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Between January 1961 and December 1972, 132 patients over twenty years old with idiopathic scoliosis were surgically treated using Harrington instrumentation and fusion techniques. All patients were seen by us because of curve magnitude or symptoms secondary to scoliosis. The average correction obtained at operation was 48 per cent. Twenty-four patients had early complications. Fifty-two had late complications, the most frequent of which was pseudarthrosis. The majority of patients had significant improvement in symptoms as a result of surgical correction and stabilization.