5.3 Lymphedema & Compression Therapy

Lymphedema Staging

Lymphedema reflects a failure of the lymphatic system to clear protein-rich interstitial fluid. The stages describe how the tissue itself has changed, not just the volume present. Distinguishing lymphedema from venous edema is a frequent test point, and the Stemmer sign is the quickest discriminator.

A positive Stemmer sign — the inability to pinch and lift a skin fold at the base of the second toe or finger — is a classic indicator of lymphedema rather than simple venous edema. Lymphedema is also commonly distinguished as primary (congenital or developmental lymphatic malformation, e.g., Milroy disease) versus secondary (acquired after surgery, radiation, lymph node dissection, infection, or trauma) — the post-mastectomy upper-extremity scenario is the most heavily tested example.

On the exam, watch for stems that contrast lymphedema with lipedema (symmetric, bilateral fatty deposition that characteristically spares the feet and is non-pitting, with a negative Stemmer sign) and with chronic venous insufficiency (which produces hemosiderin staining and medial gaiter ulcers rather than fibrotic skin folds).

The defining feature the exam rewards is the protein-rich nature of lymphatic fluid: because stagnant protein draws and holds water and feeds bacteria, untreated lymphedema both fibroses the tissue over time and dramatically raises the risk of recurrent cellulitis, which is why meticulous skin care is a non-negotiable pillar of management rather than an optional add-on.

Complete Decongestive Therapy (CDT)

Complete Decongestive Therapy (CDT) is the gold-standard conservative management plan. It has two phases and four components.

Phase 1 — Intensive (decongestive) phase. Daily or near-daily treatment for two to four weeks aiming for maximal volume reduction. Components:

• Manual Lymph Drainage (MLD) — gentle, slow skin-stretch strokes that redirect lymph toward functioning (intact) quadrants; performed light enough not to cause hyperemia.
• Short-stretch compression bandaging — multilayer, low-resting/high-working-pressure bandaging worn about 23 hours per day.
• Decongestive exercises — performed inside the bandages or garments to harness the muscle pump.
• Skin care — meticulous hygiene and moisturization to reduce cellulitis risk.

Phase 2 — Maintenance phase. Lifelong self-management with daytime compression garments, nighttime bandaging or specialty night garments, self-MLD, decongestive exercise, and skin care to preserve the reduced limb volume.

PTA Scope In Lymphedema

The initial evaluation, the MLD treatment plan, and decisions about bandaging pressures and garment specifications are performed by the supervising PT, often a CLT-LANA Certified Lymphedema Therapist. The PTA carries out MLD-style sequencing, applies bandages, fits patients into prescribed garments, takes limb-volume/circumference measurements, and reinforces home-program education within the written plan of care. Any change in skin integrity, suspected cellulitis (sudden warmth, redness, fever), or sudden volume change must be reported to the supervising PT before continuing.

Compression Bandaging Principles

Short-stretch bandages produce low resting pressure (comfortable while still) and high working pressure (firm when muscles contract against them). The PTA applies bandages with three rules in mind:

1. Distal to proximal — wrap from the fingers or toes toward the trunk so fluid is squeezed centrally.
2. More tension distally, less proximally — creates a pressure gradient that prevents backflow and tourniquet effects.
3. No wrinkles or gaps — wrinkles concentrate pressure and cause breakdown; uncovered gaps cause "window edema."

Absolute contraindications to compression include acute Deep Vein Thrombosis (DVT), untreated cellulitis or active infection, uncontrolled/decompensated congestive heart failure (compression can shift fluid centrally and overload the heart), and arterial insufficiency with an Ankle-Brachial Index (ABI) below 0.5. Caution applies when the ABI is 0.5 to 0.8, and modified lower pressures may be ordered.

Compression Garment Classes

Garment classes describe the pressure measured at the ankle (or wrist for upper-extremity sleeves). Higher classes serve more advanced lymphedema or severe venous disease, but higher is not automatically better — over-compression can worsen distal swelling and skin integrity.

Garments are replaced about every 3 to 6 months because elastic recoil degrades with washing and wear. The PTA reinforces the replacement schedule, confirms the patient can don/doff safely, and documents wear adherence and skin condition under the garment.

A few PTA-level execution traps round out this topic. First, direction matters more than force: a beautifully snug bandage applied proximal-to-distal still drives fluid the wrong way and worsens distal swelling, so the gradient always builds from the digits inward. Second, an intermittent pneumatic compression pump may be part of the plan, but it is layered onto — never substituted for — MLD and skin care, and pressures are set by the PT; the PTA should report new genital or truncal swelling, which can occur when fluid is pushed centrally without clearing the proximal pathways first.

Third, garment fit is dynamic: as the intensive phase reduces limb volume, a garment that fit at fitting may become loose within weeks, so re-measurement and timely refitting protect the gains. Finally, the PTA reinforces that elevation, exercise, and skin care continue for life; lymphedema is managed, not cured, and a single skipped maintenance cycle can allow rapid re-accumulation that takes far longer to reverse than to prevent.