%0 Journal Article %T Conservative treatment of main thoracic adolescent idiopathic scoliosis: Full %A Ilkka Helenius %A Markus Lastikka %A Martin Gehrchen %A S£¿ren Ohrt-Nissen %A Thomas Borbjerg Andersen %J Journal of Orthopaedic Surgery %@ 2309-4990 %D 2019 %R 10.1177/2309499019860017 %X To compare treatment efficacy between the Boston full-time brace and the Providence part-time brace in main thoracic adolescent idiopathic scoliosis (AIS). Patients were treated with either the Boston brace (n = 37) or the Providence brace (n = 40). Inclusion criteria were Risser grade ¡Ü2, major curve between 25¡ã and 40¡ã with the apex of the curve between T7 and T11 vertebrae. Two-year follow-up was available in all patients unless brace treatment had reached endpoint. The primary outcome measure was main curve progression to ¡Ý45¡ã. Median age was 12.6 years and median treatment length at follow-up was 25 months (interquartile range (IQR): 18¨C32)) with no difference between the groups (p ¡Ý 0.116). Initial median main Cobb angle was 29¡ã (IQR: 27¨C33) and 36¡ã (IQR: 33¨C38) in the Boston and Providence groups, respectively (p < 0.001). At follow-up, 13 patients (35%) had progressed to ¡Ý45¡ã in the Boston group versus 16 patients (40%) in the Providence group (p = 0.838). Twenty-three patients (62%) had progressed by more than 5¡ã in the Boston group versus 22 patients (55%) in the Providence group (p = 0.685). The secondary thoracolumbar/lumbar curve progressed by more than 5¡ã in 14 (38%) and 18 (45%) in the Boston and Providence groups, respectively (p = 0.548). Despite a larger initial curve size in the Providence group, progression of more than 5¡ã or to surgical indication area was similar in the Boston group. Our results indicate that nighttime bracing is a viable alternative to full-time bracing also in main thoracic AIS %K adolescent %K braces %K disease progression %K orthotic devices %K scoliosis %K scoliosis/therapy %U https://journals.sagepub.com/doi/full/10.1177/2309499019860017