This study aimed to compare the Italian Spine Youth Quality of Life Questionnaire (ISYQOL-PL) versus the Scoliosis Research Society-22 (SRS-22) questionnaire scores evaluating the validity of the concurrent and known-groups. Eighty-one girls (mean age 13.5 ± 1.8 years) with idiopathic scoliosis (IS) with a mean Cobb angle of 31.0 (±10.0) degrees were examined, all treated with a corrective TLSO brace for an average duration of 2.6 (±1.9) years. The patients’ scores were compared as follows: (1) age: ≤13 years vs. >13 years); (2) scoliosis severity: mild (Cobb angle 10–30°) vs. moderate (Cobb angle > 30°); (3) single curve pattern vs. double curve pattern. Lin’s concordance correlation coefficient was used to evaluate the strength of the association between ISYQOL-PL and SRS-22 scores. t-tests were applied to assess if the ISYQOL-PL measure and SRS-22 total score were significantly different in the different groups of patients. The concurrent validity analysis showed a moderate correlation (Lin p_ccc = 0.47). The ISYQOL-PL showed a significantly better quality of life in mild than moderate scoliosis. The severity of scoliosis but not the age or the curve pattern demonstrated a direct statistically significant effect on patients’ quality of life only when evaluated using the ISYQOL-PL.

Background: Currently, there is a deficit of questionnaires available in Polish for as-sessing the quality of life of children with limb deformities. The LD-SRS questionnaire consists of 30 questions in 5 domains: function, experienced pain, patient's own ap-pearance, mental health and satisfaction with management, scored on a 1–5 scale, where higher scores indicate better quality of life. The aim was to culturally adapt and validate the LD-SRS questionnaire into Polish. Methods: The questionnaire has been translated from English into Polish by two translators. An expert team composed of physicians, nurses and a psychologist analysed the translations and developed the initial Polish version. It was translated back into English and analysed for the differences from the original to work out the pre-final version. After approval by the local ethics committee, the pre-final version was applied to a group of 21 patients as a pilot study. Then, the final version of the form was developed and tested once on the group of 77 children, mean age 13.9 years (8-20 years), and twice on the group of 34 children, mean age 15.9 years (12-19 years). The retest was obtained within 7 days (4-15 days). Results: The Cronbach’s alpha was 0.92, showing excellent internal consistency. The ICC value for total LD-SRS score (0.99) signified excellent reliability. The overall total LD-SRS score was 3.8 (SD=0.6). The results in each category were: function/activity 3.4 (SD=0.7), pain 3.9 (SD=1.0), self-image 3.5 (SD=0.7), mental health 3.6 (SD=1.0), satisfaction with management 4.2 (SD=0.8). We found no floor or ceiling effect for the total LD-SRS score. Conclusions: The Polish version of the LD-SRS questionnaire was found to be a reliable instrument with excellent internal consistency and can be used in assessing the quality of life of children treated for limb deformities.