Heel pressure ulcers: understanding why they develop and how to prevent them
Intended for healthcare professionals

Open Access Heel pressure ulcers: understanding why they develop and how to prevent them

Clare Greenwood Clinical nurse specialist, tissue viability, St James’s University Hospital, Leeds Teaching Hospitals NHS Trust, Leeds, England

Why you should read this article
  • To enhance your awareness of the heel as a high-risk area for pressure ulcers

  • To acknowledge the importance of assessing patients’ risk of developing pressure ulcers

  • To read about techniques and devices that can be used to prevent heel pressure ulcers

Because of its anatomical location and the fact that it has no muscle or fascia and little subcutaneous tissue, the heel is highly vulnerable to pressure damage and pressure ulcer development. Heel pressure ulcers are often severe and challenging to heal. Heel pressure ulcers are caused by factors such as pressure, shear and friction and the vulnerability of the heel to pressure damage is increased by immobility, the patient’s skin status, the presence of previous pressure ulcers and/or scar tissue, and suboptimal tissue perfusion. The risk is also increased in patients with diabetes mellitus. The role of nurses includes assessing the risk and preventing the development of heel pressure ulcers. This article discusses the causes of, and risk factors for, heel pressure ulcers and describes techniques and devices that nurses can use to prevent them.

Nursing Standard. doi: 10.7748/ns.2021.e11740

Peer review

This article has been subject to external double-blind peer review and checked for plagiarism using automated software




Conflict of interest

None declared

Greenwood C (2021) Heel pressure ulcers: understanding why they develop and how to prevent them. Nursing Standard. doi: 10.7748/ns.2021.e11740

Open access

This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (CC BY-NC 4.0) licence (see https://creativecommons.org/licenses/by-nc/4.0/) which permits others to copy and redistribute in any medium or format, remix, transform and build on this work non-commercially, provided appropriate credit is given and any changes made indicated.

Published online: 13 December 2021

Aims and intended learning outcomes

This article aims to enhance nurses’ awareness and understanding of the heel as a high-risk area for pressure ulcers, risk factors for developing pressure ulcers, and optimal prevention techniques and devices. The article is based on the author’s clinical experience as well as on the available guidance and literature. After reading this article and completing the time out activities you should be able to:

  • Explain why the anatomy of the heel makes it particularly vulnerable to pressure damage.

  • Identify the patient groups that are at increased risk of developing heel pressure ulcers.

  • Understand the importance of preventing heel pressure ulcers.

  • Describe prevention techniques and devices.

Key points

  • The anatomy of the heel makes it highly vulnerable to pressure damage

  • Heel pressure ulcers can cause pain, reduce mobility, prolong hospital stays and potentially result in amputation

  • Risk factors for heel pressure ulcers include immobility, skin status, presence of previous pressure ulcers and/or scar tissue and suboptimal tissue perfusion

  • Careful consideration of possible causes is needed to differentiate between a heel pressure ulcer and a diabetic foot ulcer located on the heel

  • Optimal moving and handling, and regular repositioning are crucial for heel pressure ulcer prevention

  • Patients at risk of heel pressure ulcers may benefit from medical devices designed to offload the heel, maintain a low pressure or reduce shear and friction


Pressure ulcers, which in the past were also known as bed sores, pressure injuries or decubitus ulcers, have been defined as ‘localised damage to the skin and/or underlying tissue, as a result of pressure or pressure in combination with shear’, which ‘usually occur over a bony prominence but may also be related to a medical device or other object’ (European Pressure Ulcer Advisory Panel (EPUAP) et al 2019).

Pressure ulcers can have a significant negative effect on a person’s health-related quality of life, including the physical, mental, emotional and social aspects of their everyday life (Spilsbury et al 2007, Gorecki et al 2009). Pain is a significant debilitating symptom in patients who develop a pressure ulcer (Briggs et al 2013, McGinnis et al 2014a). Pressure ulcers can cause serious infections that can lead to osteomyelitis and sepsis, which in turn may lead to multiple organ failure and amputation and can ultimately be fatal (Gorecki et al 2009). Pressure ulcers are a common occurrence and therefore represent a significant financial burden on healthcare services due to the costs of treatment, nursing care and prolonged hospital stays (Guest et al 2015).

