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Diabetes Care, Vol 22, Issue 1 157-162, Copyright © 1999 by American Diabetes Association
Causal pathways for incident lower-extremity ulcers in patients with diabetes from two settings
GE Reiber, L Vileikyte, EJ Boyko, M del Aguila, DG Smith, LA Lavery and AJ Boulton
Department of Health Services, University of Washington, Seattle, USA. greiber@u.washington.edu
OBJECTIVE: To determine the frequency and constellations of anatomic,
pathophysiologic, and environmental factors involved in the development of
incident diabetic foot ulcers in patients with diabetes and no history of
foot ulcers from Manchester, U.K., and Seattle, Washington, research
settings. RESEARCH DESIGN AND METHODS: The Rothman model of causation was
applied to the diabetic foot ulcer condition. The presence of structural
deformities, peripheral neuropathy, ischemia, infection, edema, and callus
formation was determined for diabetic individuals with incident foot ulcers
in Manchester and Seattle. Demographic, health, diabetes, and ulcer data
were ascertained for each patient. A multidisciplinary group of foot
specialists blinded to patient identity independently reviewed detailed
abstracts to determine component and sufficient causes present and
contributing to the development of each patient's foot ulcer. A modified
Delphi process assisted the group in reaching consensus on component causes
for each patient. Estimates of the proportion of ulcers that could be
ascribed to each component cause were computed. RESULTS: From among 92
study patients from Manchester and 56 from Seattle, 32 unique causal
pathways were identified. A critical triad (neuropathy, minor foot trauma,
foot deformity) was present in > 63% of patient's causal pathways to
foot ulcers. The components edema and ischemia contributed to the
development of 37 and 35% of foot ulcers, respectively. Callus formation
was associated with ulcer development in 30% of the pathways. Two unitary
causes of ulcer were identified, with trauma and edema accounting for 6 and
< 1% of ulcers, respectively. The majority of the lesions were on the
plantar toes, forefoot, and midfoot. CONCLUSIONS: The most frequent
component causes for lower-extremity ulcers were trauma, neuropathy, and
deformity, which were present in a majority of patients. Clinicians are
encouraged to use proven strategies to prevent and decrease the impact of
modifiable conditions leading to foot ulcers in patients with diabetes.

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J Am Podiatr Med Assoc,
January 1, 2002;
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R. G. Frykberg, L. F. Bailey, A. Matz, L. A. Panthel, and G. Ruesch
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F. Abouaesha, C. H.M. van Schie, G. D. Griffths, R. J. Young, and A. J.M. Boulton
Plantar Tissue Thickness Is Related to Peak Plantar Pressure in the High-Risk Diabetic Foot
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24(7):
1270 - 1274.
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R. A. Sage, J. K. Webster, and S. G. Fisher
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J Am Podiatr Med Assoc,
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275 - 279.
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A. J. M. Boulton and E. B. Jude
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Copyright © 1999 by the American Diabetes Association.
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