Ossur’s ‘AFO Dynamic’ Ankle-Foot Orthosis Sets New Performance Standard
By Mark Muller, CPO, CPed Ossur has now applied the advanced technology of Flex-Foot®
to a full line of orthoses.
At the forefront is the new AFO Dynamic ankle-foot orthosis,
made from the same pre-impregnated carbon fiber that gives
Flex-Foot some of its unique properties. The energy-storing
capacity and other properties of this carbon fiber material make it
ideal for orthotic devices, providing a strong, yet lightweight,
support system with remarkable performance, including its high
level of dynamic response and energy return.
The layering of the carbon fiber has been optimized through
extensive computer analysis and mechanical testing as part of the
continual refinement of Flex-Foot technology. Brought to the AFO
Dynamic, this layering helps to ensure that the deflection of the
forefoot from mid-stance to toe-off is proportional to the user's
weight and impact level. Because it incorporates Ossur's carbon
fiber technology, we believe that the AFO Dynamic is stronger and
more durable than other currently available products.
Gait Assistance
 The system also offers gait assistance through
gradual plantarflexion at initial contact and medial-lateral
stability at mid-stance. The carbon fiber technology provides
energy return and assistance for propulsion of the limb at toe-off.
Throughout swing phase, the foot is fully supported for optimal
ground clearance.
The footplate design of this new orthosis provides a stiffness
gradient that corresponds to the ground reaction forces as they are
applied to the foot. The response becomes stiffer when extra
support is needed and less stiff when conditions are milder.
Providing Strength, Visual Appeal
Efforts have been made to give the entire orthosis a pleasing
profile. A medial strut makes it less visible than other ankle-foot
orthoses and provides additional strength. It also prevents
excessive pronation by supporting the lower leg and preventing the
arch from collapsing. It has a simple strap mechanism for ease of
use and visual appeal. And there is an open structure on the
anterior tibia shell for stability without excess weight. A textile
cover on the outside of the unit and inside the footplate provides
an attractive appearance and protects the skin from contact with
fiber residues.
The AFO Dynamic is only the beginning of Ossur's commitment to
the research and development of new orthotic devices. We are
excited to be entering this new field.
For more information, call 800.233.6263 or visit www.ossur.com Mark Muller, CPO, CPed, is clinical prosthetist and orthotist at Ossur North America. 
Table Of Contents - March 2004
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