blount's disease is ?
a- genu valgus
b- tibia vara
c- flat foot
d- genu recurvatum
answer is b . tibia vara
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- Infantile Blounts Disease: (pathologic tibia vara)
- differential diagnosis and examination
- most common form of disease;
- growth disorder of medial portion of proximal tibial physis;
- characterized by medial angulation& internal rotation of proximal tibia;
- etiology is related to repetitive trauma to posteromedial proximal tibia physis from ambulating on a knee with varus alignment;
- infantile tibia vara is seen between 2-4 years of age;
- usually bilateral;
- associated with internal tibial torsion;
- children w/ tibia vara are usually in upper percentiles of weight (for age)& began walking early;
- this contrasts w/ dysplastic children who present w/ bow legs but who are in the lower percentiles for height and weight;
- gait is characterized by painless varus thrust in stance phase;
- Radiographs:
- show metaphyseal diaphyseal angle of >11 deg early (this angle is formed by lines between metaphyseal beaks& perpendicular
to the longitudinal axis of the tibia);
- radiographs show a localized deformity at proximal tibial level w/ a medial metaphyseal lesion;
- in contrast, the common physiologic bowlegs involves both the tibia &distal femur (during 2nd year);
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