Pressure ulcers are categorised according to their depth and severity. The most widely used staging tool categorises pressure ulcers in four categories, from category 1 (intact skin with a localised area of non-blanching erythema) to category 4 (full-thickness skin and tissue loss with exposed or directly palpable fascia, muscle, tendon, ligament, cartilage or bone) (EPUAP et al 2019). The staging tool includes two additional categories: unstageable pressure ulcer, where the extent of skin and tissue loss is unknown because it is obscured by slough or necrotic tissue; and suspected deep tissue injury, where deeper damage is suspected because of the presence of persistent non-blanching bruising, a dark wound bed or a blood-filled blister (EPUAP et al 2019).


Reflect on a patient you have cared for who developed a heel pressure ulcer. Was the category of the pressure ulcer established? Were the potential causes of the heel pressure ulcer investigated? Did it heal and if so, how long did it take?

Significance of the heel as a high-risk area for pressure ulcers

After the sacrum, the heel is frequently reported as the second most common site for the development of pressure ulcers, as well as the site where the most severe pressure ulcers tend to develop (Greenwood 2020). Heel pressure ulcers can cause pain, reduce mobility and in severe cases result in amputation (Fowler et al 2008). Heel pressure ulcers can be challenging to heal. In a cohort of 140 patients with heel pressure ulcers categorised as category 2 or above recruited to a prospective cohort study in one large teaching hospital in the UK, only 42% were reported to have healed over the 18-month study period (McGinnis et al 2014b).

The anatomy of the heel – shown in Figure 1 – makes it highly vulnerable to pressure damage. The heel is located at the posterior aspect of the foot. It includes the calcaneus (heel bone) and is composed of skin and bone, with no muscle or fascia (connective tissue) and little protective subcutaneous tissue (Davies 2018). The plantar aspect of the heel has a thickened dermis and a large, tough but elastic fat pad, which is designed to absorb the forces from the calcaneus during movement and when the individual is standing upright. The back of the heel has minimal cushioning, with no muscle and only a thin layer of subcutaneous tissue between the skin and the bone measuring approximately 3.8mm (Cichowitz et al 2009). This subcutaneous tissue is attached to underlying deep fascia and the fibres of the Achilles tendon. The Achilles is the strongest and largest tendon in the body, but its suboptimal vascular supply and the high tensions it is subjected to make it prone to injuries including pressure ulcers (Cichowitz et al 2009).

Figure 1.

Anatomy of the heel



Do the risk assessments used in your clinical area include risk factors for pressure ulcers? What do you need to consider in your risk assessment to identify patients who are at high risk of developing pressure ulcers on the heel?

Causal factors in the development of heel pressure ulcers

Direct causal factors in the development of heel pressure ulcers include the duration and magnitude of any pressure exerted on the heel. The ability of soft tissues to tolerate the effects of pressure is influenced by intrinsic factors (those originating from within the body) such as malnutrition, diabetes mellitus and conditions that affect the circulation, and by extrinsic factors (those originating from outside of the body) such as shear, friction and moisture (Braden and Bergstrom 1987, Defloor 1999). Other causal factors that can directly increase the vulnerability of the heel to pressure damage include immobility, the patient’s skin status, the presence of previous pressure ulcers and/or scar tissue, and suboptimal tissue perfusion (Coleman et al 2014). While immobility is a significant risk factor for heel pressure ulcers, the nurse should always consider other causal factors which may act in combination with immobility to produce pressure ulcers on the heel.

Immobility, shear and friction

Patients who spend significant periods of time in a supine position, for example those on extended bedrest, may find that their feet tend to abduct (rotate externally). This rotation causes pressure to pass through the lateral (outer) aspect of the heel to the calcaneus, where the fat pad is thin and irregularly shaped (Tenenbaum et al 2013). Patients who have undergone surgery are at increased risk of heel pressure ulcers because analgesia and anaesthesia reduce their pain responses to pressure and because they are immobilised for prolonged periods (Edwards et al 2006). Orthopaedic and vascular surgical interventions may require postoperative immobilisation of the lower limb.

Shear and friction are common extrinsic factors increasing the risk of heel pressure ulcers. Shear occurs when the bones and the skin move in opposite directions – for example during suboptimal repositioning where the patient is pulled along the bed – and is a common issue in patients with suboptimal mobility (Davies 2018). Shear affecting the heels can occur if the patient slides downwards due to inadequate positioning in a chair or bed, or if the patient uses their heels as a pivot point when repositioning themselves. Friction can be described as the mechanical force exerted when a patient is moved across a coarse surface such as bed sheets, which prevents the skin from sliding along smoothly (Gleeson 2016). Friction to the heel can be caused by a suboptimal moving and handling technique or by frequent foot movements, for example in patients experiencing tremors or agitation.

