Adolescent Blount disease in Adult
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Synopsis
Causes / typical injury mechanism: Blount disease is a growth disorder of the medial proximal tibial physis and epiphysis that results in genu varum malalignment deformity.Classic history and presentation: Late-onset or adolescent Blount disease usually presents in patients older than 10 years.
Prevalence:
- Age – Seen in patients older than 10 years.
- Sex / gender – Male predominance.
Pathophysiology: The exact pathophysiology is unknown. It may occur due to excessive mechanical loading as a larger thigh size increases the varus-inducing load, and there may be genetic susceptibility factors.
Codes
ICD10CM:M92.519 – Juvenile osteochondrosis of proximal tibia, unspecified leg
SNOMEDCT:
880067009 – Blount disease
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Diagnostic Pearls
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Differential Diagnosis & Pitfalls
- Persistent physiological varus deformity
- Rickets of vitamin D deficiency
- Renal osteodystrophy
- Vitamin D-resistant (hypophosphatemic) rickets
- Metaphyseal dysostosis (Schmid, Jansen types)
- Spondyloepiphyseal or metaphyseal / epiphyseal dysplasias
- Thrombocytopenia-absent radius syndrome
- Focal fibrocartilaginous defect
- Proximal tibial physeal injury (eg, infection, fracture, irradiation)
Best Tests
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Management Pearls
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Therapy
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References
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Last Reviewed:01/19/2021
Last Updated:01/27/2022
Last Updated:01/27/2022
Adolescent Blount disease in Adult