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Related Experiment Videos

Patellar dislocation in achondroplasia.

Yuji Takamine1, Hiroshi Kitoh, Hironori Ito

  • 1Department of Orthopaedic Surgery, Central Hospital, Aichi Welfare Center for Persons with Developmental Disabilities, Kasugai, Aichi, Japan. yujitaka@sannet.ne.jp

Journal of Pediatric Orthopedics. Part B
|November 29, 2007
PubMed
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Achondroplasia patients often experience permanent patellar dislocation due to bony malformations in the patellofemoral joint, alongside soft tissue issues. This study highlights significant differences in femoral sulcus angles compared to controls.

Area of Science:

  • Orthopedics
  • Radiology
  • Genetics

Background:

  • Achondroplasia is a common genetic disorder affecting bone growth.
  • Knee abnormalities, including patellar dislocation, can occur in achondroplasia patients.
  • The underlying causes of patellar dislocation in achondroplasia require further investigation.

Purpose of the Study:

  • To investigate knee joint abnormalities in achondroplasia patients using plain radiographs.
  • To compare specific knee joint parameters between achondroplasia patients and a control group.
  • To explore potential bony contributions to patellar dislocation in achondroplasia.

Main Methods:

  • Plain radiographs of the knee were obtained from 20 achondroplasia patients (40 knees).
  • A control group of 50 knees without skeletal dysplasia was used for comparison.

Related Experiment Videos

  • Radiographic measurements included femoral sulcus angle, femorotibial angle, Insall-Salvati index, and Q angle.

    • Main Results:

    • Five achondroplasia patients (seven knees) presented with permanent patellar dislocation.
    • A significant difference was observed in the femoral sulcus angle between achondroplasia and control groups.
    • No significant differences were found in the femorotibial angle, Insall-Salvati index, or Q angle.

    Conclusions:

    • Patellar dislocation in achondroplasia may result from a combination of soft tissue abnormalities and bony malformations, specifically a shallow patellofemoral joint groove.
    • The femoral sulcus angle is a key radiographic indicator differentiating achondroplasia knees.
    • Further research is warranted to fully elucidate the biomechanics of knee instability in achondroplasia.