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Table 2 Unexpected angular deformity after varization and derotation of the model according to inclination of the cutting plane

From: Unexpected angular or rotational deformity after corrective osteotomy

Varization (angle α)

 

Derotation

10°

20°

30°

40°

50°

60°

3D angle

0.9

1.7

2.6

3.4

4.2

5.0

Valgus

0.1

0.3

0.7

1.2

1.8

2.5

Extension

0.9

1.7

2.5

3.2

3.8

4.3

10°

3D angle

1.7

3.5

5.2

6.8

8.4

10.0

Valgus

0.1

0.6

1.3

2.3

3.5

5.0

Extension

1.8

3.5

5.0

6.5

7.7

8.7

15°

3D angle

2.6

5.2

7.7

10.2

12.6

14.9

Valgus

0.2

0.9

1.9

3.4

5.2

7.4

Extension

2.7

5.2

7.6

9.8

11.6

13.1

20°

3D angle

3.4

6.8

10.2

13.4

16.6

19.7

Valgus

0.3

1.1

2.5

4.4

6.8

9.7

Extension

3.6

7.1

10.3

13.2

15.6

17.5

25°

3D angle

4.2

8.4

12.6

16.6

20.6

24.4

Valgus

0.3

1.3

3.0

5.3

8.3

11.9

Extension

4.6

9.1

13.1

16.7

19.7

22.0

30°

3D angle

5.0

10.0

14.9

19.7

24.4

29.0

Valgus

0.4

1.5

3.4

6.1

9.6

13.9

Extension

5.7

11.2

16.1

20.4

23.9

26.6

35°

3D angle

5.7

11.4

17.1

22.6

28.1

33.3

Valgus

0.4

1.7

3.8

6.8

10.8

15.7

Extension

6.9

13.5

19.3

24.2

28.2

31.2

40°

3D angle

6.4

12.8

19.2

25.4

31.5

37.5

Valgus

0.4

1.7

4.0

7.3

11.7

17.2

Extension

8.3

16.0

22.8

28.3

32.7

36.0

45°

3D angle

7.1

14.1

21.1

28.0

34.8

41.4

Valgus

0.4

1.8

4.1

7.5

12.3

18.4

Extension

9.9

18.9

26.6

32.7

37.5

40.9

50°

3D angle

7.7

15.3

22.9

30.4

37.8

45.0

Valgus

0.4

1.8

4.1

7.6

12.5

19.2

Extension

11.7

22.2

30.8

37.5

42.4

45.9

55°

3D angle

8.2

16.4

24.5

32.5

40.5

48.4

Valgus

0.4

1.7

4.0

7.4

12.4

19.5

Extension

13.9

26.0

35.5

42.6

47.6

51.0

60°

3D angle

8.7

17.3

25.9

34.5

42.9

51.3

Valgus

0.4

1.6

3.7

7.0

11.9

19.1

Extension

16.7

30.6

40.9

48.1

53.0

56.3

  1. 3D angle: angle between the axes of the proximal fragment before and after derotation.