Skin status and presence of pressure ulcers

The presence of a category 1 pressure ulcer is correlated with a two-to-threefold increase in a patient’s risk of developing a more severe pressure ulcer (Nixon et al 2007). The presence of scar tissue and the presence of dry, thin or oedematous skin also increase the pressure ulcer risk. Ageing has been found to increase the risk of pressure ulcers due to the thinning of the epidermis (outer layer of the skin) as part of the normal ageing process (Baumgarten et al 2006). Ageing also causes the skin to become dehydrated and lacking in sebum (Tong et al 2016), connective tissue to lose its elasticity and strength, and blood vessels to become increasingly fragile (Defloor 1999). Furthermore, subcutaneous tissues become thinner with age, which reduces the already minimal padding over the calcaneus and reduces the heel’s capacity to absorb shock (Alcántara et al 2002).

Suboptimal tissue perfusion

The lower limbs are particularly vulnerable to reduced perfusion, which causes a reduction in the supply of oxygen and nutrients to the tissues in the foot. Suboptimal lower limb perfusion has been estimated to affect 50-62% of patients with a heel pressure ulcer (Meaume and Faucher 2008, McGinnis et al 2014b). Examples of conditions that can cause suboptimal tissue perfusion include cardiovascular disease or coronary artery disease, diabetes, infections, peripheral vascular disease, stroke and renal disease. Suboptimal tissue perfusion can also be caused by the effects of cigarette smoking, hypotension, hypoalbuminaemia and the use of inotropes (medicines that affect the strength of heart contractions) to support cardiac function (Coleman et al 2014, EPUAP et al 2019).

When a patient is acutely unwell, their sympathetic nervous system preserves their vital organs – notably the heart and brain – by increasing circulation to these organs, which in turn results in decreased circulation to the peripheries. Vasopressors (medicines that induce vasoconstriction and raise blood pressure) work in a similar way. Therefore, acutely unwell patients such as those in intensive care settings are at higher risk than others of developing heel pressure ulcers (Coleman et al 2014, EPUAP et al 2019).

Peripheral vascular disease refers to any disease or disorder of the circulatory system outside the brain and heart. Peripheral vascular disease frequently affects the lower limbs and is caused by arteries becoming narrowed, weakened or blocked, resulting in reduced circulation to the feet. Peripheral vascular disease is commonly associated with older age but can also affect younger people who smoke or those with diabetes or hypertension (Tendera et al 2011).

Circulatory conditions such as peripheral vascular disease can lead to an increase in pedal (foot and ankle) oedema, which impairs the delivery of oxygen and nutrients to the tissues as well as the disposal of metabolic waste. Oedema can cause stiffening of the tissues, which affects pressure distribution, leading to greater stress during loading (when force and/or pressure is exerted through the tissues) (Gefen 2010). Oedematous lower limbs are also heavier, which can increase the pressure exerted on the heels.


If a patient with diabetes develops an ulcer on their heel, how will you decide whether it is a diabetic foot ulcer or a pressure ulcer? Consider factors such as the patient’s mobility, the exact location of the ulcer on the heel, the quality of perfusion to the heel area and whether the patient has any sensation in the foot

Diabetes mellitus

Extended periods of hyperglycaemia as a result of diabetes can cause a thickening and interlinking of collagen fibres in the connective tissues, leading to progressive tissue stiffening (Gefen 2010). Diabetes can also cause foot ulceration, primarily over pressure points such as the toes and the plantar foot, often caused by accidental trauma, ill-fitting footwear and/or peripheral neuropathy (Jeffcoate and Harding 2003). Peripheral neuropathy involves nerve damage to the peripheral nervous system and can cause numbness as well as pain and weakness (Howarth 2019). Patients with peripheral neuropathy therefore become unaware of pain and pressure sensations that would normally indicate the need to reposition the foot and avoid trauma. As well as diabetes, peripheral neuropathy can also be caused by stroke, alcoholism, demyelinating diseases such as multiple sclerosis, and Guillain-Barré syndrome, a rare and serious condition that affects the nerves in the hands and feet (White et al 2004).

In patients with diabetes, it can be challenging for the nurse to differentiate between a diabetic foot ulcer located on the heel and a heel pressure ulcer. In this situation, the nurse needs to carefully consider the cause of the ulcer. For example, if the patient is immobile or bedbound and the ulcer affects the posterior aspect of the heel, it is likely to have been caused by pressure. Conversely, in a mobile patient or one whose ulcer is located on the plantar aspect of the heel, ill-fitting footwear may need to be considered as a potential cause. Regardless of the cause, any patient with diabetes and signs of foot ulceration should be referred to a multidisciplinary foot care service (National Institute for Health and Care Excellence (NICE) 2019).


