Records of Quantec measurements of the kyphotic curvature of the back were reviewed for all patients attending the children's orthopaedic clinic who were referred for back shape measurements. Of these, 57 children had five or more visits allowing trends to be calculated. Linear trends were found in 30 of the patients, with gradients ranging from 1.1º/yr to 7.2º/yr, but no significant higher order trends were found. On average, the scatter of measurements about the trend line, or about the mean value in the other 27 cases, compared well with that expected from repeatability studies but the amount of scatter varied from one study to another. This may well be due to sampling. Where such measurements are monitored for evidence of change in an individual patient, the possibility of larger than average scatter about any emerging trend should be considered.
McArdle FJ, Griffiths CJ, Macdonald AM, Gibson MJ. Monitoring the thoracic sagittal curvature in kyphoscoliosis with surface topography: a trend analysis of 57 patients. In: Grivas TB, editor. Research into Spinal Deformities 4. Amsterdam: IOS Press, 2003; 199-203.
Dr Frank McArdle, Freeman Unit, Newcastle upon Tyne. Tel: +44 (0)191-223-6161.
Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, NE7 7DN, UK.
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