Pressure sores on the buttocks are one of the most common and preventable skin injuries for anyone who spends long hours sitting or lying down. The good news is that with the right cushion and a simple daily routine, they are largely avoidable.
This guide explains why the buttocks is such a vulnerable area, which cushion types offer the best protection, and what else you can do to keep skin healthy over the long term.
- The ischial tuberosities (sit bones) and sacrum carry intense point pressure when seated for long periods.
- Gel and air-cell cushions provide better pressure distribution than basic foam.
- A cushion alone is not enough: weight shifts every 15 minutes are essential.
- Early warning signs include non-blanching redness, warmth, and skin discolouration.
- If a cushion is not helping, an occupational therapist (OT) or GP review is the right next step.
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Why the Buttocks Is the Highest-Risk Area |
Choosing the Right Cushion |
Beyond the Cushion
Why the Buttocks Is the Highest-Risk Area
The sit bones and sacrum: where pressure concentrates
When you sit, most of your body weight is funnelled down through two small bony points called the ischial tuberosities, or sit bones. These points create intense, concentrated pressure on the skin and tissue beneath them. The sacrum (the flat bone at the base of your spine) and the coccyx (your tailbone) are also vulnerable, particularly when you are sitting in a reclined or semi-reclined position.
Sustained pressure compresses the small blood vessels that keep your skin alive. If pressure is not relieved regularly, the tissue begins to break down from the inside out. A sore can start forming below the surface before any visible sign appears on the skin.
Who is most at risk
Anyone who spends extended hours in a wheelchair, armchair, or bed faces some level of risk. That risk is higher when mobility is limited, when skin is fragile from age or illness, when nutrition is poor, or when incontinence is a factor (moisture accelerates skin breakdown). Older Australians recovering from surgery or managing a neurological condition are among the most vulnerable.
Choosing the Right Cushion for Buttock Pressure Prevention
Gel and air-cell cushions outperform basic foam
Not all cushions are equal when it comes to pressure prevention. Basic foam cushions offer some comfort but limited protection against sustained pressure. Gel cushions and air-cell (alternating pressure) cushions are the two types with the strongest evidence behind them for preventing pressure sores.
Gel cushions use a viscous gel layer that flows and moulds around your body's contours, spreading the load across a wider surface. Air-cell cushions use a series of interconnected air chambers that can be adjusted to your weight and shape. Both types are available in our wheelchair cushion collection.
Contoured foam cushions shaped to follow the body (with a raised rear and lowered seat pan) also reduce pressure at the sit bones better than flat foam, making them a practical, cost-effective middle-ground option.
What immersion and envelopment actually mean
When comparing cushions, you may come across the terms "immersion" and "envelopment" in product descriptions. They are worth understanding. Immersion is how far your sit bones sink into the cushion surface. The deeper the sit bones sit within the cushion, the more the load is distributed across the thighs and buttocks. Envelopment refers to how well the cushion wraps around and accommodates your body's irregular shape.
A cushion that scores well on both counts will distribute weight more evenly and reduce peak pressure at any one point. In practical terms, a good cushion should feel like it is cradling you, not just sitting beneath you.
Prevention vs treatment: understanding the difference
This guide focuses on prevention: keeping healthy skin healthy for people who are at risk. A prevention cushion is designed to redistribute pressure before a sore develops. A treatment cushion (sometimes called a therapeutic or wound care cushion) is designed to offload a specific area where a sore has already formed and is healing.
If a pressure sore is already present, a treatment-focused approach is needed alongside wound care from a GP or nurse. A prevention cushion alone is not sufficient once the skin has broken down. For background on what pressure sores are and how they are staged, see our post on preventing pressure ulcers with wheelchair cushions.
Beyond the Cushion: What Else Prevents Pressure Sores
Repositioning and the 15-minute rule
Even the best cushion cannot prevent pressure sores on its own. Regular repositioning is essential. For anyone who is seated, the goal is a small weight shift every 15 minutes: lean to one side, lift slightly, or tilt the pelvis briefly. A full change of position (standing, lying down, or moving to a different chair) is recommended every two hours.
If you cannot reposition yourself, a carer or family member should assist. If this is difficult to manage consistently, speak with an occupational therapist about positioning aids, tilt-in-space seating, or powered repositioning systems that can help.
Daily skin checks: what to look for
Checking the skin once or twice a day is one of the most effective early interventions. You are looking for these warning signs:
- Non-blanching redness: Press a finger briefly on a red area. If the colour does not fade (blanch) under pressure and return when you release, blood flow to that area is already compromised.
- Warmth: Skin that feels warmer than the surrounding area can indicate early tissue damage beneath the surface.
- Discolouration on darker skin tones: Redness is harder to detect on darker skin. Look instead for purple, blue, or grey patches, or areas that feel firmer, softer, or warmer than usual. A torch held at an angle can help.
- Hardness or swelling: Any unusual firmness or puffiness around the sit bones, sacrum, or tailbone.
If any of these signs are present, relieve pressure from that area immediately and do not massage the skin (this can worsen damage). Contact a GP or nurse promptly.
Warning signs that something is not working
If redness or skin changes keep reappearing despite using a cushion and repositioning regularly, your current setup is not providing enough protection. This is a signal to review the whole picture, not just change the cushion.
Common reasons a cushion stops working include changes in body weight, a change in how long you are seated each day, or the cushion itself wearing out (foam cushions in particular lose their pressure-distributing properties over time). An occupational therapist can assess seating posture, cushion fit, and overall pressure management as a whole. A GP should also be consulted if skin integrity is deteriorating.
Browse our full range of pressure cushions, including gel, air-cell, and contoured options, to find the right fit. If you are not sure where to start, we recommend speaking with your healthcare provider about a formal seating assessment before you buy.