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We have studied retrospectively 37 hips in 36 children at an average of 91 months after simultaneous open reduction and Salter innominate osteotomy for developmental hip dysplasia. At the latest review 97.3% were clinically and 83.8% radiologically good or excellent. In three hips (8%) there were signs of avascular necrosis, but only one had been symptomatic. There were no cases of recurrent posterior displacement.

We describe a technique for measuring the stiffness of regenerate bone after leg lengthening. This allows early identification of slow healing by reference to normal patterns. We determined the time of removal of the fixator from clinical and radiological information independent of the stiffness result.In a series of 30 leg lengthenings there were no refractures when the tibial stiffness had reached 15 Nm/° or the femoral stiffness 20 Nm/°. Three refractures occurred at lower stiffness values. The technique is simple to perform, will allow a reduction in plain radiography and is recommended for routine postoperative management.

The management of developmental dysplasia of the hip, particularly the timing of closed reduction with regard to the presence of the femoral head ossific nucleus, is controversial. The clinical and radiological outcome was assessed in a strictly defined group of 48 hips in 42 patients with an average of 11.1 years follow-up. One hundred percent of patients had an excellent or good result at final follow-up; 8.3% showed evidence of avascular necrosis and six hips underwent further surgery after closed reduction. There was no relationship between the presence or absence of an ossific nucleus at the time of closed reduction and the final outcome. In this well-defined group, closed reduction is safe and provides excellent results in the long term.

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The results suggest that our classification system for chronic hematogenous osteomyelitis in children is reliable.

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