Original articleReproducibility and Validity of the Dutch Translation of the de Morton Mobility Index (DEMMI) Used by Physiotherapists in Older Patients With Knee or Hip Osteoarthritis
Section snippets
Translation
We used the forward-backward translation method recommended by Guillemin et al.12 Two qualified translators independently translated the DEMMI into Dutch. Two other translators independently back-translated each translation into English. All translators were highly educated, translated the DEMMI into their mother tongue, and had no specific knowledge of osteoarthritis. Because physiotherapists are the users of the DEMMI, the Dutch translation subsequently was submitted to 3 physiotherapists
Translation
The 2 forward-backward translations yielded no differences in the description of DEMMI items (see Appendix 1). Some instructions in the protocol for administration of the DEMMI have been described in more detail after consulting the test developer (N.A.d.M.).
Reproducibility
The 2 physiotherapists assessed 28 patients (26 women; mean ± SD age, 73±8y). Fourteen patients underwent total hip replacement, 7 underwent total knee replacement, and 7 underwent other orthopedic surgeries. Nine patients used a walking
Discussion
This was the first study of the reproducibility and validity of the Dutch translation of the DEMMI used by physiotherapists and performed in a population of older people with knee or hip osteoarthritis.
Interrater reliability between 2 physiotherapists was good. There were no systematic differences between the 2 raters. The MDC90 indicated that a patient needs to improve or deteriorate by 7 or more points for a physiotherapist to be 90% confident that a true change in patient condition has
Conclusions
This study provides evidence that the Dutch translation of the DEMMI is a unidimensional, reproducible, valid, and feasible measure of mobility for use by physiotherapists in older patients with knee or hip osteoarthritis. The simplicity and utility of the DEMMI make this instrument easy to fit into usual clinical care.
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2016, Archives of Physical Medicine and RehabilitationCitation Excerpt :Rasch analysis has been used to construct an interval level scoring system out of 100 from the 15 ordinal items.24 The DEMMI has been widely used and validated in mixed populations (including LL arthroplasty) across the full mobility spectrum and clinical settings (acute, subacute, community), in which this patient population is commonly seen.9,10,12-15,25 This study was performed and reported in accordance with Guidelines for Reporting Reliability and Agreement Studies.26
Validation of the de Morton mobility index (DEMMI) among acute stroke patients aged ≥65 years: a register study
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Supported by a National Health and Medical Research Council of Australia (NHMRC) Post Doctoral Fellowship (ID 519555).
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.