The chest strap on a backboard should be applied before the head is secured. In the standard immobilization sequence, you secure the torso first (chest, then hips and legs), and only then immobilize the head. This order exists for a specific reason: if the patient vomits or you need to tilt the board, a secured torso without a secured head still allows some protective movement. A secured head without a secured torso could allow the body to shift while the head stays fixed, potentially worsening a spinal injury.
The Standard Strap Sequence
Once a patient has been log-rolled onto the long spine board and centered, the strapping follows a top-to-bottom torso sequence before moving to the head:
- Chest strap first. The strap crosses the upper torso, typically at the level of the armpits or just below. It should be snug enough to prevent lateral sliding but not so tight that it restricts breathing.
- Hip and thigh straps next. These secure the pelvis and upper legs to limit any axial (up-and-down) movement on the board.
- Head immobilization last. Foam blocks, rolled towels, or a commercial head immobilization device are placed on either side of the head. Tape or straps then cross the forehead and are secured to the board’s edges.
After the head is secured, all straps should be rechecked. This sequence is consistent across protocols published by state EMS authorities, including Virginia’s Department of Health and Michigan’s Macomb County EMS Medical Control Authority, both of which specify torso straps before head immobilization.
Why the Chest Strap Comes Before the Head
The logic is simple: you want the largest, heaviest part of the body locked down before you fix the most vulnerable part. If the head were strapped first and the torso shifted during transport or a board tilt, the resulting movement could twist or flex the cervical spine. By anchoring the chest and pelvis first, you create a stable platform so that when the head is finally secured, everything moves as one unit.
There’s also a practical safety concern. If a patient vomits while fully immobilized, rescuers tilt the entire board to the side to clear the airway. A secured torso keeps the patient from sliding off during this maneuver. If only the head were strapped, the body could shift laterally while the head stays pinned, a dangerous combination.
How Tight Is Too Tight
The chest strap needs to prevent movement, but overtightening creates real breathing problems. Research on chest wall compression shows that strapping across the ribcage can reduce vital capacity (the maximum amount of air a person can exhale after a full breath) by roughly 41% on average, with some studies measuring reductions as high as 50%. The ability to push air out at the end of a normal breath drops even more, averaging a 51% decrease.
These numbers come from controlled experiments with tight binding, not standard EMS strapping, but they illustrate why fit matters. A strap that’s cranked down hard enough to visibly compress the chest can meaningfully limit how much air your patient moves with each breath. The goal is firm contact that prevents sliding, not compression that restricts rib expansion. You should be able to slide a flat hand between the strap and the chest without much effort.
Modifications for Pregnant Patients
For patients in the second half of pregnancy, the standard flat-on-the-back position creates a serious problem. The weight of the uterus compresses the large vein that returns blood to the heart, which can drop blood pressure and reduce blood flow to both the patient and the fetus. To prevent this, the board itself is tilted 15 to 30 degrees to the left, or a wedge is placed under the right hip to elevate it 10 to 15 centimeters.
The strap sequence stays the same (chest, hips, then head), but straps may need slight repositioning to accommodate the tilt and the changed body contour. The chest strap in particular should sit high enough to avoid pressing on the abdomen.
Modifications for Children
Children have proportionally larger heads relative to their bodies, which changes how they sit on a standard backboard. On a flat board, a child’s large occiput (the back of the skull) can push the head forward into flexion, potentially compromising the airway or worsening a cervical injury. Padding under the torso, from the shoulders to the pelvis, brings the body up to the level of the head and keeps the spine neutral.
The strap order remains the same, but adult-sized straps are too wide and too long for pediatric patients. Purpose-built pediatric immobilization straps exist for this reason. Improvising with tape or bandages is less reliable and takes longer, which matters when you’re managing a scared child who may not hold still.
The Shift Toward Spinal Motion Restriction
It’s worth knowing that backboard use in EMS is declining. A 2024 update to the Wilderness Medical Society’s clinical practice guidelines, along with joint position statements from the American College of Surgeons, the American College of Emergency Physicians, and the National Association of EMS Physicians, now advocate for “spinal motion restriction” rather than traditional rigid immobilization. The shift is toward goal-oriented care (protecting the spinal cord) rather than technique-oriented care (strapping everyone to a board).
In practice, this means many EMS systems now use backboards primarily as transfer devices to move patients, then remove them once the patient is on a stretcher. Long transport on a rigid board causes pain, pressure injuries, and breathing difficulty without strong evidence of better spinal outcomes. Still, backboard immobilization remains part of EMT training curricula and is used in specific scenarios like extrication from vehicles or unstable scenes where full-body stabilization is needed. When you do use one, the sequence hasn’t changed: chest first, head last.