Womens Health

BlountÕs Disease – types, causes, symptoms, diagnosis, prevention, treatments, and Home Remedies

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Blount disease: bowed legs, diagnosis and treatment

Table of Contents

Key takeaways

  • Blount disease is a growth disorder of the upper shin bone that causes progressive bowing of one or both legs.
  • Some bowing is normal in toddlers, but bowing that worsens, is one-sided, persists after early childhood or causes an abnormal gait needs assessment.
  • Diagnosis is usually made by examination and standing leg X-rays interpreted by paediatric orthopaedic specialists.
  • Treatment may include observation, bracing or surgery depending on age, severity, growth remaining and whether the deformity is progressing.

Overview

Blount disease, also called tibia vara, is a condition in which growth at the inner side of the upper tibia slows or becomes abnormal. The tibia is the shin bone. When the inner growth plate is affected, the leg can gradually angle outwards below the knee, creating a bowed-leg appearance.

This is not the same as ordinary toddler bowing, which often improves naturally as children grow. Blount disease tends to progress and may become more noticeable after a child starts walking. It can affect one leg or both legs and may be described as infantile or adolescent depending on age at onset.

Early recognition matters because the growth plate is still active in childhood. Some children can be managed with bracing if diagnosed early, while more advanced or later-presenting cases may need surgery to correct alignment and reduce future knee strain.

Symptoms

The main sign is bowed legs, especially bowing below the knee. Parents may notice that one leg looks more bowed than the other, that the child walks with the feet turned in, or that the knee shifts outward during weight-bearing. Pain is often not prominent in younger children, but older children and adolescents may report knee pain or tiredness with activity.

Other features can include internal rotation of the shin, a limp, uneven leg length, progressive deformity and difficulty fitting braces or shoes comfortably. In adolescent Blount disease, the bowing may be associated with higher body weight and may be one-sided.

Because normal leg alignment changes with age, the pattern over time is important. Bowing that worsens rather than improves, starts after earlier normal alignment, or is sharply angled at the upper shin is more concerning than mild symmetrical toddler bowing.

Causes and risk factors

The exact cause is multifactorial. Mechanical pressure across the inner upper tibial growth plate appears important. When compression is excessive, cartilage growth may slow on the inner side while the outer side continues to grow, gradually increasing the varus, or bow-legged, angle.

Risk factors described in medical literature include early walking, higher body weight, family or genetic susceptibility and ancestry-related patterns in some populations. Risk factors do not mean blame. The practical point is that children with progressive bowing should be assessed early so alignment and growth can be monitored.

Other conditions can mimic bowed legs, including nutritional rickets, skeletal dysplasias, previous growth plate injury, infection or metabolic bone disease. This is why diagnosis should not be made from appearance alone.

Diagnosis

A clinician will ask when bowing started, whether it is changing, whether one or both legs are affected, walking history, pain, falls, family history, growth and general health. Examination looks at hip, knee, ankle and foot alignment, gait, leg lengths and whether the knee shifts during walking.

Standing X-rays from hip to ankle can measure mechanical alignment and show changes at the upper tibial growth plate. Specialist measurements help distinguish physiological bowing from Blount disease and guide treatment. MRI may be used in selected cases to assess cartilage, growth plate and joint structures, especially when X-rays do not fully explain the clinical picture.

Blood tests may be considered if rickets, vitamin D deficiency or another metabolic bone problem is possible. Referral to paediatric orthopaedics is appropriate when bowing is persistent, progressive, asymmetric or associated with pain or gait concerns.

Families may be asked to bring earlier photos or videos because they can show whether alignment has improved, stayed the same or worsened. This timeline is useful: physiological bowing generally trends towards correction, while Blount disease may show progressive angulation, altered foot progression or a visible thrust at the knee during walking.

Treatment and management

Treatment depends on the child’s age, severity, X-ray stage and growth remaining. Early infantile cases may be treated with a knee-ankle-foot orthosis, a specialist brace that applies corrective force while the child grows. Bracing is most likely to help when started early and when the deformity is mild.

If bracing is unsuitable or ineffective, surgery may be discussed. Options can include guided growth, where growth is slowed on one side of the growth plate to allow gradual correction, or osteotomy, where the bone is cut and realigned. Some severe cases need gradual correction with an external frame.

Surgical decisions are individual and should include discussion of expected correction, recurrence risk, growth remaining, pain control, rehabilitation, possible complications and follow-up. Children may need repeated monitoring until skeletal maturity because alignment can change as they grow.

Follow-up appointments often include repeat clinical measurements and imaging. The aim is not only cosmetic straightening; it is to improve the mechanical axis through the hip, knee and ankle so that load is shared more evenly across the knee joint. Poor alignment can contribute to pain, abnormal gait and earlier joint wear if it remains significant.

Support at home

Home care cannot correct Blount disease, but families can support mobility and follow the treatment plan. Keep orthopaedic appointments, use braces as prescribed, tell the team if a brace causes skin damage, and encourage activity that is comfortable and appropriate for the child.

If weight management is part of the plan, it should be framed around health, strength and family habits rather than blame or restriction. A dietitian, physiotherapist or paediatric team can help if movement is limited by pain or confidence.

Children may also need practical support at nursery or school, such as time for appointments, help with brace routines, modified physical activity during recovery or reassurance about visible differences. Pain, teasing or reduced confidence should be raised with the clinical team, not treated as something the child simply has to tolerate.

When to seek medical advice

Ask a GP or health visitor for assessment if a child’s legs are becoming more bowed, bowing is one-sided, walking looks unstable, there is knee pain, the child limps, or bowing persists beyond the age when it would be expected to improve. Seek urgent advice for severe pain, inability to walk, fever, injury or a suddenly swollen painful joint. Use NHS 111 for urgent advice or call 999 in a life-threatening emergency.

Sources

Disclaimer

Educational only. Results vary. Not a cure.

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