Lower extremity ulcers
Lower extremity ulcers are open skin breaks below the knee that fall into three clinically distinct patterns, venous stasis, arterial insufficiency, and diabetic neuropathic, distinguished chiefly by location, pain, and behavior with leg position, plus the pyoderma gangrenosum exception that must not be debrided. Management is cause-specific: compression and elevation for venous ulcers after confirming an ankle-brachial index above 0.9, revascularization and risk-factor control for arterial ulcers, and offloading with diabetes control for neuropathic ulcers.
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What this article covers
- Overview
Definition: a lower extremity ulcer is a break in the skin below the knee that fails to heal through normal reparative processes, most often driven by one of three underlying hemodynamic or neuropathic mechanisms.
- Epidemiology
Venous ulcers arise on a background of chronic venous insufficiency, a condition whose visible skin findings, an inverted champagne-bottle leg shape with hemosiderin staining and…
- Risk factors
Chronic venous insufficiency: older age, obesity, sedentary lifestyle, prior deep vein thrombosis, and prior leg trauma predispose to venous hypertension and subsequent venous ulceration.
- Pathophysiology
Venous ulcers result from venous hypertension, not extra fluid volume: incompetent venous valves and calf-muscle pump failure raise pressure in the superficial venous system, pushing red cells out of…
- Clinical features
Venous ulcer: mid-calf to ankle, often over the medial malleolus; irregularly shaped and shallow with weeping serous fluid; pain variably present, normal pulses; surrounding edema, varicosities…
- Differential diagnosis
Pyoderma gangrenosum: exquisitely painful with a violaceous, undermined, cribriform border, associated with inflammatory bowel disease, rheumatoid arthritis, or hematologic disease, unlike the…
- Diagnosis
The diagnostic basis is clinical, established by location, pain pattern, and behavior with leg position, supplemented by the ankle-brachial index as a mandatory safety gate before compression: a…
- Management
First, determine the ulcer type, since treatment is cause-specific and the wrong therapy causes harm (compression on an ischemic leg, debriding pyoderma gangrenosum).
- Complications
Nonhealing or progressive ulceration when the underlying mechanism (venous hypertension, arterial insufficiency, or unoffloaded pressure) is not corrected.
- Prognosis
Outcome tracks correction of the underlying mechanism: venous ulcers heal with sustained compression and elevation, arterial ulcers depend on revascularization, and neuropathic ulcers depend on consistent offloading and diabetes control.
- Prevention
Confirm an ankle-brachial index above 0.9 before starting compression therapy in any patient with chronic venous insufficiency, to avoid worsening an unrecognized arterial component.
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Related articles
- Pressure ulcers
Pressure ulcers (pressure injuries) are localized areas of skin and soft-tissue damage over a bony prominence, most often the sacrum, ischium, heel, or trochanter, caused by unrelieved pressure, friction, moisture, and shear in an immobilized patient. Management begins with immediate pressure redistribution and repositioning at least every 2 to 3 hours, paired with wound-bed debridement, moisture-balanced dressings, and culture-directed antibiotics reserved for spreading cellulitis, sepsis, abscess, or confirmed osteomyelitis rather than colonization.
- Pyoderma gangrenosum
Pyoderma gangrenosum is a rare neutrophilic ulcerative disease that begins as a tender pustule or nodule and rapidly evolves into a painful ulcer with a violaceous, undermined border, most often in patients with inflammatory bowel disease, inflammatory arthritis, or a hematologic disorder. Diagnosis is clinical and by exclusion after biopsy and culture; first-line treatment is systemic glucocorticoids or cyclosporine, and debridement must be avoided because of pathergy.