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What is Blount's Disease (Tibia Vara)? Bowleg Treatment in Children
Dear parents, we completely understand the anxiety you feel when you notice your child walking with a "bowleg" (genu varum) posture. The vast majority of leg bowing seen in children up to age 2 is entirely "physiologic," meaning it is a natural and temporary part of development. However, as pediatric orthopedic experts at DMN Orthospine Clinic in Istanbul, we want to clarify that not all bowing is the same. Unlike physiologic bowing, which resolves on its own, Blount's Disease is a progressive condition caused by damage to the growth plate in the shinbone.
What is Blount's Disease? (The Brake Mechanism)
At the ends of a child's bones are areas of developing cartilage tissue called "growth plates" (physis). Blount's disease occurs when the inner (medial) part of the growth plate at the top of the shinbone (tibia), just below the knee, is damaged due to abnormal mechanical stress.
We can compare this to a simple "brake mechanism": Normally, both sides of the bone grow at an equal rate. In Blount's disease, the inner part of the growth plate slows down or stops—acting like a brake. Meanwhile, the outer (lateral) part continues to grow normally. When one side grows and the other stops, the leg naturally begins to curve outward in an "O" shape.
Two Types: Infantile and Adolescent
- Infantile Type (Early-Onset): Usually noticed around 1 to 3 years of age, affecting both legs in 50% to 80% of cases. The biggest risk factor is early walking in overweight babies. This heavy mechanical load damages the immature growth plate.
- Adolescent Type (Late-Onset): Typically emerges after age 10 and frequently affects only one leg. It is closely associated with rapid growth spurts during puberty and, very strongly, with obesity.
Physiologic (natural) bowing naturally corrects itself around age 2 as the child walks and muscles strengthen. Blount's disease, conversely, worsens over time. At our clinic, we make this crucial distinction using X-rays to measure the Drennan Metaphyseal-Diaphyseal Angle (MDA).
If the angle is below 10 degrees, it is likely physiologic. If it is above 16 degrees, it is highly likely to be Blount's disease, requiring immediate professional medical intervention.
Modern Treatment Approaches at DMN Orthospine
Led by board-certified surgeons Dr. Sedat Duman and Dr. Muhammed Duman, our clinic applies the most advanced pediatric orthopedic protocols based on the disease's stage.
1. Bracing (KAFO)
In early-diagnosed infantile types (especially under age 3), the first step is often specialized leg braces (Knee-Ankle-Foot Orthosis). These braces redirect the weight-bearing forces away from the inner part of the leg, allowing the growth plate to recover.
2. Guided Growth (The Eight-Plate Method)
This is one of the greatest revolutions in modern pediatric orthopedics. A small metal plate resembling the number 8 is attached to the fast-growing outer side of the bone. This "Minimally Invasive" technique temporarily slows down the outer growth, allowing the diseased inner side to catch up and straighten the leg naturally. Once corrected, the plate is simply removed.
3. Osteotomy (Corrective Bone Surgery)
This is the gold standard for advanced cases or adolescents who have reached the end of their growth potential. The shinbone is carefully cut below the knee, realigned to a perfect mechanical axis, and secured with titanium plates and screws or external fixators.
Frequently Asked Questions (FAQ)
Does early walking cause bowlegs in my child?
Yes, but only under certain conditions. If your child is overweight for their age and started walking before 10-12 months, their soft cartilage cannot bear the heavy load, which can damage the growth plate and trigger Blount's disease.
Is Rickets the same as Blount's disease?
Absolutely not. Rickets is a metabolic disease caused by Vitamin D or calcium deficiency affecting all bones. Blount's disease is localized mechanical damage strictly to the growth plate of the knee. Blood tests and X-rays easily differentiate the two.
Are Eight-plates permanent?
No, they are not permanent. The greatest advantage of the Eight-plate system is that it is reversible. Once the leg is completely straight, these small plates are removed with a minor procedure, and the bone resumes its natural growth.
What happens if Blount's disease is left untreated?
It does not resolve on its own. Untreated, the bowing worsens, leading to severe early-onset knee arthritis (osteoarthritis), meniscus tears, and permanent gait abnormalities (limping) in young adulthood. Early intervention is vital to save the joint.
Do not leave your child's leg development to chance. For an accurate diagnosis and modern treatment methods in Istanbul, you can schedule a consultation with our expert orthopedic surgeons at DMN Orthospine Clinic.