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Reproducibility and validity of the Dutch translation of the de Morton Mobility Index (DEMMI) used by physiotherapists in older patients with knee or Hip osteoarthritis

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Author: Jans, M.P. · Slootweg, V.C. · Boot, C.R. · Morton, N.A. de · Sluis, G. van der · Meeteren, N.L. van
Source:Archives of Physical Medicine and Rehabilitation, 11, 92, 1892-1899
Identifier: 442980
doi: doi:10.1016/j.apmr.2011.05.011
Keywords: Health · Activities of daily living · Aged · Geriatric assessment · Mobility limitation · Rehabilitation · Reproducibility of results · aged · article · clinical article · clinical practice · construct validity · cross-sectional study · de Morton mobility index · female · hip osteoarthritis · human · interrater reliability · knee osteoarthritis · male · orthopedic surgery · patient mobility · performance · physiotherapist · rating scale · reproducibility · self report · total hip prosthesis · total knee replacement · Healthy Living · HL - Healthy for Life · Themalijn


Objective: To examine the reproducibility, construct validity, and unidimensionality of the Dutch translation of the de Morton Mobility Index (DEMMI), a performance-based measure of mobility for older patients. Design: Cross-sectional study. Setting: Rehabilitation center (reproducibility study) and hospital (validity study). Participants: Patients (N=28; age >65y) after orthopedic surgery (reproducibility study) and patients (N=219; age >65y) waiting for total hip or total knee arthroplasty (validity study). Intervention: Not applicable. Main Outcome Measures: Not applicable. Results: The intraclass correlation coefficient for interrater reliability was high (.85; 95% confidence interval, 71.93), and minimal detectable change with 90% confidence was 7 on the 100-point DEMMI scale. Rasch analysis identified that the Dutch translation of the DEMMI is a unidimensional measure of mobility in this population. DEMMI scores showed high correlations with scores on other performance-based measures of mobility (Timed Up and Go test, Spearman r=-.73; Chair Rise Time, r=-.69; walking test, r=.74). A lower correlation of.44 was identified with the self-report measure Western Ontario and McMaster Universities Osteoarthritis Index. Conclusions: The Dutch translation of the DEMMI is a reproducible and valid performance-based measure for assessing mobility in older patients with knee or hip osteoarthritis. © 2011 American Congress of Rehabilitation Medicine.