Table 3.
Comparison of postoperative complications and function recovery between the four groups
| FNS | FNS + CS | TCS | QCS | P value | |
|---|---|---|---|---|---|
| Screw failure | 1a(2.3%) | 0ab(0.0%) | 13b(25.5%) | 5b(23.8%) | 0.001 |
| ONFH | 3(7.0%) | 1(7.1%) | 10(19.6%) | 4(19.0%) | 0.251 |
| NSA change,° | 1.64 ± 0.69a | 0.76 ± 0.54b | 3.15 ± 0.84c | 2.50 ± 0.65d | < 0.001 |
| Femoral neck shortening | a | a | b | b | < 0.001 |
| < 5 mm | 32(74.4%) | 11(78.6%) | 20(39.2%) | 7(33.3%) | |
| 5-10 mm | 10(23.3%) | 3(21.4%) | 19(37.3%) | 8(38.1%) | |
| > 10 mm | 1(2.3%) | 0(0.0%) | 12(23.5%) | 6(28.6%) | |
| Post-Op HHS | 86.56 ± 2.79a | 89.14 ± 2.96b | 84.59 ± 3.62c | 82.68 ± 2.89d | < 0.001 |
Notes: The same letter in the figure indicates no significant difference, while different letters indicate significant difference. Abbreviations: ONFH osteonecrosis of the femoral head, NSA neck shaft angle, Post-Op HHS postoperative Harris hip score, FNS femoral neck system, FNS + CS femoral neck system combined with a cannulated screw, TCS triple cannulated screws, QCS quadruple cannulated screws