Understanding Pressure Sores: What They Are and Why Prevention Matters
Pressure sores, also called pressure ulcers or bedsores, are injuries to the skin and underlying tissue caused by prolonged pressure on the skin. They typically develop on areas of the body where bones are close to the skin surface, such as the heels, tailbone, hips, shoulders, and elbows. When pressure restricts blood flow to these areas for extended periods, the skin and tissue beneath can break down, leading to open wounds that may become infected.
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According to the National Pressure Injury Advisory Panel, pressure sores affect between 2.5 million and 3.3 million people in the United States each year. In hospital settings, approximately 1 in 10 patients develop a pressure injury. The condition is particularly common among older adults and individuals with limited mobility, spinal cord injuries, or certain chronic health conditions. Research shows that pressure sores can take weeks or months to heal, and in severe cases, they may require surgical intervention.
The economic burden of pressure sores is significant. Medicare data indicates that treating a single pressure ulcer can cost between $2,000 and $30,000 depending on severity, and complications from pressure injuries add billions to healthcare costs annually. Beyond financial impact, pressure sores cause considerable pain, reduce quality of life, and increase the risk of serious infections like sepsis.
Understanding how pressure sores develop is the foundation of prevention. When a person remains in one position for too long, the weight of their body compresses soft tissues between the bone and the surface they're resting on—whether that's a bed, wheelchair, or chair. This compression reduces blood flow to the area. Without adequate blood circulation, cells cannot receive oxygen and nutrients, leading to cell death and tissue breakdown. The process can begin in as little as 2 to 3 hours of continuous pressure, though some individuals may be affected sooner depending on their skin condition and overall health.
Practical Takeaway: Recognize that pressure sores are preventable through consistent action. They develop gradually, which means early intervention and regular monitoring can stop them before they become serious problems. Anyone with reduced mobility, whether temporary or permanent, should understand their personal risk factors.
Identifying Risk Factors and Assessing Your Personal Risk
Certain conditions and circumstances significantly increase the likelihood of developing pressure sores. Age is one factor—adults over 70 have thinner skin with less natural padding, making tissue damage more likely. However, pressure sores can develop at any age in people with risk factors. Mobility limitations represent perhaps the most critical risk factor. Individuals who are bedridden, confined to wheelchairs, or have difficulty changing positions without help face substantially higher risk than those who can move freely.
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Medical conditions that impair sensation, such as spinal cord injury or diabetes-related neuropathy, create danger because people may not feel pain that signals they need to change position. Similarly, conditions affecting circulation—including heart disease, diabetes, and peripheral vascular disease—mean less blood reaches the skin, making it more vulnerable to breakdown. Incontinence and moisture on the skin increase risk by softening the skin and making it more fragile. Poor nutrition, particularly insufficient protein intake, slows wound healing and weakens skin integrity. Dehydration reduces skin elasticity and blood volume, impairing the body's ability to maintain healthy tissue.
The Braden Scale is a widely used tool that healthcare providers use to assess pressure sore risk. It evaluates six factors: sensory perception, skin moisture, activity level, mobility, nutritional intake, and friction/shear. Healthcare providers assign scores in each category, and individuals with lower total scores face higher risk. Many hospitals and care facilities use this or similar assessment tools routinely. While you don't need specialized training to understand risk factors, learning which ones apply to your situation helps direct prevention efforts.
People recovering from surgery face temporary but significant risk. Post-operative patients often spend extended time in bed while pain and medications limit movement. Individuals with severe infections, significant burns, or traumatic injuries similarly face elevated risk during recovery. Even temporary situations—such as a broken leg requiring bed rest or a hospital stay for another condition—create windows of vulnerability that warrant preventive measures.
Practical Takeaway: Write down which risk factors apply to your situation or that of someone in your care. Share this information with healthcare providers, as it helps them recommend appropriate prevention strategies tailored to individual circumstances. Risk assessment should be ongoing; as conditions change, so too should prevention approaches.
Repositioning and Movement: The Foundation of Prevention
Repositioning—changing body position at regular intervals—stands as the single most effective prevention strategy for pressure sores. The principle is straightforward: by moving or adjusting position frequently, you prevent any one area of the body from enduring continuous pressure. For individuals who can move independently, getting up and changing position every 15 to 30 minutes during waking hours provides substantial protection. Those confined to wheelchairs should shift their weight every 15 to 20 minutes—this can be done by lifting oneself slightly using armrests, leaning forward, or tilting the chair.
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For bedridden individuals, repositioning typically occurs every 2 to 4 hours, though some people with very high risk may need more frequent changes. Standard repositioning patterns include moving from lying on the back to the left side, then to the right side, and back. Some facilities use turning schedules posted at the bedside to ensure consistency across different caregivers. The specific schedule should account for individual factors—skin condition, medical status, and comfort levels—rather than applying a one-size-fits-all approach.
Proper technique matters when repositioning. Dragging or sliding a person across sheets creates friction and shear forces that damage skin. Instead, caregivers should use lifting techniques or sliding sheets to move people smoothly without dragging. When positioning someone on their side, place pillows between the knees and under the top leg to prevent bone-on-bone contact, which concentrates pressure in small areas. Similarly, use pillows to support the head and ensure the body maintains proper alignment, reducing strain on particular areas.
For those able to engage in some physical activity, regular movement provides multiple benefits beyond pressure relief. Exercise improves circulation, strengthens muscles that support movement, and enhances overall health. Even light activity—such as range-of-motion exercises performed by a caregiver for someone with limited mobility—keeps joints flexible and maintains some muscle tone. Walking, wheelchair propulsion, or other forms of activity adapted to ability level should be incorporated into daily routines whenever possible.
Practical Takeaway: Establish a repositioning schedule and post it visibly if multiple caregivers are involved. Set phone reminders or alarms if caring for someone independently. Document position changes and note any areas of redness or skin changes observed during repositioning, as this information helps identify problems early.
Using Supportive Surfaces and Pressure-Relief Equipment
Specialized surfaces and equipment reduce pressure on vulnerable areas by distributing weight more evenly across a larger surface. These tools support but do not replace repositioning—they work most effectively in combination with regular position changes. Understanding the options available helps in selecting appropriate equipment for different situations.
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Mattress overlays and replacement mattresses represent the most common pressure-relief surfaces. Standard foam mattresses concentrate pressure on small contact points; pressure-reducing mattresses distribute pressure more evenly. High-density foam, gel overlays, and air-filled systems each offer different benefits. Foam overlays are affordable and portable but offer moderate pressure relief. Gel overlays provide excellent comfort and pressure distribution but are heavier and less portable. Air mattresses and dynamic systems that inflate and deflate in patterns can provide superior pressure relief, though they require electricity and more maintenance.
Wheelchair cushions similarly vary in design and function. Foam cushions offer basic pressure relief at lower cost. Gel and foam combination cushions provide better contouring. Air cushions or high-tech systems distribute pressure more effectively but cost more and require monitoring. The right cushion depends on weight, body shape, activity level, and how much time the person spends in the wheelchair. Someone in a wheelchair for most of the day benefits from more sophisticated pressure-relief cushions than someone who spends brief periods in a chair.
Pillows and positioning aids prevent pressure injuries by supporting proper positioning. Placing pillows between bony areas—knees, ankles, elbows—prevents these bones from pressing against each other or against surfaces. Donut-shaped cushions, however, are generally discouraged by medical professionals because they can actually increase pressure around the edges of the