Table 4 Clinical and radiographic outcomes stratified by stem type

Modified Harris hip score

 Postoperative

87.3 ± 11.9

(47–100)

89.3 ± 9.6

(56–100)

 Net improvement

29.9 ± 17.7

(-27–80)

24.3 ± 14.8

(-21–68)

 Minimal clinically important difference

330 (84.0%)

314 (81.8%)

Canal fill ratio (CFR)

 2 cm above the lesser trochanter

0.64 ± 0.14

(0.42–1.06)

0.66 ± 0.16

(0.34–1.35)

 At the level of the lesser trochanter

0.68 ± 0.13

(0.46–1.07)

0.76 ± 0.13

(0.16–1.12)

 7 cm below the lesser trochanter

0.93 ± 0.16

(0.55–1.52)

0.96 ± 0.16

(0.54–1.47)

Femoral offset

 Postoperative

47.9 ± 9.5

(10.3–98.0)

49.8 ± 8.6

(28.8–105.0)

 Absolute net change (continuous)

6.5 ± 7.2

(0.0–46.0)

6.4 ± 5.9

(0.0–43.0)

Net change (categorical)

 Offset increased by ≥ 3 mm

140 (35.6%)

163 (42.4%)

 Offset remained within 3 mm

127 (32.3%)

117 (30.5%)

 Offset decreased by ≥ 3 mm

118 (30.0%)

94 (24.5%)

 Missing

8 (2.0%)

10 (2.6%)

Limb length discrepancy (LLD)

 Absolute difference

3.0 ± 2.6

(0.0–25.3)

2.9 ± 2.4

(0.0–22.2)

Difference (categorical)

 Difference ≥ 3 mm

144 (36.6%)

146 (38.0%)

 Difference within 3 mm

227 (57.8%)

221 (57.6%)

 Missing

22 (5.6%)

17 (4.4%)

Subsidence ≥ 3 mm

4 (1.0%)

2 (0.5%)

Alignment

 Aligned within 3°

355 (90.3%)

333 (86.7%)

 Valgus

10 (2.5%)

15 (3.9%)

 Varus

23 (5.9%)

33 (8.6%)

 Missing

5 (1.3%)

3 (0.8%)