Cross-cultural Adaptation of the Oswestry Disability Index: From English to Ilokano Version

Abstract

Background and Objective. The Oswestry Disability Index (ODI)–English is a valid and reliable instrument for disability measurement in low back pain (LBP) patients. There is no existing ODI–Ilokano that evaluates LBP patients. This study aimed to cross-culturally adapt the ODI–English into Ilokano.

Methods. The ODI–English was cross-culturally adapted into Ilokano through a process that included forward translation, synthesis of the translations, back translation, expert committee review, and testing of the pre-final version.

Results. Forward translation focused on capturing the essence of terms related to pain intensity, personal care, and daily activities, achieving consensus on phrases that accurately mirrored the original English meanings. Subsequent synthesis refined these translations, emphasizing idiomatic and conceptual equivalence over literal interpretations, particularly in nuanced areas like sleep disturbance and social life activities. Backward translation processes aligned Ilokano and English terms, especially for pain intensity and personal care, ensuring consistency across languages. The expert committee review addressed spelling, word choice, and sentence structure, making strategic adjustments for cultural relevance. Pilot testing with participants from Ilocos Norte and Ilocos Sur, Philippines highlighted comprehension challenges with specific terms, leading to adaptations like replacing 'milya' and 'yarda' with metric units and retaining culturally sensitive terms with supplementary English explanations.

Conclusion. This study refined the ODI–English into a culturally adapted Ilokano version, focusing on semantic, idiomatic, and cultural equivalence. Incorporating pilot testing feedback, such as modifying measurement units and addressing sensitive terms, highlighted the thorough adaptation process. The collaborative translation efforts and diverse patient input ensured a culturally resonant ODI version for Ilokano speakers. This adaptation enhances physical therapy practices by improving patient assessments and advocates for adapting patient-reported outcomes to diverse cultures, advancing patient-centered care.