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Related Experiment Videos

Knee deformities in multiple hereditary exostoses. A longitudinal radiographic study

K Nawata1, R Teshima, T Minamizaki

  • 1Department of Orthopedic Surgery, Faculty of Medicine, Tottori University, Yonago, Japan.

Clinical Orthopaedics and Related Research
|April 1, 1995
PubMed
Summary

Multiple hereditary exostoses can cause significant knee deformities, primarily genu valgum, due to tibial angulation. These changes often develop during growth spurts and may lead to patellar dislocations.

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Area of Science:

  • Orthopedics
  • Genetics
  • Pediatric Radiology

Background:

  • Multiple hereditary exostoses (MHE) is a genetic disorder characterized by the development of multiple osteochondromas.
  • Knee deformities are a common complication in MHE patients, impacting growth and joint function.

Purpose of the Study:

  • To radiographically evaluate the morphology and annual changes of knee deformities in pediatric patients with MHE.
  • To identify the primary cause of knee valgus in MHE and its association with patellar instability.

Main Methods:

  • Longitudinal radiographic evaluation of 16 knees in 8 pediatric patients with MHE over a mean of 7.8 years.
  • Analysis of femorotibial angles and tibial/femoral angulation.
  • Correlation of knee deformity with patellar dislocation incidence.

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Main Results:

  • Knee deformities, predominantly genu valgum, developed during the patients' growth spurt.
  • A significant decrease in the femorotibial angle ( > 2 standard deviations) was observed in 6 of 16 knees.
  • Valgus angulation of the proximal tibia was consistently identified as the cause of genu valgum in all affected knees.
  • Recurrent patellar dislocation occurred in 3 of the 6 knees with significant genu valgum.

Conclusions:

  • Genu valgum is the primary knee deformity in pediatric MHE, driven by tibial valgus angulation.
  • The development of genu valgum during growth spurts is a key feature of MHE-related knee pathology.
  • Significant genu valgum increases the risk of patellar dislocation in patients with MHE.