5.5 Offloading, Compression, and Lymphedema Decision-Making

Cause control with pressure and edema

The Treatment domain (25%) includes support surfaces, adjuncts, product recommendations, and referrals, and offloading and compression are the heart of cause control. A dressing manages moisture; it cannot heal a plantar ulcer walked on all day or a venous ulcer with uncontrolled edema.

Offloading reduces harmful pressure and shear at the wound or at-risk site. For a plantar neuropathic diabetic foot ulcer without infection or significant ischemia, total contact casting (TCC) is the gold standard and the most effective device; removable cast walkers, instant TCC, healing sandals, felted foam, and custom footwear are alternatives, often used when adherence with a nonremovable cast is a concern. The exam focus is whether pressure is actually reduced and the patient can use the device safely.

Compression applies external pressure to control venous hypertension or lymphedema when arterial flow is adequate. Options include multilayer systems, short-stretch bandages, compression stockings, Unna boot, and intermittent pneumatic compression. The therapeutic target for an active venous ulcer is roughly 30 to 40 mmHg at the ankle, graduated and decreasing up the leg. Compression is powerful, so arterial status decides the dose.

Arterial sufficiency gates compression

Cause-control map

Applied WCC scenario

A neuropathic patient has a plantar metatarsal ulcer and says it does not hurt, so walking is fine. The best answer: explain that neuropathy hides pressure injury, arrange offloading (TCC unless infection/ischemia precludes it), assess footwear, screen for infection and perfusion, and document adherence barriers. Absence of pain is not evidence of low risk.

Compression stems hide ischemic clues: cool foot, rest pain, dependent rubor, black toes, absent pulses, or ABI under 0.5 should trigger vascular referral, not high compression. If arterial status is adequate and venous edema drives the wound, compression plus elevation, calf-pump activity, skin protection, and education are correct.

Lymphedema and exam traps

Lymphedema questions test the long view: nonpitting swelling, skin thickening (peau d'orange), lymphorrhea, recurrent cellulitis, and garment-fitting trouble call for complete decongestive therapy, skin hygiene, and referral to a certified lymphedema therapist. Traps: optimizing a dressing for a plantar ulcer while ignoring pressure; compressing any lower-leg wound without checking arterial flow; and letting a neuropathic patient self-adjust an offloading device without follow-up, since the device itself can cause pressure. Document the cause-intervention link, device fit, skin checks, tolerance, and follow-up.

Why total contact casting wins, and when it cannot be used

Total contact casting heals plantar neuropathic ulcers faster than other devices because it distributes load across the entire plantar surface and lower leg and, being nonremovable, it enforces adherence so the patient cannot skip offloading. That same nonremovable design is its limitation: it is contraindicated when there is active infection, abscess, significant ischemia (which is why an ABI check precedes casting), heavy drainage that cannot be inspected, or a patient who cannot tolerate or safely walk in the cast.

In those cases a removable cast walker (optionally rendered "instant TCC" by wrapping it so it is not removable), healing sandal, or custom footwear with felted-foam padding is selected. The exam point is that the choice is driven by infection, perfusion, drainage, and adherence, not patient preference alone.

Venous physiology and the compression target

Venous leg ulcers arise from ambulatory venous hypertension when incompetent valves and a weak calf-muscle pump let blood pool, raising capillary pressure and causing edema, hemosiderin staining, lipodermatosclerosis, and breakdown, classically in the gaiter area above the medial malleolus. Sustained graded compression of roughly 30 to 40 mmHg at the ankle reverses the hypertension and is the cornerstone of healing and recurrence prevention, which is why lifelong stockings are recommended after the ulcer closes.

Multilayer elastic systems maintain pressure at rest and with activity, while short-stretch bandages give high working pressure during ambulation and lower resting pressure, a useful distinction for less mobile patients. Elevation above heart level and calf-pump exercises augment any compression regimen.

Lymphedema: complete decongestive therapy

Lymphedema is failure of lymph transport, producing protein-rich nonpitting swelling, skin thickening with peau d'orange, deep skin folds, lymphorrhea, and a high cellulitis risk. The standard of care is complete decongestive therapy: manual lymphatic drainage, multilayer short-stretch bandaging in the intensive phase transitioning to compression garments for maintenance, meticulous skin and nail hygiene, and exercise, ideally coordinated by a certified lymphedema therapist. Arterial status is still confirmed first, and any new warmth, erythema, fever, or pain prompts evaluation for cellulitis.

The plan is documented and reevaluated on a defined schedule so progress is measurable.