04/04/2026
Understanding Bottoming Out in Patient Positioning.
When supporting a patient during surgery or extended care, one critical risk that must be avoided is bottoming out.
Bottoming out occurs when a bony prominence pushes through the support surface, causing the patient’s body to rest directly on the hard surface beneath the mattress or positioner.
When this happens, protective cushioning is lost, and pressure can increase dramatically.
Why Bottoming Out is Dangerous
Clinical research shows that when bottoming out occurs, peak interface pressures can rapidly exceed 100 mmHg. At these levels, blood flow to the tissue can be restricted, potentially leading to skin breakdown and pressure injuries within hours.
Patients who are thin, frail, or have prominent bony structures are particularly vulnerable.
The Importance of Proper Support
If a positioning surface is too thin or does not provide sufficient ergonomic support, bottoming out may occur directly under the bony prominence.
Effective patient positioning solutions must therefore:
✔ Maintain sufficient material thickness
✔ Provide ergonomic contouring around the body
✔ Distribute weight across a wider support area
✔ Prevent direct contact with hard surfaces beneath the support layer
Protecting Patients Through Better Positioning
Preventing bottoming out is a critical part of pressure injury prevention in surgical and clinical environments. By using positioning systems designed to maintain proper support under load, healthcare teams can significantly reduce the risk of dangerous pressure spikes.
📊 In our accompanying visuals, we demonstrate how bottoming out occurs and how properly designed positioning surfaces help prevent it.
🔗 Learn more about pressure management and patient positioning solutions on our blog:
https://vascocare.com/blog/preventing-bottoming-out-a-critical-factor-in-patient-positioning]
💬 How does your facility manage pressure risks during long procedures?
