Table. 1.
Comparison of the mean size of the ossific nucleus between study groups
| No. of hips (% of referrals) | Size of ossific nucleus, mm (95% CI) | p-value | |
|---|---|---|---|
| Treatment | |||
| 12 weeks | 292 (27) a | 9.7 (9.5–10.0) | < 0.001 b |
| 6 weeks | 138 (14) | 10.1 (9.8–10.4) | < 0.001 b |
| Reference group | 502 (59) | 11.3 (11.1–11.5) | |
| 12 weeks, stable hips | 67 | 10.4 (9.9–10.9) | 0.002 b |
| 6 weeks, stable hips | 51 | 10.3 (9.8–10.8) | 0.003 b |
| Clinical findings | |||
| Dislocated | 194 | 9.4 (9.1–9.8) | 0.01 c |
| Unstable | 118 | 10.1 (9.7–10.4) | |
| Stable | 620 | 11.1 (10.9–11.3) | < 0.001 c |
| Ortolani-positive | 64 | 8.7 (8.0–9.3) | 0.001 d |
| Barlow-positive | 130 | 9.8 (9.4–10.2) | |
| Sex | |||
| Girls, reference group | 342 | 11.6 (11.3–11.9) | < 0.001 e |
| Boys, reference group | 160 | 10.7 (10.2–11.3) | |
a
In total, neonatal instability of the hip (NIH) was left-sided in 103 (43%), right-sided in 31 (13%), and bilateral in 105 (44%) of 239 children. In the 152 children with dislocated hips, 60 (39%) were bilateral and 23 (15%) had an unstable contralateral hip. Note that the percentages given relate to all referrals, including those that did not meet inclusion criteria for analysis of the diameter of the ossific nucleus.
b
Comparison with reference group.
c
Comparison with unstable group.
d
Comparison with Barlow-positive.
e
Girls compared to boys in cases with bilaterally stable hips.