Written by Kathleen Sodder (Head of Clinical Education) 

Pressure injury prevention in wheelchair seating is not simply a cushion decision. It is a clinical reasoning process that considers posture, tissue tolerance, pressure redistribution, shear, microclimate, movement, skin monitoring, nutrition, equipment set-up, and the person’s daily routine.

A pressure injury may occur when sustained pressure, or pressure combined with shear, damages the skin and underlying tissue. In wheelchair seating, the pelvis and thighs are exposed to prolonged loading over areas such as the ischial tuberosities, sacrum, coccyx, and greater trochanters.[1]

For clinicians, the goal is not only to reduce peak pressure. The broader aim is to support a stable, functional posture while reducing sustained loading and shear, enabling regular pressure redistribution, and supporting safe participation in daily life.[2]

Key Contributing Forces

Understanding the forces involved helps clinicians look beyond cushion softness and consider how the person, posture, equipment, and routine interact.

• Pressure is prolonged mechanical force that compresses soft tissue between the body and a support surface. When pressure is sustained, it can reduce blood flow and contribute to tissue damage.[1]
• Shear occurs when tissue layers are pulled or distorted in different directions. In wheelchair seating, this may happen when the pelvis slides forward, when recline is used without adequate pelvic stability, or when the seating system encourages sliding.[3]
• Friction is the rubbing of one surface against another. It can damage the outer layer of skin and increase vulnerability to pressure and shear. Transfers, clothing seams, hoist slings, and sliding in the seat may all contribute.[2]
• Ischaemia is reduced blood supply to tissue. Without enough oxygen and nutrients, tissue becomes more vulnerable to breakdown and delayed healing.[3]

These forces often occur together. This is why pressure injury prevention should be approached as a whole seating and routine-based plan, not a single product choice.

Pressure Injury Stages: Quick Clinical Reference

Clinicians should follow local wound care pathways and staging guidance, but a shared understanding of terminology supports early recognition and escalation.

• Stage 1: The skin is intact but has a localised area of non-blanchable redness or colour change. In darker skin tones, this may present as changes in colour, temperature, firmness, or sensation.[1]
• Stage 2: There is partial-thickness skin loss with exposed dermis. This may appear as a shallow open wound or an intact or ruptured blister.[1]
• Stage 3: There is full-thickness skin loss. Adipose tissue may be visible, and slough or eschar may be present. Deeper structures such as muscle, tendon, or bone are not exposed.[1]
• Stage 4: There is full-thickness skin and tissue loss with exposed or directly palpable deeper structures such as fascia, muscle, tendon, ligament, cartilage, or bone.[1]
• Deep Tissue Pressure Injury: This may present as persistent deep red, maroon, or purple discolouration, with intact or non-intact skin. It suggests damage to deeper soft tissue, often from intense or prolonged pressure and shear.[1]

For people with reduced sensation, the absence of pain is not reassuring. Tissue damage may be present before discomfort is felt, or discomfort may not be felt at all.

Skin inspection is critical, especially for people with reduced sensation. Users, families, and support teams should know what to look for and when to escalate.

Warning signs may include:

1. Persistent redness or colour change that does not resolve after offloading
2. Purple, maroon, or darker discolouration
3. Blistering, broken skin, or open areas
4. Local heat, swelling, firmness, bogginess, or tenderness
5. New pain or discomfort where sensation is present
6. Changes over a previous wound site

If a concerning change is noticed, the person should reduce or stop loading the area and seek prompt advice from an appropriate healthcare professional, such as a GP, wound clinician, nurse, occupational therapist, physiotherapist, rehabilitation physician, or spinal service.

Why Wheelchair Users May Be at Higher Risk

People who use wheelchairs for long periods may have reduced ability to change position, reduced sensation, impaired circulation, altered muscle tone, asymmetrical posture, nutritional compromise, moisture exposure, or a previous pressure injury history.

This means two people can sit on the same cushion and have very different outcomes. Risk depends on posture, sensation, movement, skin condition, continence, nutrition, equipment set-up, sitting duration, transfer method, and whether the person can reliably relieve pressure.

A helpful clinical principle is:

Pressure injury risk is created by both load and the person’s ability to tolerate or relieve that load.

