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Area of Science:

  • Pediatric Orthopedics
  • Genetics and Musculoskeletal Disorders

Background:

  • Osteogenesis imperfecta (OI) is a genetic disorder affecting collagen, leading to brittle bones and deformities.
  • Surgical intervention, primarily intramedullary rodding, is used for progressive deformities in OI.
  • Limb length discrepancy (LLD) is a known complication, but its prevalence and contributing factors in OI are not well understood.

Purpose of the Study:

  • To determine the prevalence of LLD in children with osteogenesis imperfecta (OI).
  • To identify risk factors associated with LLD in pediatric OI patients.
  • To analyze the longitudinal changes in LLD over time in OI patients.

Main Methods:

  • A retrospective study of 78 children with OI, including 30 nonoperative and 48 operative cases.
  • Longitudinal tracking of LLD using full-length lower extremity radiographs over a minimum of two years.
  • LLD defined as a >5 mm difference in combined femur and tibia length; surgical patients required 18 months of postoperative data.

Main Results:

  • LLD was observed in 90% of nonoperative and 96% of operative patients.
  • Mean LLD was significantly higher in the surgical group (1 cm) compared to the nonoperative group (0.43 cm).
  • No association found between LLD and OI severity, ambulation status, or number of rods; LLD progression varied individually.

Conclusions:

  • The prevalence of LLD in children with OI exceeds 90% across all severities.
  • Surgical intramedullary rodding is not an independent risk factor for developing LLD in OI.
  • LLD in OI patients does not exhibit a consistent growth pattern, with individual variations observed over time.