Saturday, December 26, 2009

Floor Reaction Orthosis


 Revolutionary orthoses: Custom fabricated, moulded plastic device that supports the ankle and foot area of the body and extends from below the knee down to and including the foot.

It was described by Saltiel for the use of weak quadriceps or plantar flexors in 1969

 It holds the ankle in equinus to prevent the heel from touching the ground. As the body weight brings the heel downwards, the suprapatellar band will press the knee back preventing knee from buckling during stance phase
 It allows the knee to flex during swing phase when the foot is off the ground

 It can be used in lower limb paralyses with weak quadriceps like post polio residual paralysis

Advantages over other AK Orthosis:
 Light weight-300gms
 Swing phase is not laboured
 Floor reaction prevents knee from buckling
 2 weeks training is enough to use it.
 Stabilises knee without muscle action
 Ground clearance is easier
 Good patient compliance
 Cosmetically acceptable-can be worn under shoe

 Must be correct fitting or else it wont function
 Has to be custom made


  1. disadvantage-upper end of this orthosis projects anteriorly when knee flexes and thus gives abnormal appearance.

  2. The FRO is designed to lock the ankle and to provide maximum resistance to ankle dorsiflexion.

    It is a stance phase control orthosis.

    Indication- Management of a crouch gait, which is characterized by excessive ankle dorsiflexion, increased knee flexion, and increased hip flexion in midstance.

    Contraindications - Hip flexion contracture
    Knee flexion contracture
    >20°, and a
    Thigh-foot angle
    > 15° external.

    Ref: J Am Acad Orthop Surg 2007;15:178-188