Selected parameters of pulmonary function in a group of 34 girls with late-onset idiopathic scoliosis (mean age 13,6 and mean thoracic curve of 33.5°), treated with Miami Thoraco-lumbo-sac.ral orthosis (TLSO), were tested. We found vital capacity (VC) to be 3.4 SD 0.7L, forced vital capacity (FVC) 3.2 SD 01.6L and forced expiratory volume in the 1st second (FEVl) 2.8 SD 0.6 L. After correction of thoracic curve, mean 14.08° SD 3.76 (43.3 %), achieved by TLSO, we have noticed statistically significant (p<0.01) diminution of these parameters. VC was 5.0 %, FVC 6.4 % and FEVl for 5.5 % lower in TLSO. The obvious reason for this difference is mechanical limitation to the inspiratory movement. The differences have no impact on activities of everyday life, because they can appear only in the maximal inspiratory position.
Keywords: Idiopathic scoliosis, pulmonary function, influence of ILSO.