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Results of Correction of Late Onset Blount Disease Deformity by Distraction Osteogenesis

Riad Mansour Megahed*

Background: Blount disease (tibia vara) is a developmental condition. Two clinically distinct forms of Blount disease early-onset and late-onset have been described, with the classifications based on whether the limb deformity develops before or after the age of four years.

Aim of the work: Evaluation of the results of management of tibia vara due to late onset Blount disease by gradual correction with distraction osteogenesis.

Materials and Methods: This prospective study was conducted on twenty limbs in fourteen cases had late onset Blount disease in Zagazig University hospitals, Sharqia between 2011 and 2015. Gradual correction with distraction osteogenesis using the Ilizarov device was done for all of the patients.

Results: Results of treatment was evaluated using clinical and radiological parameters based on a modification of the criteria of Schoenecker et al. and graded them as 70% good, 30% fair and no poor results. Radiographic evaluation was done according to the Paley et al. restoration of the mechanical axis of the lower limb to normal parameters.

Conclusion: Gradual correction of the deformity in cases of late onset Blount disease by distraction osteogenesis using the circular fixator appears to be a safe and reliable means of treating multiplanar deformities, allowing the depressed medial tibial plateau, procurvatum and internal tibial torsion to be addressed in addition to proximal tibia varus deformity. Also allow correction of limb-length discrepancy, even in obese patients.