Cross-Cultural Validation of the Italian Version of the Bt-DUX: A Subjective Measure of Health-Related Quality of Life in Patients Who Underwent Surgery for Lower Extremity Malignant Bone Tumour

Mattia Morri, Peter Willem Bekkering, Marco Cotti, Matilde Meneghini, Enrico Venturini, Alessandra Longhi, Elisabetta Mariani, Cristiana Forni, Mattia Morri, Peter Willem Bekkering, Marco Cotti, Matilde Meneghini, Enrico Venturini, Alessandra Longhi, Elisabetta Mariani, Cristiana Forni

Abstract

The purpose of this study was to translate the English bone tumour DUX (Bt-DUX-Eng) questionnaire for lower extremity bone tumour patients, a disease-specific quality of life (QoL) instrument, into Italian and then examine the validity of the Italian version of Bt-DUX (Bt-DUX-It). The adaptation and translation process included forward translation, back-translation, and a review of the back-translation by an expert committee. The Bt-DUX-It was validated in a sample of adolescents treated for lower extremity osteosarcoma in Italy. Assessments included the Bt-DUX, the Toronto Extremity Salvage Score (TESS), and the European Organization for Research and Treatment Core Quality of Life Questionnaire of Cancer Patients (EORTC QLQ-C30). Fifty-one patients with a median age of 20 years (range: 15-25) completed the questionnaires. The mean Bt-DUX score was 70 (range: 16.30-100). The internal consistency of the overall score and that of the Bt-DUX-It was good: Cronbach's α was 0.95. Spearman's correlation coefficient between the Bt-DUX (total and domain scores) and EORTC QLQ C30 and TESS were overall moderate to good, reaching a p-value <0.01 in all cases. The Bt-DUX-It version is a useful tool for measuring QoL in patients with bone tumour and has similar internal consistency, construct validity, and discrimination as those of the Dutch and English versions.

Keywords: lower limb surgery; osteosarcoma; quality of life; survey and questionnaire; validation study.

Conflict of interest statement

The authors declare no conflicts of interest.

Figures

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Figure 1
Enrolment process.
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Figure 2
Ceiling or floor effects.

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