People with spinal cord injury are a particularly high-risk group because impaired sensation and reduced movement can limit natural protective responses such as discomfort, fidgeting, and spontaneous weight shifts.[4]

Start With the Whole Person, Not the Cushion

A common trap is to begin with, “What cushion does this person need?” While cushion selection is important, it should sit within a broader seating and pressure management plan.

A seating assessment should consider:

1. Pressure injury history and previous wound location
2. Sensory status
3. Ability to independently reposition
4. Pelvic position, spinal alignment, asymmetry, tone, and deformity
5. Transfer method and potential friction or shear
6. Skin condition, continence, moisture exposure, and temperature regulation
7. Nutrition, hydration, weight change, and general health
8. Daily sitting duration, routines, transport, and carer support
9. Wheelchair configuration, including cushion, back support, foot support, arm support, head support, and powered positioning

The more useful clinical question is:

How will this person protect their skin during wheelchair use and throughout their everyday routine?

Pressure Redistribution: More Than Cushion Softness

A pressure redistribution cushion should help spread load, accommodate body shape, and reduce excessive tissue deformation. Current international guidance recommends using seated support surfaces with pressure redistribution properties for people at risk of pressure injuries when seated.[2]

However, no cushion should be viewed in isolation. A high-quality cushion may still be ineffective if the pelvis is poorly supported, seat depth is incorrect, foot supports are poorly positioned, the back support encourages sliding, or the user does not have a realistic way to reposition.

When selecting a cushion, consider body shape, pelvic stability, posture, skin history, transfer method, sitting duration, continence, functional goals, and maintenance requirements.

The practical solution is to match the cushion to the person’s body, posture, risk, and routine — not just their diagnosis.

Using Pressure Mapping With Clinical Judgement

Interface pressure mapping can help identify areas of high pressure, compare cushion options, demonstrate asymmetry, and show the effect of seating changes such as pelvic positioning, foot support adjustment, backrest angle, or tilt use.

It can also support education. For users with reduced sensation, visual feedback may help demonstrate whether a weight shift or powered seating position is changing load at high-risk areas.[4]

However, pressure mapping should not replace clinical judgement. It does not directly measure tissue health, shear, perfusion, pain, microclimate, or what happens across a full day of real-life use.

Use pressure mapping as a comparison tool, not a pass-or-fail test. Ask:

1. Did the change reduce loading over a known risk area?
2. Did it improve pelvic stability or increase sliding?
3. Can the person still function and transfer safely?
4. Is the result consistent with skin history and clinical presentation?

Powered Positioning: Prescribe It, Then Train It

Power positioning can be an important pressure management strategy, particularly for people who cannot reliably perform independent weight shifts.

Tilt-in-space and recline may help redistribute load, alter forces through the pelvis, and support comfort, posture, fatigue management, swallowing, respiratory function, and visual access. Research also shows that tilt and recline can influence both normal and shear forces in the gluteal region, reinforcing the need to consider more than pressure alone.[5]

The key clinical issue is not only whether the chair has tilt or recline. It is whether the person can use these functions at clinically meaningful angles, for adequate duration, and often enough within their routine.

The practical solution is to include training, programming, and follow-up. Consider whether the person can access controls, whether memory positions may support consistency, whether the pelvis remains stable during movement, and whether carers understand when and how to assist.

Small changes in position may help comfort or function, but they should not automatically be assumed to provide sufficient pressure redistribution for every high-risk user.

Repositioning and Movement

Regular repositioning remains central to pressure injury prevention, but there is no single schedule that suits everyone. Evidence reviews continue to show uncertainty about the most effective repositioning frequency, so pressure management should be individualised based on risk, skin response, support surface, comfort, function, and the person’s ability to move.[6]

For wheelchair users, pressure redistribution may include forward leans, side leans, push-ups where safe, powered tilt and recline, assisted repositioning, scheduled breaks from sitting, or functional movement throughout the day.

The key clinical question is:

How does this person reliably redistribute pressure during wheelchair use?

This should be considered within the person’s broader 24-hour routine. While the focus remains wheelchair seating, clinicians should also be aware of time spent in other positions, such as bed, transport, shower chairs, commodes, recliners, or therapy equipment. These may influence tissue tolerance, skin recovery, fatigue, and overall pressure injury risk.[2]

A pressure care plan should remain wheelchair-focused while acknowledging the person’s daily routine. It should account for cognition, fatigue, hand function, pain, spasticity, work or school routines, transport, carer availability, and whether the person actually uses the recommended strategy.

