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Early roentgenographic evaluation of bowlegged children
Insights
Prognosis for bowlegs in children under 30 months depends on specific radiographic signs like fibula length and tibial angulation. Early identification of persistent bowlegs is crucial for timely intervention.
Area of Science:
- Pediatric Orthopedics
- Pediatric Radiology
Background:
- Bowlegs (genu varum) are common in young children.
- Distinguishing physiologic bowlegs from pathological conditions like Blount's disease is clinically important.
Purpose of the Study:
- To identify radiographic predictors of persistent infantile bowlegs.
- To evaluate the reliability of initial roentgenographic interpretations.
Main Methods:
- Retrospective radiographic analysis of 39 knees in 21 children under 30 months with bowlegs.
- Longitudinal follow-up until resolution, persistence past 30 months, or surgery.
Main Results:
- Older children at presentation had poorer prognoses.
- Longer fibula relative to tibia and more acute proximal tibial angulation were associated with persistent bowing.
- Spontaneous resolution was less likely in girls.
- Initial interpretations of "physiologic bowlegs" or "Blount's disease" were unreliable.
Conclusions:
- Radiographic parameters, including fibula-to-tibia ratio and tibial angulation, can predict persistent infantile bowlegs.
- Age at presentation and sex are important prognostic factors.
- Clinical judgment based on initial roentgenograms may be less reliable than objective radiographic measurements.
Abstract:
Thirty-nine knees in 21 bowlegged children under the age of 30 months were examined roentgenographically at initial clinic visit. All were followed until bowing resolved, bowing persisted past age 30 months, or surgery was performed. Older bowlegged children had strikingly poorer prognoses. We identified (a) longer fibula than tibia and (b) more acute proximal tibial angulation than distal femoral angulation as possible prognostic signs that bowing was likely to persist. Bowlegs in girls seem less likely to resolve spontaneously than in boys. Race does not seem to be a factor. The initial examiner's interpretation of roentgenograms as "physiologic bowlegs" or "Blount's disease" was not found to be reliable.