PurposeIn the presented study, we aimed to assess changes over time in the perception of trunk deformity, body function, stress level and mental health in females with adolescent idiopathic scoliosis (AIS) who were treated conservatively with a Cheneau brace, taking the Trunk Appearance Perception Scale (TAPS), Scoliosis Research Society-22 (SRS-22) and Bad Sobberheim Stress Questionnaires (BSSQ) criteria of evaluation into consideration.MethodsThe study design was comprised of three questionnaire assessments, with the second and the third evaluation taking place 6 and 12 months after the beginning of the study, respectively. Thirty-six females treated conservatively were asked to fill in the TAPS, SRS-22 and BSSQ forms.ResultsIn regards to TAPS, the results differed between the 1st and the 2nd assessment in Figure 2 only (p = 0.013). The difference between the 1st and the 3rd evaluation concerned Figure 3 and the total score (p = 0.011 and p = 0.005, respectively). The SRS-22 and BSSQ results of study participants did not differ significantly between the 1st and the 2nd, between the 2nd and the 3rd and between the 1st and the 3rd evaluations.ConclusionsThe study indicated that the assessment of girls with AIS concerning body function and mental health did not deteriorate in the course of orthosis treatment. Furthermore, they showed improvement in perceptions particularly in regards to trunk shape. We pointed out that the negative perceptions of mental health, self-image and low level of activity held by females with AIS coexisted with severe emotional distress. Moreover, factors that improved functioning or subjective physical appearance ratings in particular, such as level of activity, were indicated.