Postural changes in patients with scoliosis in different postural positions revealed by surface topography.

Claims have been made that surface topography is an objective tool, however there are significant postural influences (relatively large technical error due to postural sway) those measurements are prone to. Purpose of this study was to help estimate these influences by measuring patients with scoliosis in three standardized postural positions. MATERIAL AND METHODS: We studied the surface-topography measurement in 100 in-patients with idiopathic scoliosis divided into different age-groups. First group: 7 to 12 years (n=12), second group: 13 to 16 years (n=51), the third 17 to 20 years (n=15) and the fourth >21 years (n=22) (7 males and 93 females). The thoracic Cobb angle was 26.4 degrees, lumbar Cobb angle 25.7 degrees. We investigated the average lateral deviation (rms) and average surface rotation (rms). Measurements were taken one day before the patients left the clinic, after a 3 or 4 week in-patient intensive rehabilitation program (SIR), in three different postures:Normal posture: no specific instructions: standing with feet in an standardized way. Conscious posture: The patients acquired this posture during intensive daily exercising. Corrected posture: The most corrected posture the patients are able to achieve by using specific muscle tension and specific breathing techniques. We compared the results between the different postures. Then we calculated the results for the different age groups. RESULTS: There are significant differences in both parameters tested, some of them more than 40% to 67% greater than the measurement error calculated. The best results were achieved in the second and the third group with the conscious posture, the adult group had the best valued in most corrected posture. For the youngest patients there were no significant changes with the different postures. CONCLUSIONS: Surface measurements can be influenced by artificial postures and therefore cannot be attributed as objective. This is why the surface measurements should be made by someone independent from the treatment process in order to exclude any bias as far as possible. Surface topography may be used for postural monitoring in the rehabilitation process of patients with scoliosis.