Secondary Salter osteotomy Primary Salter osteotomy Mean CE angle at final outcome 3430.1 Mean Mose circle indices2.5mm2.4mm Avascular necrosis at final follow-up 50%31% Severin grade 1,2 (good)75%81%
Effects of primary Salter osteotomy compared to no Salter osteotmy: 1- Femoral head is better 2- Acetabulum provided better coverage 3- Avascular necrosis is less 4- higher good results according to Severin classification
Without Salter osteotomy With Salter osteotomy No. of hips3326 Mean age at 1 st op. (years)4.93.6 Mean radiological follow-up (years)11.39.6 Mean pre-op. acetabular index3535.2 Subsequent surgery57.5%23% Mean CE angle at final follow-up26.530.1 Mean Mose circle indices3.8mm2.4mm Avascular necrosis incidence at final follow-up 57.5%31% Severin grade 1 or 2 (good)63%81%
In comparing results of primary and secondary Salter osteotomy: Better end results for primary Salter osteotomy, even though this group was more dysplastic at the start.