Mechanism:
Mechanical overload
Growth inhibition via Hueter–Volkmann principle
Untreated disease → multiplanar deformity
Varus
Internal tibial rotation
Procurvatum
Limb length discrepancy
Epidemiology & Risk Factors
Overall prevalence: <1%
Male predominance
Strong associations:
Obesity
Early walking
Mechanical overload
African-American ethnicity
Pathophysiology
Chronic compressive forces on the posteromedial proximal tibial physis
Results in:
Disrupted enchondral ossification
Asymmetric medial growth suppression
Disease progression:
Characteristic medial physeal pathology with Langenskiöld changes
Early stages: potentially reversible growth disturbance
Advanced stages: epiphyseal depression and physeal bar formation
Clinical Presentation
Persistent genu varum beyond physiologic age (>2 years)
Usually painless
Frequently bilateral
Deformity is often progressive and asymmetric
Key clinical sign: Lateral thrust during gait (mechanical instability)
Imaging
Standing long-leg AP radiographs (hip to ankle) are mandatory
Typical findings:
Medial metaphyseal beaking
Widened and irregular medial physis
Varus mechanical axis deviation
Metaphyseal–Diaphyseal Angle (MDA) (Levine-Drennan Angle)
16° → high risk of progression
<10° → likely physiologic bowing
11–16° → close follow-up
Staging:
Langenskiöld classification (I–VI) is used
MRI indications (selected cases):
Suspected physeal bar
Early cartilage changes
Preoperative planning in neglected disease
Treatment Goals
Restore mechanical axis
Prevent recurrence
Minimize risk of early osteoarthritis
Non-operative
KAFO bracing
Best suited for early-stage disease (Langenskiöld I-II)
Most effective in:
age <4
Non-obese children
Unilateral involvement
Limited role in older children
Surgical Indications
Progressive varus deformity
Failure of bracing
MDA >16°
Presence of lateral thrust or instability
Advanced radiographic changes
Operative
Guided growth (hemiepiphysiodesis)
age >4 years old
Mild–moderate deformity (stage I-II, perhaps III)
Open physes
Less predictable than idiopathic genu varum
Proximal tibial osteotomy
age > 3 years old regardless of stage or stage III irrespective of age
Mainstay for established disease
Allows correction of varus, rotation, and procurvatum
Osteotomy below tibial tuberosity to prevent patella baja
Technique considerations:
Acute correction
immediate alignment, higher risk of peroneal nerve injury and compartment syndrome
Gradual correction (external fixation):
Better multiplanar control
Preferred in severe deformity
Advanced disease may require:
Medial tibial plateau elevation
Combined epiphysiodesis to prevent recurrence
Prognosis
Strongly dependent on age and stage at treatment
Early intervention:
Higher correction rates
Lower recurrence
Delayed or advanced disease:
Residual deformity
Limb length discrepancy
Early medial compartment osteoarthritis
Differential Diagnosis
Physiologic genu varum
Rickets (asymmetrical beaking and sharp angular deformities absent)
Ollier disease (multiple enchondromas present)
Skeletal dysplasias
Metabolic bone disease
Post-traumatic physeal injury
Thrombocytopenia absent radius sydnrome
Adolescent Tibia Vara
Onset >8 years of age, without early epiphyseal deformity
Considered a distinct clinical entity from infantile tibia vara
Deformity is predominantly related to mechanical overload, rather than primary physeal dysplasia
Strongly associated with obesity
Typically unilateral and symptomatic
Clinical Characteristics
o Progressive genu varum
o Medial knee pain and activity-related symptoms are common
o Functional limitations are more prominent than in infantile disease
o Lateral thrust may be observed
o Multilevel deformity is frequent, involving the proximal tibia ± distal femur
Imaging Characteristics
o Standing hip-to-ankle radiographs are essential
o Mechanical axis deviation is the primary radiographic finding
o Medial physeal changes are usually subtle, usually without true physeal bar
o Langenskiöld classification is not reliable and should not guide management
o MRI is used selectively for complex deformities or surgical planning
Treatment Considerations
o Bracing has no established role
o Remaining growth potential is limited, reducing the effectiveness of guided growth
o Proximal tibial osteotomy is the main treatment option
o Gradual correction is preferred in obese patients and severe or multiplanar deformities
o Limited remaining growth and increased mechanical load reduce the predictability of guided growth
o Concomitant distal femoral correction may be required
Prognosis
o Depends on deformity severity and accuracy of correction
o Delayed treatment increases the risk of early medial compartment degeneration
o Distal femoral contribution to varus deformity is common and should be systematically assessed
o Isolated tibial correction may result in residual malalignment if femoral deformity is overlooked
o Residual varus alignment is a major risk factor for early medial compartment osteoarthritis