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Related Experiment Videos

Late-onset tibia vara (Blount's disease). Current concepts.

G H Thompson1, J R Carter

  • 1Department of Orthopaedics, Case Western Reserve University, Cleveland, Ohio 44109.

Clinical Orthopaedics and Related Research
|June 1, 1990
PubMed
Summary

Late-onset tibia vara (Blount's disease) in juvenile and adolescent patients shows similar characteristics, with late-onset males experiencing higher recurrence rates after surgery. Etiology involves growth suppression and ossification disruption.

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Area of Science:

  • Orthopedics
  • Pediatric Orthopedics
  • Skeletal Dysplasias

Background:

  • Idiopathic tibia vara, or Blount's disease, presents in infantile (less than 3 years), juvenile (4-10 years), and adolescent (11+ years) age groups.
  • Late-onset tibia vara encompasses juvenile and adolescent forms, which are less common than the infantile presentation.

Purpose of the Study:

  • To compare clinical, roentgenographic, and histopathologic features of juvenile-onset and adolescent-onset tibia vara.
  • To investigate potential common etiologies and identify differences in surgical outcomes between late-onset tibia vara groups.

Main Methods:

  • Comparative analysis of eight juvenile-onset (13 knees) and seven adolescent-onset (9 knees) patients.
  • Clinical and roentgenographic assessment, alongside physeal-histopathologic analysis of proximal tibia in select cases.

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  • Evaluation of surgical correction outcomes, including recurrence and incomplete correction rates.

    • Main Results:

    • No significant clinical, roentgenographic, or histopathologic differences were found between juvenile and adolescent onset tibia vara.
    • Both groups exhibited severe obesity, mild-to-moderate varus deformities, and less pronounced radiographic findings.
    • Histopathology suggested a common etiology with infantile tibia vara and slipped-capital femoral epiphyses.
    • Recurrence after surgery was frequent in juvenile males but not in juvenile females or adolescent-onset patients.
    • Incomplete varus correction was more common in the adolescent-onset group.

    Conclusions:

    • Late-onset tibia vara in juvenile and adolescent patients shares similar characteristics, suggesting a common underlying pathophysiology.
    • Varus stress growth suppression and disruption of endochondral ossification are implicated etiologies.
    • Age at onset, remaining growth potential, and medial knee compression forces are key differentiating factors between age groups.