Table 4.
Independent variables related to the need for secondary surgical intervention according to univariate analysis
| Variables | Secondary surgery (+) | Secondary surgery (−) | p value |
|---|---|---|---|
| Age at the time of closed reduction (months) (mean ± SD) | 8.4 ± 1.6 | 7.9 ± 1.4 | 0.32 |
| Previous harness or brace treatment (+/−) (n)a | 16/16 | 33/8 | 0.61 |
| Adductor tenotomy (+/−) (n) | 13/11 | 9/32 | 0.01 |
| Casting duration (weeks) (mean ± SD) | 11.3 ± 3.4 | 10.6 ± 2.7 | 0.36 |
| IHDI Grade 3/4 (n)a | 11/13 | 27/14 | 0.03 |
| First admission AI (°) (mean ± SD)a | 37.3 ± 3.5 | 35.4 ± 2.7 | 0.03 |
| Avascular necrosis during follow-up (+/−) (n) | 8/16 | 4/37 | 0.01 |
statistically significant p values are in bold
SD standard deviation, IHDI International Hip Dysplasia Institute
aValues just before the closed reduction, not before the secondary surgery