Compression Therapy for Venous Leg Ulcers: What Every Clinician Should Know
Compression therapy for VLUs — ABI screening requirements, multi-layer vs short-stretch systems, patient compliance strategies, and when compression is contraindicated.
Damon Ebanks
Medipyxis
Why Is Compression the Cornerstone of VLU Treatment?
Venous leg ulcers (VLUs) account for roughly 70% of all lower-extremity ulcers, and the underlying pathology is venous hypertension -- sustained elevated pressure in the lower leg veins caused by incompetent valves, obstruction, or impaired calf muscle pump function. Without addressing that pressure, topical wound care alone will not close the wound.
Compression therapy is the single most evidence-supported intervention for VLUs. Meta-analyses consistently show that VLUs treated with adequate compression heal significantly faster than those treated with dressings alone. Compression reduces venous hypertension, decreases edema, improves venous return, and creates a wound environment where granulation and epithelialization can progress. No dressing, skin substitute, or advanced therapy replaces the need for compression in a venous ulcer.
What ABI screening is required before applying compression?
An ankle-brachial index (ABI) measurement is mandatory before initiating compression. ABI identifies concurrent peripheral arterial disease (PAD), which changes the compression plan entirely.
ABI >0.8: Full therapeutic compression (30-40 mmHg) is safe and indicated.
ABI 0.5-0.8: Modified (reduced) compression may be used under close clinical supervision. Short-stretch systems or lower-pressure wraps are preferred over full four-layer bandaging. Vascular referral should be considered.
ABI <0.5: Compression is contraindicated. Arterial insufficiency is severe enough that external compression risks limb ischemia. These patients require vascular evaluation before any compression is applied.
ABIs should be repeated if the patient's vascular status changes or if symptoms of arterial compromise develop during treatment. For documentation requirements tied to ABI screening, see our CPT code guide for wound care.
What compression system options are available?
Four-layer bandage systems. The most studied option for VLUs. Four layers (orthopedic wool, crepe, elastic, cohesive) deliver sustained 40 mmHg at the ankle that graduates down to approximately 17 mmHg at the knee. Changed weekly. Gold standard for healing rates.
Two-layer cohesive systems. Simplified application, easier for clinicians with less compression bandaging experience. Deliver therapeutic compression with fewer layers and shorter application time. Comparable efficacy to four-layer systems in recent trials.
Short-stretch bandages. Deliver high working pressure during ambulation but low resting pressure. Better tolerated by patients with mixed arterial-venous disease (ABI 0.5-0.8). Require more frequent reapplication as they loosen with wear.
Unna boot (zinc oxide impregnated gauze). Semi-rigid compression that provides consistent pressure. Cost-effective and well-suited for mobile wound care where weekly visit intervals are standard. Does not accommodate significant edema fluctuation.
How do I address patient compliance challenges?
Compression therapy only works if the patient wears it. Non-compliance is the most common reason VLUs fail to heal, and the most common reason patients remove compression is discomfort.
Start with edema reduction. If the limb is significantly edematous at the first visit, elevation and a short-stretch bandage for the first one to two weeks brings the limb closer to a manageable circumference before applying a full four-layer system.
Educate on the "worse before better" window. Patients report increased discomfort in the first 48-72 hours as edema redistributes. If they understand this is expected and temporary, they are more likely to keep the bandage on through the adaptation period.
Address footwear. Bulky compression bandaging may not fit in the patient's regular shoes. Discuss accommodative footwear options at the first application visit, not after they have already removed the bandage to get their shoe on.
When is compression contraindicated?
Compression must not be applied in the following situations:
- ABI <0.5 -- severe peripheral arterial disease with ischemia risk
- Acute deep vein thrombosis (DVT) -- compression over an acute clot risks embolization
- Decompensated congestive heart failure -- fluid redistribution from compression can worsen cardiac overload
- Active cellulitis with systemic signs -- treat the infection first, then compress
After the VLU heals, lifelong maintenance compression (20-30 mmHg graduated stockings) is required to prevent recurrence. Recurrence rates without maintenance compression exceed 70% within one year. The wound may close, but the venous insufficiency does not resolve -- compression is a permanent part of the patient's care plan.
For billing guidance on wound care encounters involving compression, see our CPT codes guide. For related lower-extremity wound management, see our diabetic foot ulcer guide.