Think back to a bedbound patient you have cared for. When you repositioned the patient in bed, did you pay attention to how much their feet were moving during turning and to whether their heels were dragging along the bedsheets? What strategies did you use to reduce their risk of developing a heel pressure ulcer?

Prevention of heel pressure ulcers

Because the development of a pressure ulcer is rarely due to a single causative factor, prevention strategies involve the nurse identifying each patient’s individual risk factors, as described previously – for example, immobility, skin status, presence of pressure ulcers and/or scar tissue, and suboptimal tissue perfusion. This should involve a holistic risk assessment along with a thorough skin assessment. The signs of pressure damage that the nurse should look for when examining a patient’s heels include any signs of redness, and whether the skin blanches (turns white when pressure is applied). It is not always possible to identify redness on darkly pigmented skin, so the nurse should assess for other signs of pressure damage including localised heat, oedema, blistering and induration (hardness) (Mitchell 2018).

In the UK, NICE states that patients in NHS secondary or long-term care must undergo a pressure ulcer risk assessment within six hours of admission (NICE 2014). If a patient is found to be at risk of pressure ulcers, a preventive care plan should be initiated.

An optimal moving and handling technique is crucial to prevent the development of pressure ulcers – but its description is beyond the scope of this article. Another crucial component of any pressure ulcer preventive care plan is reducing the duration of pressure to the heels through regular repositioning. In some patients, however, regular repositioning may not be possible or may be insufficient to prevent the development of heel pressure ulcers. This is the case, for example, in some patients with peripheral arterial disease or those with immobilised limbs such as in lower limb fractures or those who may have been sedated in critical care. In these cases, the nurse may use their clinical judgement to decide that medical devices – such as support surfaces, heel-specific devices, pillows, wedges and prophylactic dressings – can be used to minimise the risk of heel pressure damage.


Consider a patient you have cared for whose heels started to show signs of pressure damage. What techniques and devices did you use to prevent the development of a heel pressure ulcer? What was the rationale for your choice of device? Was your preventive care plan effective?

Support surfaces

The term support surface refers to mattresses, overlays and cushions. Support surfaces are generally divided into two categories: alternating pressure surfaces and constant low-pressure surfaces.

Alternating pressure devices work by reducing the duration of pressure exerted at the body’s points of contact with the device. For example, alternating pressure mattresses use air-filled cells that inflate and deflate alternately during a set cyclical time period (usually every 5-10 minutes). Some alternating pressure mattresses contain specific ‘heel zones’ that feature an area of air-filled cells designed to reduce pressures at the heel.

Constant low-pressure devices distribute the body’s weight over a larger surface area, reducing the pressure exerted on all body parts (McInnes et al 2015). They include foam mattresses, low air-loss mattresses and overlays.

There is little evidence regarding the effectiveness of support surfaces in preventing heel pressure ulcers specifically, but they are frequently used as part of a multifaceted care plan (Greenwood 2020).

Heel-specific devices

Any heel-specific device should increase blood flow to the heel area, reduce pressure and prevent shear. The device should be comfortable, practical – in that it can be used in all positions and during mobilisation – and cost-effective (Huber et al 2008). It should also minimise hyperextension of the knee, because this can compress the popliteal vein and contribute to the development of deep vein thrombosis (Huber and Huber 2009). There are several types of heel-specific devices, which can generally be categorised as:

  • Heel-offloading devices.

  • Heel-specific constant low-pressure devices.

  • Heel-specific low-friction devices.

Heel-offloading devices

Heel-offloading devices work by maintaining surface contact with the foot and lower leg while ‘floating’ or suspending the heel. Heel-offloading devices vary in design and materials and can be single-use or re-usable. When used effectively, they can fully offload the heel and be used for up to 24 hours per day. Some designs reduce shear and friction and/or assist in preventing footdrop, where prolonged bedrest causes an over-stretching of the muscles and nerves and weakness in the lower limb. One meta-analysis demonstrated a reduction in heel pressure ulcer development with the use of offloading devices compared with standard care. However, further research is required because the quality of the available evidence was rated as low to moderate (Greenwood et al 2020a).

Heel-specific constant low-pressure devices

Heel-specific constant low-pressure devices reduce pressure to the heel by providing padding under the foot, thereby increasing the surface contact area. They include ‘booties’, heel cups or overlays that sit under the heel and can be made of foam, sheepskin, gel or other materials. There is little evidence of their clinical effectiveness (Greenwood et al 2020a). However, in the author’s clinical experience, they can be beneficial in certain situations; for example, some heel-specific constant low-pressure devices can be used as orthotic insoles in those at risk of heel pressure damage or during lower-limb surgery and vascular radiology, during which limb stability is essential and the heel cannot be repositioned.

