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Canadian Family Physician logoLink to Canadian Family Physician
. 2001 May;47:1007–1016.

Diabetic foot ulcers. Pathophysiology, assessment, and therapy.

C K Bowering 1
PMCID: PMC2018500  PMID: 11398715

Abstract

OBJECTIVE: To review underlying causes of diabetic foot ulceration, provide a practical assessment of patients at risk, and outline an evidence-based approach to therapy for diabetic patients with foot ulcers. QUALITY OF EVIDENCE: A MEDLINE search was conducted for the period from 1979 to 1999 for articles relating to diabetic foot ulcers. Most studies found were case series or small controlled trials. MAIN MESSAGE: Foot ulcers in diabetic patients are common and frequently lead to lower limb amputation unless a prompt, rational, multidisciplinary approach to therapy is taken. Factors that affect development and healing of diabetic patients' foot ulcers include the degree of metabolic control, the presence of ischemia or infection, and continuing trauma to feet from excessive plantar pressure or poorly fitting shoes. Appropriate wound care for diabetic patients addresses these issues and provides optimal local ulcer therapy with débridement of necrotic tissue and provision of a moist wound-healing environment. Therapies that have no known therapeutic value, such as foot soaking and topical antiseptics, can actually be harmful and should be avoided. CONCLUSION: Family physicians are often primary medical contacts for patients with diabetes. Patients should be screened regularly for diabetic foot complications, and preventive measures should be initiated for those at risk of ulceration.

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Selected References

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  1. Adler A. I., Boyko E. J., Ahroni J. H., Stensel V., Forsberg R. C., Smith D. G. Risk factors for diabetic peripheral sensory neuropathy. Results of the Seattle Prospective Diabetic Foot Study. Diabetes Care. 1997 Jul;20(7):1162–1167. doi: 10.2337/diacare.20.7.1162. [DOI] [PubMed] [Google Scholar]
  2. Apelqvist J., Agardh C. D. The association between clinical risk factors and outcome of diabetic foot ulcers. Diabetes Res Clin Pract. 1992 Oct;18(1):43–53. doi: 10.1016/0168-8227(92)90054-u. [DOI] [PubMed] [Google Scholar]
  3. Apelqvist J., Castenfors J., Larsson J., Stenström A., Agardh C. D. Prognostic value of systolic ankle and toe blood pressure levels in outcome of diabetic foot ulcer. Diabetes Care. 1989 Jun;12(6):373–378. doi: 10.2337/diacare.12.6.373. [DOI] [PubMed] [Google Scholar]
  4. Bagdade J. D., Stewart M., Walters E. Impaired granulocyte adherence. A reversible defect in host defense in patients with poorly controlled diabetes. Diabetes. 1978 Jun;27(6):677–681. doi: 10.2337/diab.27.6.677. [DOI] [PubMed] [Google Scholar]
  5. Bailey T. S., Yu H. M., Rayfield E. J. Patterns of foot examination in a diabetes clinic. Am J Med. 1985 Mar;78(3):371–374. doi: 10.1016/0002-9343(85)90326-2. [DOI] [PubMed] [Google Scholar]
  6. Ballard J. L., Eke C. C., Bunt T. J., Killeen J. D. A prospective evaluation of transcutaneous oxygen measurements in the management of diabetic foot problems. J Vasc Surg. 1995 Oct;22(4):485–492. doi: 10.1016/s0741-5214(95)70018-8. [DOI] [PubMed] [Google Scholar]
  7. Borssén B., Bergenheim T., Lithner F. The epidemiology of foot lesions in diabetic patients aged 15-50 years. Diabet Med. 1990 Jun;7(5):438–444. doi: 10.1111/j.1464-5491.1990.tb01420.x. [DOI] [PubMed] [Google Scholar]
