How to Apply Unna-Z Zinc Oxide Bandages for Leg Ulcers

By Medical Supply Pros | Published: 2026-11-05

Category: 操作指南

Step-by-step Unna-Z zinc oxide bandage application for venous leg ulcers: 50% overlap, light even tension, toe-to-knee wrapping, and mistakes to avoid.

Quick answer

Apply an Unna-Z bandage from the base of the toes to just below the knee with a 50% overlap and light, even tension, then secure it and check circulation. The wrap should feel firm but never cause numbness, tingling, or color change.

Why Unna-Z is a semi-rigid wrap, not a simple elastic bandage

Unna-Z Zinc Oxide Compression Bandages combine a zinc oxide paste with a semi-rigid fabric. The paste helps maintain a moist healing environment for minor wounds, while the fabric provides mild, consistent compression to reduce swelling and support circulation. That combination means the wrap must be applied smoothly and left undisturbed between changes, so technique matters more than speed.

Because the bandage is semi-rigid, it does not stretch like an elastic wrap. You cannot rely on stretch to correct a loose or uneven application. Instead, overlap and tension control the compression, which is why the steps below focus on those two details.

When to use a different compression approach

Unna-Z is intended for venous ulcers and edema with mild compression. If the patient has significant arterial disease, uncompensated heart failure, or severe neuropathy, a semi-rigid zinc oxide bandage may not be appropriate. In those cases, ask the prescribing clinician about alternative compression or no-compression options.

Also check the wound status. The zinc oxide paste helps treat minor wounds and supports a moist healing environment, but heavily exuding or infected wounds need clinical review before wrapping. This guide does not replace a clinician's wrapping prescription or wound care plan.

Unna boot steps

Prepare the leg and materials: Clean and dry the leg as directed by the wound care plan, then place the Unna-Z bandage within reach. Remove the plastic core only when you are ready to wrap so the bandage does not unroll or pick up debris. Have the wrap open and ready before you touch the leg; stopping mid-wrap to find supplies usually leads to uneven tension.
Start at the base of the toes: Anchor the bandage at the base of the toes with one full turn, keeping the fabric flat. Do not start at the ankle or mid-foot, because the wrap can slip and leave the toes unprotected. Leave the toes exposed so you can check color and temperature after wrapping.
Wrap with 50% overlap: Work upward toward the knee, covering half of the previous turn with each new turn. A 50% overlap is the standard checkpoint for Unna-Z; less overlap can leave gaps, and more can bulk the wrap and reduce flexibility. Count the turns as you go; if you lose track of overlap, unwrap and restart rather than patching.
Keep tension light and even: Apply the bandage with mild, consistent tension. The wrap should conform without pulling tight. Because Unna-Z is semi-rigid, you cannot stretch it to compensate for a loose turn, so keep the same tension from ankle to knee. If the fabric wrinkles or bunches, lift and reapply that turn instead of smoothing it down.
Stop below the knee: End the wrap just below the knee, not across the knee joint. Wrapping over the knee can restrict movement and cause the bandage to roll down. Secure the end with the supplied fastener or tape as directed. Ask the patient to flex the knee gently after wrapping; the bandage should stay in place without tugging.
Check circulation and fit: Inspect the toes for color, warmth, and sensation, and ask about numbness or tingling. If any of these are abnormal, remove the bandage and rewrap with less tension. Document the check as part of the wrap routine. A correct Unna-Z wrap feels firm but not painful; pain or cool toes means the wrap is too tight.

Product facts

Unna-Z Zinc Oxide Compression Bandages: Unna-Z Zinc Oxide Compression Bandages are semi-rigid and come with a plastic core for easier application. The plastic core helps you start the wrap without twisting the fabric, which keeps tension even from the first turn.
Unna-Z Zinc Oxide Compression Bandages