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Age at reduction and final followup in relation to grade of ON
| Age | Group 0 (69 hips) | Group A (23 hips) | Group B (41 hips) |
|---|---|---|---|
| Age at reduction (months) | 18.8 (2–65) | 13.6 (2–27) | 21.2 (6–117) |
| Age at final followup (years) | 11.0 (6–20.4) | 13.4 (6.3–24) | 14.3 (6–26.3) |
Values are expressed as mean, with range in parentheses; p = 0.11 using Kruskal-Wallis test. ON = osteonecrosis.
