Article

OBJECTIVE: To determine whether the revised High-Level Mobility Assessment Tool
(HiMAT) was valid for measuring mobility for people with multi-trauma orthopaedic
lower limb injuries. DESIGN: Cross-sectional study.
SUBJECTS: Participants with
lower limb multi-trauma orthopaedic injuries. METHODS: One complete revised HiMAT
was obtained for 106 people within 12 weeks of being allowed to fully weight
bear. Rasch analysis was used to assess the overall fit of the model for
individuals and items, differential item functioning, local dependency, targeting
of items and dimensionality. RESULTS: The mean revised HiMAT score was 10.5 (SD =
6.8) with a range of 5-30. Rasch analysis of revised HiMAT showed adequate
overall fit to the model (P = 0.29) with no misfitting items (fit residual SD =
0.69) or persons (fit residual SD = 0.62). The scale showed good internal
consistency (Person Separation Index = 0.91). One item (hopping) demonstrated
disordered thresholds, however this item had good fit to the model in all other
aspects. The revised HiMAT was unidimensional, and no differential item
functioning was detected for gender or age. The revised HiMAT was well targeted
for this group with a range of items across all ability levels. CONCLUSION: The
results of this study support the internal construct validity of the revised
HiMAT as a well-targeted, unidimensional measure of high-level mobility with no
ceiling or floor effect for males and females recovering from multi-trauma
orthopaedic lower limb injuries.

Langue : ANGLAIS