  8. Cameron N. E., Cotter M. A. Metabolic and vascular factors in the pathogenesis of diabetic neuropathy. Diabetes. 1997 Sep;46 (Suppl 2):S31–S37. doi: 10.2337/diab.46.2.s31. [DOI] [PubMed] [Google Scholar]
  9. Chantelau E., Haage P. An audit of cushioned diabetic footwear: relation to patient compliance. Diabet Med. 1994 Jan-Feb;11(1):114–116. doi: 10.1111/j.1464-5491.1994.tb00240.x. [DOI] [PubMed] [Google Scholar]
  10. Cook T. A., Rahim N., Simpson H. C., Galland R. B. Magnetic resonance imaging in the management of diabetic foot infection. Br J Surg. 1996 Feb;83(2):245–248. [PubMed] [Google Scholar]
  11. Doxey D. L., Ng M. C., Dill R. E., Iacopino A. M. Platelet-derived growth factor levels in wounds of diabetic rats. Life Sci. 1995;57(11):1111–1123. doi: 10.1016/0024-3205(95)02056-o. [DOI] [PubMed] [Google Scholar]
  12. Dyck P. J., Davies J. L., Wilson D. M., Service F. J., Melton L. J., 3rd, O'Brien P. C. Risk factors for severity of diabetic polyneuropathy: intensive longitudinal assessment of the Rochester Diabetic Neuropathy Study cohort. Diabetes Care. 1999 Sep;22(9):1479–1486. doi: 10.2337/diacare.22.9.1479. [DOI] [PubMed] [Google Scholar]
  13. Edmonds M. E., Blundell M. P., Morris M. E., Thomas E. M., Cotton L. T., Watkins P. J. Improved survival of the diabetic foot: the role of a specialized foot clinic. Q J Med. 1986 Aug;60(232):763–771. [PubMed] [Google Scholar]
  14. Eneroth M., Apelqvist J., Stenström A. Clinical characteristics and outcome in 223 diabetic patients with deep foot infections. Foot Ankle Int. 1997 Nov;18(11):716–722. doi: 10.1177/107110079701801107. [DOI] [PubMed] [Google Scholar]
  15. Faglia E., Favales F., Aldeghi A., Calia P., Quarantiello A., Oriani G., Michael M., Campagnoli P., Morabito A. Adjunctive systemic hyperbaric oxygen therapy in treatment of severe prevalently ischemic diabetic foot ulcer. A randomized study. Diabetes Care. 1996 Dec;19(12):1338–1343. doi: 10.2337/diacare.19.12.1338. [DOI] [PubMed] [Google Scholar]
  16. Flores Rivera A. R. Risk factors for amputation in diabetic patients: a case-control study. Arch Med Res. 1998 Summer;29(2):179–184. [PubMed] [Google Scholar]
  17. Goss D. E., Stevens M., Watkins P. J., Baskerville P. A. Falsely raised ankle/brachial pressure index: a method to determine tibial artery compressibility. Eur J Vasc Surg. 1991 Feb;5(1):23–26. doi: 10.1016/s0950-821x(05)80922-3. [DOI] [PubMed] [Google Scholar]
  18. Gottrup F., Andreassen T. T. Healing of incisional wounds in stomach and duodenum: the influence of experimental diabetes. J Surg Res. 1981 Jul;31(1):61–68. doi: 10.1016/0022-4804(81)90030-5. [DOI] [PubMed] [Google Scholar]
  19. Grayson M. L., Gibbons G. W., Balogh K., Levin E., Karchmer A. W. Probing to bone in infected pedal ulcers. A clinical sign of underlying osteomyelitis in diabetic patients. JAMA. 1995 Mar 1;273(9):721–723. [PubMed] [Google Scholar]
  20. Grunfeld C. Diabetic foot ulcers: etiology, treatment, and prevention. Adv Intern Med. 1992;37:103–132. [PubMed] [Google Scholar]
  21. Harris M., Eastman R., Cowie C. Symptoms of sensory neuropathy in adults with NIDDM in the U.S. population. Diabetes Care. 1993 Nov;16(11):1446–1452. doi: 10.2337/diacare.16.11.1446. [DOI] [PubMed] [Google Scholar]
  22. Jackson M. R., Clagett G. P. Antithrombotic therapy in peripheral arterial occlusive disease. Chest. 1998 Nov;114(5 Suppl):666S–682S. doi: 10.1378/chest.114.5_supplement.666s. [DOI] [PubMed] [Google Scholar]
