.79 ± 1.30

93.01 ± 2.84

0.227

POD 24 M

91.44 ± 2.06

92.41 ± 3.03

0.304

P-value

0.000***

0.000***

PTS (°)

Preop

9.21 ± 3.66

9.75 ± 4.08

0.175

POD 6 M

7.33 ± 2.98

7.05 ± 3.57

0.223

POD 12 M

7.47 ± 3.09

7.46 ± 3.09

0.830

POD 24 M

7.40 ± 3.54

7.70 ± 4.49

0.454

P-value

0.009**

0.002**

CDI

Preop

1.07 ± 0.25

1.15 ± 0.39

0.695

POD 6 M

0.91 ± 0.30

0.89 ± 0.12

0.572

POD 12 M

0.96 ± 0.18

0.94 ± 0.34

0.703

POD 24 M

1.02 ± 0.44

0.99 ± 0.30

0.414

P-value

0.012*

0.020*

ISI

Preop

1.07 ± 0.39

1.04 ± 0.22

0.512

POD 6 M

1.02 ± 0.25

1.00 ± 0.17

0.705

POD 12 M

1.02 ± 0.41

1.01 ± 0.25

0.779

POD 24 M

1.03 ± 0.17

1.01 ± 0.19

0.660

P-value

0.006**

0.002**