Table 3 Comparison stress X-ray data 3, 6, and 12 months postoperatively in the two groups

3 months

(n = 8)

(n = 9)

 30° flexion (mm)

0.46 ± 0.19

3.39 ± 0.28

< 0.001

 90° flexion (mm)

0.79 ± 0.25

3.19 ± 0.21

< 0.001

6 months

(n = 20)

(n = 19)

 30° flexion (mm)

1.15 ± 0.25

2.96 ± 0.28

< 0.001

 90° flexion (mm)

0.76 ± 0.19

2.73 ± 0.25

< 0.001

12 months

(n = 9)

(n = 17)

 30° flexion (mm)

1.47 ± 0.40

2.87 ± 0.34

0.018

 90° flexion (mm)

0.89 ± 0.25

2.74 ± 0.30

< 0.001