Abstract
BackgroundThe Manchester Foot Pain and Disability Index (MFPDI) is a patient-reported outcome tool used to measure foot pain and foot-related disability. The English version of the MFPDI has been successfully translated into other European languages, but there was no Chinese version to use in Chinese-speaking communities. The cross-sectional correlational study aimed to translate the MFPDI from English into simplified Chinese (C-MFPDI) and to test its psychometric properties among people with inflammatory arthritis in Singapore.MethodsThe MFPDI was translated from English into Chinese using a forward-backward translation framework and was administered to 100 Chinese-speaking people with inflammatory arthritis. From the original 100 participants, 30 participants re-evaluated the C-MFPDI after 2 weeks. A Visual Analogue Scale and the Taiwan Chinese Foot Function Index in simplified Chinese were used to evaluate concurrent validity with the C-MFPDI. Health-related quality of life was assessed using the Chinese version of the European Quality of Life-5 Dimension to test construct validity.ResultsThe C-MFPDI had a high translation equivalent rate (96.3%) and content validity index (0.92), good internal consistency (Cronbach’s α = 0.90) and test-retest reliability (ICC = 0.87). The concurrent validity of the C-MFPDI was demonstrated to be acceptable through its significantly moderate to strong positive correlations with the Taiwan Chinese Foot Function Index (r = 0.62–0.72, p < 0.01) and Visual Analogue Scale foot pain (r = 0.65, p < 0.01). The C-MFPDI total scores were moderately negatively associated with Chinese European Quality of Life-5 Dimension utility scores (r = − 0.40, p < 0.01).ConclusionThe C-MFPDI had good psychometric properties. The C-MFPDI can be used to assess disabling foot pain, impairment and disability in Chinese-speaking people with inflammatory arthritis.
Highlights
Foot pain, impairment and disability has been reported to be under-recognised in people with inflammatory arthritis (IA) that includes rheumatoid arthritis [1,2,3,4], psoriatic arthritis [5, 6], gout [7, 8], systemic lupus erythematous [9,10,11], spondyloarthritis [12, 13] and other forms of undifferentiated IA
One pilot participant felt that the C-Manchester Foot Pain and Disability Index (MFPDI) was “generally easy to understand, difficult to answer if it did not apply to me ”
The team of forward translators looked through the comments together and did not make any changes to the C-MFPDI draft during this stage to keep the meaning of items in the C-MFPDI as close to the meaning of items in the original MFPDI as possible
Summary
Impairment and disability has been reported to be under-recognised in people with inflammatory arthritis (IA) that includes rheumatoid arthritis [1,2,3,4], psoriatic arthritis [5, 6], gout [7, 8], systemic lupus erythematous [9,10,11], spondyloarthritis [12, 13] and other forms of undifferentiated IA. Erh et al Journal of Foot and Ankle Research (2019) 12:6 trial [26] and cross-sectional studies to assess the severity and impact of disabling foot pain in people with gout [7, 27] and early rheumatoid arthritis [28]. In clinical practice, it has demonstrated utility in a multidisciplinary rheumatology foot clinic in a prominent hospital-based service in the UK [29]. The aims of this study were to translate the MFPDI from English into simplified Chinese and to test its psychometric properties among people with IA-related foot pain in Singapore. The crosssectional correlational study aimed to translate the MFPDI from English into simplified Chinese (C-MFPDI) and to test its psychometric properties among people with inflammatory arthritis in Singapore
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