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As a new clinician, I remember being quite shocked when I encountered groin harnesses (also called anti-thrust harnesses—straps positioned between the legs) being used to keep children upright in their seats. The approach felt undignified and uncomfortable. Yet, faced with overburdened, and in hindsight poorly trained, therapists and care teams, I accepted them as a regrettable necessity.
Over time, through experience in supportive seating and learning alongside skilled professionals, my perspective has shifted. I now believe groin harnesses are not the right solution for preventing forward sliding and should be phased out in favour of more effective strategies.
Why Are Groin Harnesses Used?
Some children with uncontrolled movements, atypical muscle tone, or poor postural control may slide forward in their seats despite careful setup and adjustments. This can result in unsafe positioning or even sliding completely out of the seat. Groin harnesses aim to prevent this but they often introduce new problems: discomfort, a stable but poor posture, and loss of dignity. Moreover, they treat the symptoms rather than addressing the root cause.
Pause to read Akpeil's case story, a teen with complex needs and very limited access to postural management or therapeutic intervention. With the BeMe Advanced Seating System, and removal of an ineffective groin harness, Akpeil could thrive as a bright sociable young person.
Instead of relying on a physical restraint, we should prioritise improved postural assessment and tailored seating modifications that create a stable, functional, and dignified position. Here’s why I advocate against groin harnesses—and what you can do instead.
1. They Treat Symptoms, Not the Cause
Forward sliding is a symptom of underlying biomechanical or postural challenges—tight muscles, abnormal movement patterns, poorly configured seat angles, or inadequate pelvic support. A groin harness doesn’t address these issues; it merely contains the body against their biomechanics.
2. They Are Uncomfortable
Groin harnesses place pressure on the inner thighs and groin, often resulting in discomfort, pain, and skin irritation. This is particularly problematic for individuals with sensory sensitivities, spasticity, or fragile skin, potentially worsening involuntary movements or leading to pressure injuries.
3. They Compromise Dignity
Any seating solution should preserve a person’s dignity. A groin harness draws unwanted attention to an object in the pelvic region and may feel humiliating or invasive. Even if they initially sit on top of the thigh, the child inevitably slides until they are at the groin region.
4. They Mask Underlying Postural Problems
Sliding often occurs because the child’s muscles are being held at the end of their range. Muscles work most efficiently mid-range, and the body instinctively seeks to shift to this mid-range position - we all do. A groin harness forces the body into an uncomfortable position instead of addressing the biomechanical cause—such as hip flexor tightness, hamstring length, or seat angle.
5. Sitting at the End of Hip Flexion Range Is Not Sustainable
If a child has limited hip flexion, forcing them to sit at the extremes of their range causes discomfort and promotes instability. Instead of imposing artificial posture, seating should accommodate their natural alignment and flexibility.
Alternative Strategies for Preventing Sliding
Instead of using groin or anti-thrust harnesses, consider the following evidence-informed alternatives. A combination tailored to the needs of each child is typically required:
1. Use a Ramped Cushion
Unlike a simple wedge-shaped cushion, a ramped cushion supports the femurs and thighs in a horizontal position while allowing the pelvis to remain neutral orientation. This stabilizes the pelvis and reduces the tendency to slide forward.
2. Add an Ischial Shelf
A cushion with a deep ischial well creates a secure space for the ischial tuberosities (ITs) and an anterior shelf to prevent them from migrating forward.
3. Adjust the Seat-to-Back Angle
For individuals with reduced hip flexion, increasing the seat-to-back angle can ease muscle tension. Combine this with tilt-in-space functionality to reduce sliding while maintaining comfort.
4. Ensure Proper Foot Positioning
Poor foot positioning—especially when footrests are too far forward—can stretch shortened hamstrings and pull the pelvis into posterior tilt. Position foot supports directly under or slightly behind the knees to reduce this strain and promote upright posture.
5. Consider Custom Seating Solutions
If standard options are inadequate, a custom-molded seat or backrest may provide the necessary support. Contoured shapes can maximize surface contact, improving stability while minimizing pressure on vulnerable areas.
6. Optimize Pelvic Belt Position and Tension
Use a pelvic belt positioned with a downward angle over the thighs (not horizontally across the waist). This offers secure pelvic positioning without the discomfort of a groin strap. Educate staff on how and why to use it correctly.
Addressing Common Counterarguments
“Groin harnesses are necessary for safety.”
Safety is essential, but groin harnesses often create new risks—discomfort, pressure injuries, and poor circulation. Safer, more comfortable alternatives exist, such as tilt-in-space seating and pelvic support strategies.
“They help keep the person in the right position.”
Effective positioning should support—not restrain—the body. If a child needs a groin harness to stay upright, their seating setup is not meeting their physical needs.
“They’re the easiest solution.”
Quick fixes can cause long-term harm. Taking the time for a thorough postural assessment and tailored seating plan leads to better outcomes, both physically and emotionally.
“There’s no better alternative.”
This is simply not true. Multiple evidence-based options—ramped cushions, moulded seating, tilt functions, and properly placed pelvic belts—offer safer, more dignified, and more effective alternatives.
Conclusion
Groin harnesses (anti-thrust devices) are restrictive and ineffective long-term solutions. They fail to address the real causes of forward sliding and introduce new risks.
By focusing on assessment and postural alignment—especially in regard to hip flexion range, hamstring length, seat configuration, and foot positioning—we can build seating systems that support the body rather than fighting against it.
Let’s aim for solutions that prioritise posture, comfort and function.
