Anatomical Concepts (UK)
Masters of Rehabilitation Engineering

Blounts Orthosis

Paediatric KAFO for Blounts and other Knee Conditions

Radiographic appearance in early-onset Blounts disease

Radiographic appearance in early-onset Blounts disease

what is blounts disease?

Blount’s disease is sometimes known as Tibia Vara, or Osteochondrosis Deformans Tibiae. This is a growth disorder of the shin bone (tibia) characterised by inward turning of the lower leg (bowing) that slowly worsens over time. While it is not uncommon for young children to have bowed legs, typically the bowing improves with age.

Custom Blounts Orthosis

There are two types of Blount disease (early-onset and late-onset), based on whether symptoms begin before or after four years of age. Blount disease may occur in one or both legs and can lead to shortening of the affected leg and other changes within the bones of the legs. Bowing of the shinbone from just below the knee to the ankle is the most common symptom. This is the result of stress placed on the growth plate at the top of the tibia, causing the bone to slow down or stop maturing on the inside of the leg while the outside part continues to grow. The growth plate, also known as the epiphyseal plate, is made of cartilage (weaker than bone) and is the area of growing tissue near the ends of the long bones in children and adolescents who haven’t reached skeletal maturity. The uneven bone growth causes the tibia to bend outward instead of growing straight.

The cause of Blount disease is not well understood; however, a variety of hereditary and genetic factors are likely involved. The condition is more common among certain populations and is associated with obesity and early walking. Treatment may involve conservative orthotic management and/or surgery

A child may not feel any pain at all, but adults could experience discomfort on the side of the knee joint and down the inside of the leg. For children, the biggest impact of Blount’s disease is through walking as one may limp or frequently trip. Regardless of age, if not treated, this condition will lead to progressive deformity.

The Blounts orthosis incorporates the Unique V-VAS joint to apply and control a gentle corrective force

The Blounts KAFO can be configured in a variety of ways


A physician will prescribe a HKAFO (hip-knee-ankle-foot orthosis) or a KAFO (knee-ankle-foot orthosis) to help redistribute the forces on the growth plate to establish normal maturity.

The brace must be worn for roughly one to two years to see changes in the shape of the shinbone. If there is no sign of improvement within the first 12 months, then surgery will be recommended.

Our Blount's orthosis is a unique KAFO custom fabricated for your youngest patients with Blount's disease or other conditions affecting the alignment of the lower legs. The orthosis uses the dynamic V-VAS™ joint system and allows for sequential correction of the deformity and accommodates growth. Patient compliance is not an issue due to the auto-aligning, free motion polycentric knee joint capabilities that have the ability to isolate measured tibio-femoral alignment in 2 and 4 degree increments.

It is the only system that creates a correction force throughout the full range of knee motion.

The KAFO design is adaptable to incorporate a medial or lateral step lock or drop lock joint opposite the V-VAS™ joint to simplify straightening adjustment and increase knee stability if this is needed.

Correction force through all ranges or motion and activities

Correction force through all ranges or motion and activities


This is a Custom Orthosis made to a cast of the patient’s limbs. Please contact us for Casting and Measurement Guidelines amd Pricing. (UK Clients and Orthotists Enquiries only)

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  • Non-surgical treatment of Blounts, Rickets, Bow leg, knocked knee and other bowing deformities

  • Treatment of the tibia vara and genu varum (bowleg) in infant and juvenile patients

  • Treatment of Infant and Late Onset Blounts Disease

  • Joint laxity

  • Post tibial osteotomy or hemi-epiphysiodesis

  • New alternative to traditional designs for optimal outcomes*

Features of the Blounts Paediatric KAFO with V-VAS Joint

  • Free motion, dynamic self-aligning V-VAS polycentric joint system

  • Accommodates growth and

  • Allows adjustment of corrective forces

  • Posterior open design

  • Design significantly reduces fitting and follow up time

  • Additional padding for accommodation of circumferential growth

  • Isolated tibia vara correction

  • Custom fabricated to cast impression

  • Colourful molded graphics

  • Clinically proven to be effective for non resolving bowing deformities

  • Independent adjustment of the tibial and femoral angles for proven outcomes

  • Posterior or anterior opening
    Also available for your Adult and Bariatric patients