The best plan is not the most complex one. It is the one the person can realistically and consistently use.

Nutrition, Hydration, Moisture, and Health Changes

Seating interventions are only one part of pressure injury prevention. Tissue tolerance is also influenced by nutrition, hydration, perfusion, illness, oedema, continence, moisture, temperature, and general health.[1,7]

Clinicians should consider dietitian referral where there is unintentional weight loss, poor intake, low body mass, delayed wound healing, or recurrent pressure injury. Nutritional status is a potentially modifiable risk factor and should be considered as part of pressure injury prevention planning.[7]

Moisture and heat build-up also matter. Cushion covers, continence products, clothing seams, pads, hoist slings, prolonged occlusion, and heat during prolonged sitting may all affect skin risk.[8]

When to Review Seating and Pressure Management

Pressure risk can change over time. A seating system that previously worked well may need review if the person experiences weight change, illness, surgery, increased fatigue, change in tone or posture, new pain, change in continence, altered sitting tolerance, or any skin marking.

Seating reviews should ask:

1. Where are the known or likely high-risk areas?
2. Can the person independently offload?
3. Is the pelvis stable?
4. Is the cushion still appropriate?
5. Are the back and foot supports helping or contributing to risk?
6. Is the person using tilt and recline effectively?
7. Is there a clear escalation plan if skin changes occur?
8. Has the person’s broader routine changed in a way that may affect pressure management?

How Quantum Rehab Australia Can Support Clinicians

At Quantum Rehab Australia, seating and positioning are viewed as clinical tools that support comfort, posture, function, participation, and pressure management.

Our role is to support informed clinical reasoning. This includes helping clinicians understand how power positioning, tilt, recline, seating configuration, drive access, and programming can work together as part of a broader pressure care strategy.

We encourage clinicians to connect with Quantum Rehab Australia for practical education, clinical discussion, product knowledge, and resources that help translate seating principles into real-world prescription decisions.

Final Clinical Takeaway

Pressure injury prevention in wheelchair seating is proactive, not reactive.

A well-prescribed seating system can reduce risk, but it must be paired with regular pressure redistribution, skin monitoring, education, nutrition and moisture management, timely clinical review, and awareness of the person’s broader 24-hour routine.

For clinicians, the most important question is not only:

What cushion does this person need?

It is:

How will this person protect their skin during wheelchair use and throughout their everyday routine?

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References

[1] National Pressure Injury Advisory Panel. NPIAP Pressure Injury Stages. 2016.

[2] National Pressure Injury Advisory Panel, European Pressure Ulcer Advisory Panel, and Pan Pacific Pressure Injury Alliance. Prevention and Treatment of Pressure Ulcers/Injuries: Quick Reference Guide. The International Guideline: Fourth Edition, Prevention Recommendations. Haesler E, ed. 2025.

[3] Gefen A, Brienza DM, Cuddigan J, Haesler E, Kottner J. Our contemporary understanding of the aetiology of pressure ulcers/pressure injuries. International Wound Journal. 2022;19(3):692–704.

[4] Vos-Draper TL, Morrow MMB, Ferguson JE, Mathiowetz VG. Effects of real-time pressure map feedback on confidence in pressure management in wheelchair users with spinal cord injury: pilot intervention study. JMIR Rehabilitation and Assistive Technologies. 2023;10:e49813.

[5] Koda H, Okada Y, Fukumoto T, Morioka S. Effect of tilt-in-space and reclining angles of wheelchairs on normal force and shear force in the gluteal region. International Journal of Environmental Research and Public Health. 2022;19(9):5299.

[6] Gillespie BM, Walker RM, Latimer SL, Thalib L, Whitty JA, McInnes E, Chaboyer WP. Repositioning for pressure injury prevention in adults. Cochrane Database of Systematic Reviews. 2020.

[7] Chen B, Yang Y, Cai F, Zhu C, Lin S, Huang P, Zhang L. Nutritional status as a predictor of the incidence of pressure injury in adults: a systematic review and meta-analysis. Journal of Tissue Viability. 2023;32(3):339–348.

[8] Kottner J, Black J, Call E, Gefen A, Santamaria N. Microclimate: a critical review in the context of pressure ulcer prevention. Clinical Biomechanics. 2018;59:62–70.