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Dynamic Rocker Back

Dynamic Rocker Back Interface (DRBi)

The Seating Dynamics Rocker Back Interface is installed between the seat and the back of a wheelchair and provides movement of the back to absorb forces and assist the client back to upright. This movement can protect both the client from injury and the seating system and mobility base from breakage. This movement can also reduce extension and provide movement to reduce agitation, increase alertness, and provide sensory input. Movement can also facilitate functional activities. Finally, movement against resistance in a limited range can increase trunk and head control.

Dynamic Rocker Back

Clinical Application

Tyler demonstrating dynamic back

The Dynamic Rocker Back moves posteriorly in response to client force and assists the client back to an upright starting position.

How does the ability to move affect equipment and the client?

  • Forces are absorbed and diffused, protecting both the client and the wheelchair frame and seating system from harm.
  • Extensor tone is diffused, reducing overall tone and posturing, increasing function, and conserving energy.
  • Movement is provided, which can increase sitting tolerance, decrease agitation, increase alertness, and even increase trunk control.

Benefits of Dynamic Rocker Back (DRBi)

Opens Seat to Back Angle in response to client movement and force
Pivot point follows the natural pivot point of the hip, maintaining the position of the pelvis upon return to upright
Provides Movement
Absorbs and Diffuses Force
Reduces Active Extension and Posturing
Protects Client from Injury
Protects Equipment from Breakage
Increases Sitting Tolerance
Decreases Agitation
Increases Alertness
Increases Trunk Control

Explore the Dynamic Rocker Back Interface

dynamic backrest motion
DRBI back latch
seating dynamics jig

In Their Words

“Seating Dynamics has excellent dynamic products that are compatible with many frames. In my experience, the dynamic back and footrests have prevented frame damage, allowed for extension of the client but with return of pelvis to effective sitting posture, reduced pressures on back, buttock and foot area, and reduced agitation on clients with SI issues.…

Missy Ball, PT, MT, ATP
PhysioBall Therapy, LLC
Metairie, LA

“Great products! I work with kids and adults with developmental disabilities. I’ve had lots of success with their dynamic rocker back interface to address high exterior tone, as well as rocking behavior!”

Macara McGregor
St. Amant, Winnipeg, Manitoba

“Faith has had the dynamic back for one year now and she loves it! It allows her to get the movement stimulation she so craves. She is happy when she can move.”

Faith’s Mom
Pollock Pines, CA

Watch Me Move

Phillip receives his Seating Dynamics components!

Phillip likes to move, but his current dynamic back was broken and his wheelchair did not incorporate other dynamic components. His forceful movements led to significant wheelchair damage.

Determining if a Dynamic Back is Appropriate

In general, if a client has moderate to significant hip extension, is seeking movement, and/or has a history of equipment breakage, a Dynamic Back may be appropriate. How do you determine if this intervention is appropriate without actually trying it?


Dynamic Rocker Back interface demonstration

This video demonstrates how the elastomer is compressed, absorbing forces, and then returns the back to upright.

Technical Information

The Dynamic Rocker Back interface is two self-contained suspension assemblies installed between each of the seat rails and the back canes of a wheelchair. The design incorporates both impact and rebound control using urethane elastomers. Each unit ships with a full set of four different elastomers to allow fine tuning to the individual user’s requirements.

DRBI elastomersResistance

The back is available with 4 different levels of resistance – the client should be able to move the back, yet still return to upright.

Pivot Point

The pivot point is such that the position of the pelvis is maintained upon return to upright.


The back can be latched to lock out this movement. It is our recommendation that the latch plate be in the UNLOCKED position at all times with several exceptions:

  1. When the wheelchair is being transported in a vehicle.
  2. When the wheelchair is being pushed by an attendant on a rough surface to reduce the risk of inducing spasms due to movement of the wheelchair.
  3. Some caregivers report that it has been helpful to latch the DRBi during feeding.

Degree of Movement

The seat to back angle opens approximately 10-15 degrees. This amount of movement leads to a minimal amount of shear, allowing the client to remain in alignment with the contours of the back.

Dynamic Rocker Back Resources

Seminar Watch Now

Free CEU: Introduction to Dynamic Seating for Wheelchairs

April 20, 2022

Join OT Michelle Lange for this Numotion hosted webinar on how Dynamic Seating provides movement within a wheelchair, and how this movement can lead to clinical benefits.

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Quick Class

Quick Class: Dynamic Seating – Addressing Shear

February 16, 2022

A primary goal of wheelchair seating and mobility is to reduce Shear forces. Does Dynamic Seating increase Shear? This quick class answers that question.

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seating dynamics blog video carl side by side view

Carl: A Side by Side View of Before and After Dynamic Back Installation

January 23, 2022

Before receiving a Dynamic Back, Carl was actually standing up in his power wheelchair due to unrelieved extensor tone. After receiving a Dynamic Back on his new power wheelchair, Carl is able to stay seated with his body in alignment with the support surfaces of the seating system.

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