European Portuguese version of the functional disability inventory: translation and cultural adaptation, validity, and reliability in adolescents with chronic spinal pain.

The European Portuguese version of the FDI has very good internal consistency, good test-retest reliability, and construct validity when used in a sample of community adolescents with chronic pain.Implications for rehabilitationOne of the most widely instruments used to assess functional disability is the Functional Disability Inventory (FDI), which in its original version has good psychometric properties and is recommended by the Pediatric Initiative on Methods, Measurement, and Pain Assessment in Clinical Trials;However, the FDI has not been translated yet into European Portuguese language and its psychometric properties have not been assessed in adolescents with chronic spinal pain;This study suggests that the European Portuguese version of the FDI has very good internal consistency, good test-retest reliability as well as construct validity when used in a sample of community adolescents with chronic spinal pain;Therefore, these findings suggest the use of the European Portuguese version of the FDI to assess the functional disability in adolescents with chronic spinal pain.