Heel-specific low-friction devices

In patients who find it challenging to contain movement in the lower limb, such as those experiencing tremors or agitation, the priority is to reduce shear and friction rather than pressure. In such cases, according to the author’s clinical experience, foam dressings or ‘booties’ designed to reduce shear and friction can be more appropriate than offloading or constant low-pressure devices.

Pillows and wedges

In clinical practice, pillows and wedges are commonly used to offload pressure. Pillows and wedges are practical short-term methods that can be used in patients who are alert and co-operative and can maintain the same position (EPUAP et al 2019). They are less suited for more mobile patients, patients demonstrating signs of agitation and patients who frequently move the lower limb. They do not assist in preventing footdrop.

Pillows and wedges should be placed under the full length of the patient’s calf, avoiding hyperextension of the knee, with the heel suspended above the mattress. If the pillow or wedge is placed inappropriately, the heel may still be in contact with a hard surface area of the bed. The thickness of pillows and wedges varies. If they are too thin or if the limb is too heavy, the heel may not be fully offloaded. Figure 2 shows the appropriate heel elevation using a pillow.

Figure 2.

Appropriate heel elevation using a pillow


Prophylactic dressings

Studies have demonstrated that foam dressings can reduce pressure as well as shear and friction (Levy et al 2015, Levy and Gefen 2016). Nakagami et al (2006) found that simple film dressings could limit the effects of shear, while according to a systematic review by Moore and Webster (2018) that investigated dressings and topical agents for preventing pressure ulcers, the incidence of pressure ulcers in all body areas was reduced with the use of silicone foam dressings. However, further evidence is required due to the suboptimal quality of some of the trials. In terms of the heel area specifically, there is no direct evidence of the effectiveness of any of these dressings (Greenwood et al 2020b).

Homemade devices

Historically, nurses have found resourceful solutions when seeking to relieve pressure on their patients’ heels, often using homemade devices to prevent the development of pressure ulcers. These homemade solutions include using water-filled latex gloves to cushion the heel and intravenous fluid bags placed under the heel to increase elevation. However, it has been known for some time that water-filled gloves can lead to higher pressures at the heel, while intravenous fluid bags can increase the pressure at the Achilles tendon (Lockyer-Stevens 1993, Williams 1993). Therefore, while resourceful, these methods are not recommended.

Implications for practice

In terms of pressure ulcer prevention, the heel area requires specific attention and treatment because of its unique anatomy and its vulnerability to the effects of impaired peripheral circulation. The early identification of at-risk patients and signs of pressure damage followed by the initiation of a preventive care plan can reduce the risk and occurrence of pressure ulcers. All members of the nursing team are responsible for assessing the patient’s skin, identifying signs of pressure damage, assessing it accurately and implementing the preventive measures discussed previously.

When caring for a patient at risk of heel pressure ulcers, the nurse can seek advice from the local tissue viability nurse specialist who will be able to provide guidance on appropriate medical devices. Tissue viability nurse specialists can also advise on patients who may be at high risk of developing heel pressure ulcers, such as patients who are immobile, patients with diabetes and/or patients who may not adhere to their treatment, as well as on measures to prevent heel pressure damage (Ousey et al 2014).


Heel pressure ulcers can have a significant negative effect on a patient’s health-related quality of life, causing pain, reducing mobility, prolonging hospital stays, and in severe cases resulting in amputation. Techniques and devices, if appropriately selected and implemented, can reduce the effects of pressure, shear and friction on patients’ heels and prevent the development of heel pressure ulcers, thereby helping to maintain patients’ quality of life. Therefore, it is important that nurses understand how and why pressure damage may develop on the heel, how to assess the risk of heel pressure ulcers, and which preventive measures they should implement.


Consider how understanding the development and prevention of heel pressure ulcers relates to the Code: Professional Standards of Practice and Behaviour for Nurses, Midwives and Nursing Associates (Nursing and Midwifery Council 2018) or, for non-UK readers, the requirements of your regulatory body


Now that you have completed the article, reflect on your practice in this area and consider writing a reflective account: rcni.com/reflective-account

Further resources

National Wound Care Strategy Programme – Leg and Foot Ulcers


Legs Matter!


Pressure Ulcer Prevention and Management Resources


Helping to Prevent Pressure Ulcers: A Quick Guide for Registered Managers of Care Homes


Pressure Ulcers: Applying All Our Health



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