  23. Johnson J. E., Kennedy E. J., Shereff M. J., Patel N. C., Collier B. D. Prospective study of bone, indium-111-labeled white blood cell, and gallium-67 scanning for the evaluation of osteomyelitis in the diabetic foot. Foot Ankle Int. 1996 Jan;17(1):10–16. doi: 10.1177/107110079601700103. [DOI] [PubMed] [Google Scholar]
  24. Katz M. A., McCuskey P., Beggs J. L., Johnson P. C., Gaines J. A. Relationships between microvascular function and capillary structure in diabetic and nondiabetic human skin. Diabetes. 1989 Oct;38(10):1245–1250. doi: 10.2337/diab.38.10.1245. [DOI] [PubMed] [Google Scholar]
  25. Krupski W. C. The peripheral vascular consequences of smoking. Ann Vasc Surg. 1991 May;5(3):291–304. doi: 10.1007/BF02329389. [DOI] [PubMed] [Google Scholar]
  26. Larsson J., Apelqvist J., Agardh C. D., Stenström A. Decreasing incidence of major amputation in diabetic patients: a consequence of a multidisciplinary foot care team approach? Diabet Med. 1995 Sep;12(9):770–776. doi: 10.1111/j.1464-5491.1995.tb02078.x. [DOI] [PubMed] [Google Scholar]
  27. Lavery L. A., Vela S. A., Lavery D. C., Quebedeaux T. L. Reducing dynamic foot pressures in high-risk diabetic subjects with foot ulcerations. A comparison of treatments. Diabetes Care. 1996 Aug;19(8):818–821. doi: 10.2337/diacare.19.8.818. [DOI] [PubMed] [Google Scholar]
  28. Lineaweaver W., Howard R., Soucy D., McMorris S., Freeman J., Crain C., Robertson J., Rumley T. Topical antimicrobial toxicity. Arch Surg. 1985 Mar;120(3):267–270. doi: 10.1001/archsurg.1985.01390270007001. [DOI] [PubMed] [Google Scholar]
  29. Litzelman D. K., Slemenda C. W., Langefeld C. D., Hays L. M., Welch M. A., Bild D. E., Ford E. S., Vinicor F. Reduction of lower extremity clinical abnormalities in patients with non-insulin-dependent diabetes mellitus. A randomized, controlled trial. Ann Intern Med. 1993 Jul 1;119(1):36–41. doi: 10.7326/0003-4819-119-1-199307010-00006. [DOI] [PubMed] [Google Scholar]
  30. LoGerfo F. W., Coffman J. D. Current concepts. Vascular and microvascular disease of the foot in diabetes. Implications for foot care. N Engl J Med. 1984 Dec 20;311(25):1615–1619. doi: 10.1056/NEJM198412203112506. [DOI] [PubMed] [Google Scholar]
  31. Loots M. A., Lamme E. N., Mekkes J. R., Bos J. D., Middelkoop E. Cultured fibroblasts from chronic diabetic wounds on the lower extremity (non-insulin-dependent diabetes mellitus) show disturbed proliferation. Arch Dermatol Res. 1999 Feb-Mar;291(2-3):93–99. doi: 10.1007/s004030050389. [DOI] [PubMed] [Google Scholar]
  32. Louie T. J., Bartlett J. G., Tally F. P., Gorbach S. L. Aerobic and anaerobic bacteria in diabetic foot ulcers. Ann Intern Med. 1976 Oct;85(4):461–463. doi: 10.7326/0003-4819-85-4-461. [DOI] [PubMed] [Google Scholar]
  33. Mantey I., Foster A. V., Spencer S., Edmonds M. E. Why do foot ulcers recur in diabetic patients? Diabet Med. 1999 Mar;16(3):245–249. doi: 10.1046/j.1464-5491.1999.00032.x. [DOI] [PubMed] [Google Scholar]
  34. Mayfield J. A., Reiber G. E., Sanders L. J., Janisse D., Pogach L. M. Preventive foot care in people with diabetes. Diabetes Care. 1998 Dec;21(12):2161–2177. doi: 10.2337/diacare.21.12.2161. [DOI] [PubMed] [Google Scholar]
  35. Mayfield J. A., Rith-Najarian S. J., Acton K. J., Schraer C. D., Stahn R. M., Johnson M. H., Gohdes D. Assessment of diabetes care by medical record review. The Indian Health Service model. Diabetes Care. 1994 Aug;17(8):918–923. doi: 10.2337/diacare.17.8.918. [DOI] [PubMed] [Google Scholar]
