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Development of grading scales of pedal sensory loss using Mokken scale analysis on the Rotterdam Diabetic Foot Study
Willem D Rinkel1,2,3, M Hosein Aziz1, Johan W Van Neck1
1Department of Plastic, Reconstructive, and Hand Surgery, Erasmus University Medical Center, Rotterdam, The Netherlands.
Introduction:
Loss of sensation due to diabetes-related neuropathy often leads to diabetic foot ulceration. Several test instruments are used to assess sensation, such as static and moving 2-point discrimination (S2PD, M2PD), monofilaments, and tuning forks.
Methods:
Mokken scale analysis was applied to the Rotterdam Diabetic Foot Study data to select hierarchies of tests to construct measurement scales.
Results:
We developed 39-item and 31-item scales to measure loss of sensation for research purposes and a 13-item scale for clinical practice. All instruments were strongly scalable and reliable. The 39 items can be classified into 5 hierarchically ordered core clusters: S2PD, M2PD, vibration sense, monofilaments, and prior ulcer or amputation.
Discussion:
Guided by the presented scales, clinicians may better classify the grade of sensory loss in diabetic patients' feet. Thus, a more personalized approach concerning individual recommendations, intervention strategies, and patient information may be applied.
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