Laboratory studies: no aid in the diagnosis of Blount disease.Forms of the disease diagnosis is based on history, physical examination and knee radiography.
Imaging Studies:
Knee radiograph is critical in evaluating the severity and staging ofdeformation. Note the bulge in the fragmentation of thedeformation step and beak-shaped proximal tibial metaphysicalpornography. Lateral cortical wall is almost straight proximal tibialmetaphysical. Differentiation between physiologic and bulgingsevere infantile Blount's disease is difficult in early childhood.Therefore, corrective interventions are not recommended for children under 2 years.
Early changes of infant disease may be assessed by measuring the metaphysical-shaft angle of the proximal tibia. The severity ofdeformity in varus angle based on anteroposterior X-ray measuredtibiofemural including knee, ankle and femur.
Scanning scintigraphy is sensitive in assessing skeletal growthplateaus fucntiilor growing. Mechanical load and stress factorsinfluencing the uptake scintigraphy platoulul growth. Whenimmobilization is prolonged and when growth plateaus beginclosing activity decreases. In patients with angular deformity of thefoot half of the growth plate becomes more active against the otherhalf. In patients with Blount's disease is increased uptake in medialtibial plateau and distal femur.
MRI has the advantage of directly detecting epiphysis and growthplate. Epiphyseal involvement may demonstrate enlargement.Fizeau merger early proximal medial tibia and rarely the distalmedial femoral Fizeau may occur by chronic application ofbiomechanical forces.
The differential diagnosis is made with the following conditions:physiological genu varum, genu varum congenital rickets, Ollierdisease, trauma, osteomyelitis, fracture of the tibial plateau,condrodisplazia metaphysics.
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