  36. McGill M., Molyneaux L., Spencer R., Heng L. F., Yue D. K. Possible sources of discrepancies in the use of the Semmes-Weinstein monofilament. Impact on prevalence of insensate foot and workload requirements. Diabetes Care. 1999 Apr;22(4):598–602. doi: 10.2337/diacare.22.4.598. [DOI] [PubMed] [Google Scholar]
  37. McMillan D. E. Blood flow and the localization of atherosclerotic plaques. Stroke. 1985 Jul-Aug;16(4):582–587. doi: 10.1161/01.str.16.4.582. [DOI] [PubMed] [Google Scholar]
  38. Meltzer S., Leiter L., Daneman D., Gerstein H. C., Lau D., Ludwig S., Yale J. F., Zinman B., Lillie D. 1998 clinical practice guidelines for the management of diabetes in Canada. Canadian Diabetes Association. CMAJ. 1998;159 (Suppl 8):S1–29. [PMC free article] [PubMed] [Google Scholar]
  39. Morrison W. B., Schweitzer M. E., Wapner K. L., Hecht P. J., Gannon F. H., Behm W. R. Osteomyelitis in feet of diabetics: clinical accuracy, surgical utility, and cost-effectiveness of MR imaging. Radiology. 1995 Aug;196(2):557–564. doi: 10.1148/radiology.196.2.7617877. [DOI] [PubMed] [Google Scholar]
  40. Moss S. E., Klein R., Klein B. E. The prevalence and incidence of lower extremity amputation in a diabetic population. Arch Intern Med. 1992 Mar;152(3):610–616. [PubMed] [Google Scholar]
  41. Mueller M. J. Identifying patients with diabetes mellitus who are at risk for lower-extremity complications: use of Semmes-Weinstein monofilaments. Phys Ther. 1996 Jan;76(1):68–71. doi: 10.1093/ptj/76.1.68. [DOI] [PubMed] [Google Scholar]
  42. Myerson M., Papa J., Eaton K., Wilson K. The total-contact cast for management of neuropathic plantar ulceration of the foot. J Bone Joint Surg Am. 1992 Feb;74(2):261–269. [PubMed] [Google Scholar]
  43. Mühlhauser I. Cigarette smoking and diabetes: an update. Diabet Med. 1994 May;11(4):336–343. doi: 10.1111/j.1464-5491.1994.tb00283.x. [DOI] [PubMed] [Google Scholar]
  44. Newman L. G. Imaging techniques in the diabetic foot. Clin Podiatr Med Surg. 1995 Jan;12(1):75–86. [PubMed] [Google Scholar]
  45. Newman L. G., Waller J., Palestro C. J., Schwartz M., Klein M. J., Hermann G., Harrington E., Harrington M., Roman S. H., Stagnaro-Green A. Unsuspected osteomyelitis in diabetic foot ulcers. Diagnosis and monitoring by leukocyte scanning with indium in 111 oxyquinoline. JAMA. 1991 Sep 4;266(9):1246–1251. doi: 10.1001/jama.266.9.1246. [DOI] [PubMed] [Google Scholar]
  46. Payne T. H., Gabella B. A., Michael S. L., Young W. F., Pickard J., Hofeldt F. D., Fan F., Stromberg J. S., Hamman R. F. Preventive care in diabetes mellitus. Current practice in urban health-care system. Diabetes Care. 1989 Nov-Dec;12(10):745–747. doi: 10.2337/diacare.12.10.745. [DOI] [PubMed] [Google Scholar]
  47. Pecoraro R. E., Reiber G. E., Burgess E. M. Pathways to diabetic limb amputation. Basis for prevention. Diabetes Care. 1990 May;13(5):513–521. doi: 10.2337/diacare.13.5.513. [DOI] [PubMed] [Google Scholar]
  48. Pohjolainen T., Alaranta H. Epidemiology of lower limb amputees in Southern Finland in 1995 and trends since 1984. Prosthet Orthot Int. 1999 Aug;23(2):88–92. doi: 10.3109/03093649909071618. [DOI] [PubMed] [Google Scholar]
  49. Rayman G., Hassan A., Tooke J. E. Blood flow in the skin of the foot related to posture in diabetes mellitus. Br Med J (Clin Res Ed) 1986 Jan 11;292(6513):87–90. doi: 10.1136/bmj.292.6513.87. [DOI] [PMC free article] [PubMed] [Google Scholar]
