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The appearance of avascular necrosis (AVN) in unilateral hip dysplasia after the use of the Pavlik harness on the normal contralateral side; the patients (hips) were grouped according to the length of treatment
| Months | <3 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|
| Hips with AVN | 0 | 2 | 3 | 3 | 1 | 1 | 3 | 6 |
| Number of hips | 30 | 118 | 182 | 111 | 75 | 49 | 48 | 61 |
| Incidence of AVN | 0% | 1.7% | 1.6% | 2.7% | 1.3% | 2% | 6.25% | 9.8% |
