Table 3 Intraoperative and postoperative radiological data comparing the procedure using a conventional jig and computer-assisted surgery

Time (min)

14 ± 5 (7–29)

18 ± 6 (11–33)

0.028

Frontal plane

Deviation (°)

7.4 ± 4.4 (–17– 5)

1 ± 1.7 (–8–3)

<0.01

Outliers > 5°

15 (55.6%)

1 (3.7%)

<0.01

Implanted in:

Planned angle

0

13 (48.1%)

n.a.

Varus alignment

20 (74.1%); 8.8 ± 4.3°

4 (14.8%); 3.5 ± 3.3°

n.a.

Valgus alignment

7 (25.9%); 3.4 ± 1.3°

10 (37.0%); 1.4 ± 0.7°

n.a.

Physiological

7.0 ± 3.6°

1.4 ± 2.8°

<0.01

Osteoarthritis

8.1 ± 4.7°

0.6 ± 0.5°

<0.01

SCFE

7.0 ± 5.0°

1.1 ± 1.1°

<0.01

Axial plane

Deviation (°)

5.1 ± 3.1 (–12–9)

3.9 ± 2.9 (–8–10)

0.13

Outliers > 5°

12 (44.4%)

8 (29.6%)

0.26

Implanted in:

Planned angle

3 (11.1%)

1 (3.7%)

n.a

Anteversion

12 (44.4%); 6.0 ± 2.2°

20 (74.1%); 4.4 ± 2.8°

n.a.

Retroversion

12 (44.4%); 5.4 ± 3.2°

6 (22.2%); 2.8 ± 2.8°

n.a

Physiological

5.0 ± 3.7

2.5 ± 1.7

n.a.

Osteoarthritis

5.8 ± 1.9

6.3 ± 2.6

n.a.

SCFE

4.4 ± 3.6

2.8 ± 2.5

n.a.

Notching

8 (29.6%)

0

<0.01