Harrington and Cotrel-Dubousset Instrumentation in Adolescent Idiopathic Scoliosis
Charles T. Price, MD

To The Editor:

The article by Helenius et al., “Harrington and Cotrel-Dubousset Instrumentation in Adolescent Idiopathic Scoliosis. Long-Term Functional and Radiographic Outcomes” (2003;85:2303-9), is an excellent attempt to compare an older method with a newer method. Changes in techniques are often made for theoretical reasons without proven benefit. Then it becomes difficult to perform randomized contemporaneous studies of efficacy. The authors have indicated some of the limitations of this historical method of comparison.

However, it should be noted that there were more than four times the number of lumbar curves (King type-I) in the Harrington group than in the Cotrel-Dubousset group in the study by Helenius et al. Did this represent a change in the selection of …

Corresponding author: Ilkka Helenius, MD, PhD Hospital for Children and Adolescents Helsinki University Central Hospital P.O. Box 281 Helsinki FIN-00029 HUS Finland ilkka.helenius{at}helsinki.fi

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