Table 2 Outcomes of meta-analysis and subgroup analysis
Outcome of interest | No. of studies | No. of hips | No. of events | Pooled estimate | 95% CI | Study heterogeneity | ||
|---|---|---|---|---|---|---|---|---|
χ2 | I2 | P value | ||||||
Nonunion | 39 | 791 | 27 | 3.79% | (2.60%, 5.20%) | 39.25 | 3.2% | 0.414 |
Modified subgroup | 15 | 241 | 5 | 3.03% | (1.29%, 5.51%) | 8.29 | 0.0% | 0.874 |
Transverse subgroup | 24 | 550 | 22 | 4.14% | (2.67%, 5.20%) | 30.34 | 24.2% | 0.140 |
Nerve palsy | 33 | 712 | 14 | 2.63% | (1.60%, 3.87%) | 21.9 | 0.0% | 0.910 |
Dislocation | 27 | 641 | 38 | 5.88% | (4.22%, 7.80%) | 42.35 | 36.2% | 0.030 |
Modified subgroup | 9 | 163 | 9 | 5.47% | (2.57%, 9.36%) | 12.99 | 38.4% | 0.112 |
Transverse subgroup | 18 | 478 | 29 | 6.03% | (4.14%, 8.29%) | 29.28 | 38.5% | 0.045 |
Revision | 22 | 482 | 45 | 8.90% | (6.56%, 11.50%) | 45.57 | 53.9% | 0.001 |
Modified subgroup | 8 | 148 | 10 | 6.66% | (3.31%, 11.12%) | 14.04 | 50.1% | 0.050 |
Transverse subgroup | 14 | 334 | 35 | 9.96% | (7.06%, 13.35%) | 29.99 | 56.7% | 0.005 |
Limb-length discrepancy | 7 | 132* | 10* | 6.31% | (2.90%, 11.00%) | 18.37 | 67.3% | 0.005 |
Modified subgroup | 4 | 72 | 8 | 9.02% | (3.64%, 16.40%) | 13.86 | 78.4% | 0.003 |
Transverse subgroup | 3 | 60 | 2 | 3.72% | (0.50%, 9.72%) | 2.83 | 29.3% | 0.243 |
HHS improvement | 17 | 337 | / | 26.79% | (26.35%, 27.32%) | 654.87 | 97.6% | <0.001 |
Modified subgroup | 6 | 107 | / | 27.41% | (26.52%, 28.31%) | 569.55 | 99.1% | <0.001 |
Transverse subgroup | 11 | 230 | / | 26.61% | (25.99%, 27.14%) | 82.56 | 87.9% | <0.001 |
Deep infection | 19 | 393 | 1 | 1.34% | (0.46%, 2.67%) | 2.24 | 0.0% | 1.000 |