Anatomical Concepts (UK)
Masters of Rehabilitation Engineering






The sophisticated DDA™ (Dynamic Dorsi-Assist) Orthosis is designed to dynamically stretch the gastroc muscles, offsetting equinus contracture. The use of a series of posterior articulations allows for a virtually unrestricted range of plantar or dorsiflexion. The DDA™ Orthosis also provides nearly unlimited inversion or eversion of the ankle/foot complex.

The DDA™ Orthosis incorporates two elastic straps attached to the distal foot section and proximal calf section. These straps can be adjusted to compensate and/or offset varus and valgus tendencies while maintaining constant dorsi-assistive force. The DDA™ Orthosis incorporates an important telescoping calf section feature that allows for shortening or lengthening of the soft tissue/musculature.  This feature can also be locked out, if applicable.

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  • Immediate fit, early Intervention in acute or sub acute rehabilitation of the patient
  • CVA, TBI, SCI and Diabetic neuropathy
  • Facilitation of functional knee and ankle joint position through flexibility of the aluminium posterior upright structure
  • Allows for optimal dorsi/plantar flexion ankle positioning to provide adequate clearance during swing phase and knee stability in stance phase.
  • Post musculoskeletal injury of the foot and ankle
  • Post tendo achilles lengthening immobilisation
  • Post Botox or serial casting
  • Stable fractures of the foot and ankle
  • Tendon or ligamentous tear/rupture


  • Maintains constant dorsi-assistive force Clinically proven for effective ambulation*
  • Infinite sagittal plane adjustability
  • Proven superior integrity of the superstructure**
  • Available in Adult, Paediatric and infant versions
  • Available in Adult, Paediatric and Infant sizes

Adult - DDA Ankle Foot Orthosis

  • Foot length - 6.75 to 12 (inches)
  • Calf height - 12 to 13 (inches)
  • Calf Circumference - 20 (inches)
  • Calf Width - 4 (inches)
  • Foot Plate Width - 3.75 (inches)
  • Weight Limit - 250 (lbs)

This Video showcases the movement and adjustment possibilities of the DDA Ankle Foot Orthosis