Heel Pressure Injury Prevention and Treatment Protocol

Heel pressure injuries are among the most preventable and most frequently encountered wounds in mobile wound care. The heel is the second most common anatomical site for pressure injuries after the sacrum, yet heel-specific prevention receives far less attention in clinical protocols. Heel pressure injury prevention demands a targeted approach because the anatomy of the heel creates unique vulnerability — a large bony prominence covered by thin, poorly vascularized tissue with minimal subcutaneous padding. Standard pressure redistribution mattresses that adequately protect the sacrum often fail to protect the heel.

This guide covers heel-specific prevention strategies, suspension devices, treatment approaches by stage, and documentation requirements for mobile wound care practitioners.

Why the Heel Demands Separate Prevention Strategy

The calcaneus is the largest tarsal bone and bears the full weight of the lower extremity when the patient is supine. Unlike the sacrum, which distributes pressure across a broad surface area, the heel concentrates force on a relatively small, curved bony prominence. The tissue overlying the calcaneus has several characteristics that increase vulnerability:

Limited blood supply: The posterior heel receives perfusion primarily from branches of the posterior tibial and peroneal arteries. This vascular watershed zone means even moderate external pressure can occlude blood flow.
Minimal subcutaneous tissue: The heel pad consists of specialized fat compartments separated by fibrous septae. In elderly or malnourished patients, this padding thins significantly, reducing the distance between the calcaneus and the skin surface to millimeters.
Reduced sensation: Patients with diabetes, peripheral neuropathy, or spinal cord injury may have diminished or absent heel sensation, eliminating the pain response that prompts position changes in neurologically intact individuals.
Gravity dependence: The heel rests on the bed surface with the full weight of the lower leg behind it. Unlike lateral body surfaces, the patient cannot easily shift weight off the heel without conscious effort or assistance.

These factors mean that a specialty mattress alone is insufficient. The heel requires its own offloading strategy independent of the support surface.

Heel Suspension Devices: The Primary Prevention Intervention

The most effective prevention strategy for heel pressure injuries is complete offloading — elevating the heel entirely off the bed surface so that zero pressure is applied to the calcaneus. This is achieved through heel suspension devices rather than heel protection devices.

Heel Suspension vs. Heel Protection

The distinction matters clinically and for documentation:

Heel suspension elevates the heel completely off the support surface, distributing the weight of the lower leg along the calf. The heel floats in space with no contact pressure. This is the gold standard for prevention and is required for patients at high risk.

Heel protection devices (foam boots, heel cups, ring cushions) reduce pressure but do not eliminate it. Ring-shaped devices are particularly problematic because they concentrate pressure on the tissue surrounding the ring, potentially creating a new pressure point while failing to adequately offload the calcaneus.

Proper Positioning Technique

Effective heel suspension requires attention to calf support:

The pillow or suspension boot must support the full length of the calf from the popliteal fossa to just proximal to the Achilles tendon
The knee should remain in slight flexion (5-10 degrees) to prevent hyperextension and popliteal vein compression
The foot should maintain a neutral position (90 degrees) to prevent foot drop and equinus contracture
The device must be secured to prevent migration during patient movement or bed repositioning

For patients who are restless or have spasticity, commercially manufactured heel suspension boots provide more reliable offloading than pillow-based methods.

Heel Pressure Injury Treatment by Stage

Treatment follows the same staging framework as pressure injuries at other anatomical sites, but heel-specific considerations apply at every stage. For detailed staging criteria across all anatomical locations, see the pressure injury staging guide.

Stage 1 — Non-Blanchable Erythema

The skin is intact but displays non-blanchable redness over the calcaneus. In darkly pigmented skin, the area may appear differently colored than surrounding tissue, or feel warmer, firmer, or softer than adjacent areas.

Treatment approach: Immediate and complete heel offloading is mandatory. No dressing is required for intact skin, but a skin protectant may be applied. Reassess at every visit. Stage 1 heel pressure injuries can progress to full-thickness tissue loss within 24-72 hours if offloading is not initiated.

Stage 2 — Partial-Thickness Skin Loss

The wound presents as a shallow open ulcer with a red-pink wound bed or an intact or ruptured serum-filled blister. No slough or eschar is present.

Treatment approach: Offloading remains the primary intervention. Apply a moisture-retentive dressing (hydrocolloid or foam) that protects the wound bed without adding bulk that would impede heel suspension device fit. Avoid friction during dressing changes — the fragile wound bed is easily disrupted.

Stage 3 and Stage 4 — Full-Thickness Tissue Loss

Deep tissue destruction involving subcutaneous fat (Stage 3) or extending to muscle, bone, or tendon (Stage 4). The calcaneus may be palpable or visible in Stage 4 injuries.

Treatment approach: Debridement of nonviable tissue, infection management, and advanced wound care. Offloading strategies for heel pressure injuries at these stages often require custom solutions, as the wound dimensions may preclude standard suspension boot use. Coordinate with offloading strategies to determine the optimal device for the wound configuration and patient's functional status.

Unstageable — Heel Eschar

Stable, dry, adherent eschar on the heel is a special case. Per NPUAP guidelines, stable eschar on the heel that is dry, adherent, intact, and without erythema or fluctuance should NOT be debrided. It serves as the body's natural biological cover. This is the one anatomical location where stable eschar is routinely left intact.

Documentation requirement: Document that the eschar is stable (dry, adherent, intact) at every visit. Note the absence of erythema, fluctuance, drainage, or odor. If any of these signs develop, the eschar is no longer stable and debridement should be considered.

Documentation for Heel Pressure Injury Prevention

Documentation must support medical necessity for the prevention intervention and demonstrate the clinical reasoning behind the approach selected.

Required Documentation Elements

Every visit involving heel pressure injury risk should include:

Risk assessment score (Braden Scale) with heel-specific notation
Current heel skin status (intact, erythema, open wound)
Offloading device in place and its type (suspension boot, pillow, custom device)
Patient and caregiver education provided regarding heel inspection and repositioning
Neurovascular status of the lower extremity including pedal pulses and sensation

Compliance and Billing Considerations

Heel pressure injury prevention visits are documented as part of the overall wound care encounter. When the heel injury is the primary reason for the visit, ensure the diagnosis code reflects the specific stage and anatomical location. ICD-10 codes for pressure injuries include laterality and specific body site — the heel has dedicated codes within the pressure ulcer classification that must be used rather than generic lower extremity codes.

Key Takeaways

Heel suspension (complete offloading) is superior to heel protection — devices that reduce but do not eliminate pressure are insufficient for high-risk patients.
Standard pressure redistribution mattresses do not adequately protect the heel — a separate heel-specific offloading strategy is required for every at-risk patient.
Stable, dry, adherent eschar on the heel should not be debrided — this is the only anatomical site where stable eschar is routinely left intact per NPUAP guidelines.
Stage 1 heel pressure injuries can progress to full-thickness loss within 24-72 hours — immediate offloading at first sign of non-blanchable erythema is critical.
Documentation must specify heel as the anatomical site with the corresponding laterality and stage-specific ICD-10 code, not a generic lower extremity pressure injury code.