Pulmonary function tests performed in adults and adolescents with idiopathic scoliosis have showed deficits in flow rates and also reductions in various lung volume compartments[4] as noted by many western authors[5,6]. Since scoliosis is also prevalent in India and the status of pulmonary function in scoliosis patients is scant in India, it is pertinent to study PFT status in scoliotic subjects. This is essential in view of the observations made by Waugh and Riseborough, who have suggested a complete analysis of PFT status in all patients with thoracic scoliosis.[7] So the present study was designed to study the effect of idiopathic scoliosis in the absence of other lung diseases on pulmonary function tests.