Table 3 Postoperative radiological results of study participants and comparison between the new implants

BG group

(n = 19)

Number

11

8

Correction of malalignment after revision

Varus correction (°)

6.2 ± 2.4 (0–9.0)

6.1 ± 2.7 (0.0–8.0)

0.840

Sagittal correction (°)

3.2 ± 3.7 (0–12.0)

2.5 ± 1.6 (0.0–4.5)

0.904

Gap reduction (mm)

3.0 ± 1.6 (1.0–6.0)

2.9 ± 0.6 (2.0–4.0)

0.968

Alignment after revision

Neck-shaft angle (°)

124.5 ± 2.5 (120.0–130.0)

123.9 ± 1.4 (122.0–125.0)

0.840

Difference from contralateral side (°)

3.9 ± 1.2 (2.0–6.0)

3.8 ± 1.3 (2.0–6.0)

0.778

Sagittal anterior angulation (°)

2.5 ± 0.9 (1.0–4.0)

3.1 ± 1.2 (1.0–5.0)

0.310

Fracture gap (mm)

1.7 ± 0.6 (1.0–3.0)

1.9 ± 0.6 (1.0–3.0)

0.657

Non-BG group

(n = 18)

Number

14

4

Correction of malalignment after revision

Varus correction (°)

3.9 ± 2.1 (0.0–6.0)

4.8 ± 1.5 (3.0–6.0)

0.505

Sagittal correction (°)

0.4 ± 0.6 (0.0–2.0)

1.1 ± 0.9 (0.0–2.0)

0.158

Gap reduction (mm)

2.5 ± 1.4 (1.0–6.0)

2.8 ± 0.5 (2.0–3.0)

0.574

Alignment after revision

Neck-shaft angle (°)

123.7 ± 1.8 (121.0–127.0)

124.3 ± 2.1 (122.0–127.0)

0.574

Difference from contralateral side (°)

3.4 ± 1.1 (2.0–5.0)

3.3 ± 2.2 (1.0–6.0)

0.798

Sagittal anterior angulation (°)

3.4 ± 1.6 (1.0–7.0)

4.3 ± 3.0 (1.0–8.0)

0.645

Fracture gap (mm)

1.6 ± 0.6 (1.0–3.0)

2.0 ± 0.8 (1.0–3.0)

0.442

All participants

(n = 37)

Number

25

12

Correction of malalignment after revision

Varus correction (°)

4.9 ± 2.4 (0.0–9.0)

5.7 ± 2.4 (0.0–8.0)

0.296

Sagittal correction (°)

1.7 ± 2.8 (0.0–12.0)

2.0 ± 1.5 (0.0–4.5)

0.095

Gap reduction (mm)

2.7 ± 1.5 (1.0–6.0)

2.8 ± 0.6 (2.0–4.0)

0.491

Alignment after revision

Neck-shaft angle (°)

124.0 ± 2.1 (120.0–130.0)

124.0 ± 1.5 (122.0–127.0)

0.786

Difference from contralateral side (°)

3.6 ± 1.2 (2.0–6.0)

3.6 ± 1.6 (1.0–6.0)

0.987

Sagittal anterior angulation (°)

3.0 ± 1.4 (1.0–7.0)

3.5 ± 1.9 (1.0–8.0)

0.511

Fracture gap (mm)

1.7 ± 0.6 (0.0–12.0)

1.9 ± 0.7 (1.0–3.0)

0.360