Bow Legs In Singapore

If you or your child has legs that curve outward at the knees when standing with feet together, you may be dealing with bow legs, medically known as genu varum. This condition affects people of all ages and can range from a normal developmental stage in toddlers to a concerning issue requiring medical assessment in older children and adults. Our senior consultant orthopaedic surgeon specialises in diagnosing and treating bow legs using evidence-based approaches tailored to each patient’s specific needs and age group.

Dr Zackary Chua

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (Aus)MMed (SG)MRCS (Glasgow)FRCSEd (Orth)

Types Causes & Risks Symptoms When to see a Doctor Diagnosis Treatment Complications Prevention FAQ Conclusion

What is Bow Legs (Genu Varum)?

Bow legs is a condition where the knees stay wide apart even when the ankles are together, creating a distinctive bowed appearance of the lower limbs. The medical term “genu varum” describes this outward angulation of the knee joint. While some degree of bowing is normal in infants and toddlers up to age two, persistent or progressive bowing beyond this age may indicate an underlying condition requiring medical evaluation.

Types of Bow Legs

Physiological Bow Legs

This is the most common type seen in infants and toddlers under two years old. It represents a normal variation in leg development that generally improves without treatment as the child grows. The bowing is usually symmetrical and mild, affecting both legs equally.

Pathological Bow Legs

This type usually persist beyond age two or develops later in life due to underlying medical conditions. Pathological bow legs may be asymmetrical, progressive, or associated with other symptoms. Clinical evaluation may help identify the underlying cause.

Blount’s Disease

A specific growth disorder affecting the inner part of the shinbone (tibia) near the knee. It can occur in young children (infantile type) or adolescents (adolescent type) and often affects overweight children more severely. Without intervention, the condition may progress over time.

Rickets-Related Bow Legs

Caused by vitamin D deficiency or metabolic disorders affecting bone mineralisation. Bones may be softer and more prone to bending under body weight creating the characteristic bowed appearance along with other skeletal deformities.

Causes

Normal developmental variation in infants and toddlers
Blount’s disease affecting the growth plate near the knee
Nutritional rickets from vitamin D, calcium, or phosphate deficiency
Metabolic bone diseases affecting bone strength and structure
Previous infections affecting bone or growth plate development
Trauma or fractures that may have healed with some angulation
Genetic conditions such as achondroplasia or osteogenesis imperfecta
Bone dysplasias affecting skeletal development

Risk Factors

Early walking before 12 months of age
Higher body weight in some children
Family history of bow legs or bone disorders
Nutritional deficiencies, particularly in vitamin D
Limited sun exposure affecting vitamin D synthesis
Dietary restrictions limiting calcium and vitamin D intake
Certain chronic medical conditions affecting bone metabolism
Geographic regions with limited sunlight exposure

Signs & Symptoms

Mild Presentation

Visible outward curving of legs when standing
Gap between knees when ankles are together
Symmetrical bowing in both legs
No pain or discomfort during activities
Walking pattern may appear typical despite leg shape
No limitation in physical activities

Moderate Presentation

More pronounced bowing visible from front and back
Awkward gait or walking pattern
Increased stumbling or tripping
Mild discomfort after prolonged activity
Shoes wearing unevenly on outer edges
Difficulty with certain physical activities

Severe Symptoms

Significant bowing affecting mobility
Knee or hip pain during walking
Progressive worsening of leg alignment
Obvious limp or altered gait pattern
Joint stiffness or reduced range of motion
Apparent shorter stature compared with peers may be observed

Bow legs are often noticed in young children as they begin to stand or walk. In many cases, this improves naturally with growth, though some children may require further assessment if the bowing persists or worsens over time.

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When to See a Doctor

Consultation with an orthopaedic surgeon may be considered if bow legs persist beyond age three, appear to be worsening, or are accompanied by pain, limping, or asymmetry between legs. Evaluation may be recommended if your child experiences sudden worsening of bowing, develops a limp, complains of persistent knee or hip pain, or shows signs of developmental delays. Adults who develop bow legs or notice progression may benefit from evaluation.

