Tuesday, 15 November 2011

Research: Ankle Orthoses to aid walking

Bregman DJ, Harlaar J, Meskers CG, de Groot V.Spring-like Ankle Foot Orthoses reduce the energy cost of walking by taking over ankle work. Gait Posture. 2011 Nov [Epub]


Background: In patients with central neurological disorders, gait is often limited by a reduced ability to push off with the ankle. To overcome this reduced ankle push-off, energy-storing, spring-like carbon-composite Ankle Foot Orthoses (AFO) can be prescribed. It is expected that the energy returned by the AFO in late stance will support ankle push-off, and reduce the energy cost of walking.


Methods: In 10 patients with multiple sclerosis and stroke the energy cost of walking, 3 dimentional kinematics, joint power, and joint work were measured during gait, with and without the AFO. The mechanical characteristics of the AFO were measured separately, and used to calculate the contribution of the AFO to the ankle kinetics.


Results: We found a significant decrease of 9.8% in energy cost of walking when walking with the AFO. With the AFO, the range of motion of the ankle was reduced by 12.3°, and the net work around the ankle was reduced by 29%. The total net work in the affected leg remained unchanged. The AFO accounted for 60% of the positive ankle work, which reduced the total amount of work performed by the leg by 11.1% when walking with the AFO.


Conclusions: The decrease in energy cost when walking with a spring-like energy-storing AFO in central neurological patients is not induced by an augmented net ankle push-off, but by the AFO partially taking over ankle work.


"A ankle foot orthoses may reduce the energy required for walking"

1 comment:

  1. Sounds like it could be helpful - I have found footwear and whether it has some bounce can make the differences between walking okish and walking pretty badly!

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