  50. Reiber G. E., Vileikyte L., Boyko E. J., del Aguila M., Smith D. G., Lavery L. A., Boulton A. J. Causal pathways for incident lower-extremity ulcers in patients with diabetes from two settings. Diabetes Care. 1999 Jan;22(1):157–162. doi: 10.2337/diacare.22.1.157. [DOI] [PubMed] [Google Scholar]
  51. Rith-Najarian S. J., Stolusky T., Gohdes D. M. Identifying diabetic patients at high risk for lower-extremity amputation in a primary health care setting. A prospective evaluation of simple screening criteria. Diabetes Care. 1992 Oct;15(10):1386–1389. doi: 10.2337/diacare.15.10.1386. [DOI] [PubMed] [Google Scholar]
  52. Rivers S. P., Scher L., Veith F. J. Indications for distal arterial reconstruction in the presence of palpable pedal pulses. J Vasc Surg. 1990 Nov;12(5):552–557. [PubMed] [Google Scholar]
  53. Sapico F. L., Witte J. L., Canawati H. N., Montgomerie J. Z., Bessman A. N. The infected foot of the diabetic patient: quantitative microbiology and analysis of clinical features. Rev Infect Dis. 1984 Mar-Apr;6 (Suppl 1):S171–S176. doi: 10.1093/clinids/6.supplement_1.s171. [DOI] [PubMed] [Google Scholar]
  54. Tan M. H., MacLean D. R. Epidemiology of diabetes mellitus in Canada. Clin Invest Med. 1995 Aug;18(4):240–246. [PubMed] [Google Scholar]
  55. Uccioli L., Faglia E., Monticone G., Favales F., Durola L., Aldeghi A., Quarantiello A., Calia P., Menzinger G. Manufactured shoes in the prevention of diabetic foot ulcers. Diabetes Care. 1995 Oct;18(10):1376–1378. doi: 10.2337/diacare.18.10.1376. [DOI] [PubMed] [Google Scholar]
  56. Verhelst R., Bruneau M., Nicolas A. L., Frangi R., El Khoury G., Noirhomme P., Dion R. Popliteal-to-distal bypass grafts for limb salvage. Ann Vasc Surg. 1997 Sep;11(5):505–509. doi: 10.1007/s100169900082. [DOI] [PubMed] [Google Scholar]
  57. Walmsley D., Wiles P. G. Early loss of neurogenic inflammation in the human diabetic foot. Clin Sci (Lond) 1991 Jun;80(6):605–610. doi: 10.1042/cs0800605. [DOI] [PubMed] [Google Scholar]
  58. Walters D. P., Gatling W., Mullee M. A., Hill R. D. The distribution and severity of diabetic foot disease: a community study with comparison to a non-diabetic group. Diabet Med. 1992 May;9(4):354–358. doi: 10.1111/j.1464-5491.1992.tb01796.x. [DOI] [PubMed] [Google Scholar]
  59. Wieman T. J., Smiell J. M., Su Y. Efficacy and safety of a topical gel formulation of recombinant human platelet-derived growth factor-BB (becaplermin) in patients with chronic neuropathic diabetic ulcers. A phase III randomized placebo-controlled double-blind study. Diabetes Care. 1998 May;21(5):822–827. doi: 10.2337/diacare.21.5.822. [DOI] [PubMed] [Google Scholar]
  60. Wright J. B., Lam K., Burrell R. E. Wound management in an era of increasing bacterial antibiotic resistance: a role for topical silver treatment. Am J Infect Control. 1998 Dec;26(6):572–577. doi: 10.1053/ic.1998.v26.a93527. [DOI] [PubMed] [Google Scholar]
  61. Younger D. S., Rosoklija G., Hays A. P. Diabetic peripheral neuropathy. Semin Neurol. 1998;18(1):95–104. doi: 10.1055/s-2008-1040865. [DOI] [PubMed] [Google Scholar]
  62. Zamboni W. A., Wong H. P., Stephenson L. L., Pfeifer M. A. Evaluation of hyperbaric oxygen for diabetic wounds: a prospective study. Undersea Hyperb Med. 1997 Sep;24(3):175–179. [PubMed] [Google Scholar]

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