During your first consultation, the orthopaedic surgeon will conduct a thorough physical examination, assess walking patterns, and measure the degree of bowing. The doctor will review your child’s growth history, nutritional status, and family medical history. X-rays and other imaging studies may be ordered to evaluate bone structure and identify any underlying conditions.

Diagnosis & Testing Methods

The diagnostic process for bow legs begins with a comprehensive clinical examination where the orthopaedic surgeon measures the intercondylar distance (gap between knees) and assesses the angle of bowing. Standing X-rays of both legs provide crucial information about bone alignment, growth plates, and any structural abnormalities. These images help differentiate between physiological and pathological bowing.

Blood tests may be ordered to check vitamin D levels, calcium, phosphate, and alkaline phosphatase to rule out metabolic causes like rickets. In some cases, genetic testing might be recommended if a hereditary condition is suspected. For complex cases, MRI scanning can provide detailed images of growth plates and soft tissues around the knee joint.

The orthopaedic surgeon may also use specialised measurements like the metaphyseal-diaphyseal angle to assess severity and predict progression, particularly in suspected Blount’s disease. Regular follow-up imaging helps monitor changes over time and guides treatment decisions. Results are typically available within a few days, helping guide appropriate management.

Treatment Options Overview

Observation and Monitoring

For physiological bow legs in children under two, careful observation with regular follow-up appointments is often sufficient. The orthopaedic surgeon will track the child’s growth and leg alignment through periodic examinations every 3-6 months. Documentation through photographs and measurements helps assess whether the condition is improving naturally or requires intervention.

Nutritional Supplementation

When bow legs result from nutritional deficiencies, vitamin D and calcium supplementation forms the cornerstone of treatment. The orthopaedic surgeon will prescribe appropriate doses based on blood test results and monitor response through regular follow-ups. Dietary counselling ensures adequate intake of bone-building nutrients, while safe sun exposure recommendations help boost natural vitamin D production.

Bracing Treatment

For children with progressive bow legs or early Blount’s disease, specialised braces can help guide proper leg alignment during growth. These custom-fitted devices apply gentle corrective forces to gradually improve leg position. Bracing can help guide leg alignment when used according to the orthopaedic surgeon’s recommendations and requires consistent wear, typically during sleep and certain daily activities. Regular adjustments ensure optimal effectiveness as the child grows.

Physiotherapy

Structured physiotherapy programmes strengthen muscles around the knees and hips while improving gait patterns. Physiotherapist teach specific exercises to enhance balance, coordination, and proper walking mechanics. Stretching routines address any muscle tightness that may contribute to abnormal alignment. Home exercise programmes complement clinical sessions for comprehensive rehabilitation.

Growth Modulation Surgery

This minimally invasive procedure uses small plates or staples to temporarily slow growth on one side of the growth plate, allowing the other side to catch up and correct the deformity. Performed through small incisions, this technique harnesses the child’s natural growth potential. The implants are removed once correction is achieved, typically after 12-24 months.

Osteotomy Surgery

For severe cases or when growth has completed, osteotomy involves surgically cutting and realigning the bones to correct the bowing. The orthopaedic surgeon precisely calculates the correction needed and uses plates, screws, or external fixators to maintain the new position while bones heal. Rehabilitation may be required to support functional recovery.

External Fixation

In more complex cases, specialised surgical techniques may be used to gradually correct alignment and improve function over time. These methods are typically reserved for severe deformities that may not respond to standard treatments.

Every patient’s condition is unique.

Our Senior Consultant Orthopaedic Surgeon will assess your specific situation and discuss suitable treatment approaches with you.

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Complications if Left Untreated

Untreated pathological bow legs can lead to significant long-term complications affecting mobility and quality of life. Progressive deformity places abnormal stress on knee joints, leading to early arthritis and chronic pain. The altered biomechanics affect hip and ankle joints as well, potentially causing widespread joint degeneration. Severe cases may result in significant height loss and permanent disability.

The psychological impact of visible deformity can affect self-esteem and social development, particularly in adolescents. Gait abnormalities increase the risk of falls and injuries, while chronic pain may limit participation in physical activities and sports. In cases caused by underlying metabolic conditions, failure to address the root cause can lead to other skeletal deformities and systemic health problems. Early treatment prevents these complications and preserves long-term joint health and function.

