Table 3 Radiographic evaluation
| Â | Stable group (n = 76) | Unstable group (n = 14) | P value | ||
mean ± SD | (range) | mean ± SD | (range) | ||
Canal flare index | 3.6 ± 0.7 | (2.2–5.5) | 4.3 ± 1.0 | (2.7–6.1) | 0.0262 |
Canal filling ratio (%) | |||||
 Resection line | 65.7 ± 7.7 | (51.1–86.7) | 60.6 ± 5.7 | (51.1–71.8) | 0.0228 |
 Half the height of the sleeve | 69.3 ± 9.3 | (44.8–90.0) | 61.3 ± 9.3 | (50.9–87.1) | 0.002 |
 Distal end of the sleeve | 82.5 ± 8.1 | (61.8–95.5) | 71.0 ± 4.8 | (66.7–85.6) | <0.0001 |
 Half the height of the stem | 86.9 ± 5.3 | (73.8–95.9) | 80.1 ± 6.1 | (70.4–89.8) | 0.0005 |
 Distal end of the sleeve on the lateral view | 80.2 ± 8.5 | (52.7–95.8) | 68.8 ± 8.8 | (47.7–84.8) | <0.0001 |
 Half the height of the stem on the lateral view | 69.4 ± 6.4 | (54.5–85.9) | 63.5 ± 9.5 | (39.3–77.6) | 0.0197 |
| Â | Hips | Â | Hips | Â | Â |
Champagne flute/normal/stovepipe | 6/59/11 | Â | 7/5/2 | Â | Â |
| Â | Stable group (n=88) | Unstable group (n = 16) | P value | ||
| Â | Hips | (%) | Hips | (%) | |
Preoperative stem alignment | |||||
 Neutral/Varus/Valgus | 87/1/0 |  | 16/0/0 |  |  |
Stem alignment at final follow up | |||||
 Neutral/varus/valgus | 85/3/0 |  | 12/4/0 |  |  |
Stem alignment change | |||||
 < 2° | 87 | 98.9 | 9 | 56.2 |  |
 ≥ 2° varus | 1 | 1.1 | 7 | 43.8 | <0.0001 |
Radiolucent line around the sleeve (> 50%) | |||||
 Postoperative 1 year | 1 | 0.9 | 18 | 100 | <0.0001 |
 Final follow-up | 0 | 0 | 18 | 100 | <0.0001 |
Stress shielding (grade 3/grade 4) | 5/4 | 4.5/3.6 | Â | Â | Â |