Prevention

While physiological bow legs cannot be prevented as they represent normal development, several measures can reduce the risk of pathological bowing. Ensuring adequate vitamin D through safe sun exposure and dietary sources helps maintain strong bones. In Singapore’s tropical climate, 15-20 minutes of morning or late afternoon sun exposure provides sufficient vitamin D for most people.

Proper nutrition during pregnancy and childhood supports healthy bone development. Breastfed infants may need vitamin D supplements as recommended by paediatricians. Maintaining healthy body weight reduces stress on developing bones and joints. Regular check-ups allow early detection of any abnormal bowing patterns. For families with genetic conditions affecting bones, genetic counselling can provide valuable guidance for family planning and early intervention strategies.

Bow legs

Frequently Asked Questions

At what age should bow legs naturally straighten?

Physiological bow legs typically improve by age 18-24 months and should fully resolve by age 3-4 years. Most children develop straight legs by their third birthday. Persistent or asymmetrical bowing beyond age three may indicate an underlying condition that can be assessed by a healthcare professional.

Can bow legs be corrected without surgery in older children and adults?

Non-surgical correction becomes less effective after growth plates close, typically around age 14-16. While bracing and physical therapy may help mild cases in growing children, significant deformities in older patients usually require surgical intervention. Treatment approaches vary based on age, severity, and underlying cause.

How long does recovery take after bow legs correction surgery?

Recovery time varies depending on the procedure performed. Growth modulation surgery allows return to normal activities within 2-4 weeks, though the correction process continues for 12-24 months. Osteotomy procedures require 3-4 months for bone healing, followed by several months of rehabilitation. External fixation treatment extends over 3-6 months. Recovery timelines vary depending on the procedure performed and individual factors.

Will my child need special shoes or insoles for bow legs?

Special shoes or insoles do not correct bow legs and are generally not recommended as primary treatment. Standard, well-fitting shoes are adequate for most children with bow legs. After surgical correction, temporary use of supportive footwear may be recommended during recovery. Appropriate footwear depends on individual circumstances and treatment history.

Is bow legs correction covered by insurance in Singapore?

Coverage varies significantly between insurance plans and depends on whether the condition is classified as congenital, developmental, or acquired. Procedure codes can be used to verify coverage details with your insurer.

Can adults develop bow legs, or is it only a childhood condition?

While bow legs most commonly develop in childhood, adults can develop this condition due to arthritis, previous injuries, bone infections, or metabolic bone diseases. Occupational factors involving repetitive stress on legs may also contribute. Adult-onset bow legs often indicate underlying joint or bone pathology requiring thorough evaluation. Treatment approaches differ from childhood cases and focus on addressing both the deformity and underlying cause.

Conclusion

Bow legs represent a spectrum from normal developmental variation to conditions requiring medical intervention. Understanding when bowing is concerning and seeking timely evaluation ensures appropriate treatment and prevents long-term complications. With current orthopaedic treatments, from growth modulation techniques to precise surgical corrections, patients of all ages can achieve improved leg alignment and function. Early consultation with a qualified orthopaedic surgeon provides good opportunity for successful treatment outcomes.

Take the First Step Towards Better Health

Living with bow legs can be challenging, but our Senior Consultant Orthopaedic Surgeon has considerable experience diagnosing and treating bow legs using evidence-based approaches.

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Dr Zackary Chua (蔡克祥医生)

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (AUS)|MMed (Singapore)|MRCS (Glasgow)|FRCSEd (Orth)

A senior consultant orthopaedic surgeon with dual specialisations in Foot & Ankle Surgery and Paediatric Orthopaedics. Backed by his extensive years of training and experience, Dr Chua brings the necessary knowledge and skills to ensure a smooth recovery journey.

Rooted firmly by two fundamental philosophies: “When one’s feet hurt, one hurts all over” and “Children are not little adults”, Dr Chua’s approach to patient care reflects his compassionate care for adults and children.

Singhealth Quality Excellence Award – Silver (2011)
Service From the Heart Award (2021)
Singapore Health Quality Service Award – Gold (2023)
NUS Medicine Dean’s Award for Teaching Excellence (2023)

His active participation in the medical community extends to mentoring, research supervision, and contributions to key professional forums and symposiums, both locally and internationally.