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Related Experiment Videos

Acetabular development after reduction in developmental dislocation of the hip.

E Gotoh1, M Tsuji, T Matsuno

  • 1Department of Orthopaedic Surgery, Asahikawa Medical College, Nishikagura Asahikawa City, Japan.

Clinical Orthopaedics and Related Research
|September 15, 2000
PubMed
Summary

Early hip measurements can predict developmental dislocation of the hip outcomes. A low center edge angle and high acetabular index at age 5 indicate potential for unsatisfactory results, suggesting early intervention may improve outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Pediatric Radiology
  • Developmental Orthopedics

Background:

  • Developmental dislocation of the hip (DDH) requires accurate prognostication for optimal treatment.
  • Radiographic parameters like the center edge angle and acetabular index are crucial for assessing hip joint stability.
  • Longitudinal studies are needed to understand the predictive value of early radiographic findings in DDH.

Purpose of the Study:

  • To determine if early radiographic measurements (center edge angle and acetabular index) at age 5 can predict final radiographic outcomes in patients with developmental dislocation of the hip.
  • To evaluate the correlation between early and late radiographic parameters in DDH.
  • To inform treatment decisions for DDH based on predictive radiographic analysis.

Main Methods:

Related Experiment Videos

  • A retrospective radiologic study of 56 patients (63 hips) with developmental dislocation of the hip.
  • Classification of hips into satisfactory (Severin Groups I and II) or unsatisfactory (Severin Groups III and IV) based on radiographs at skeletal maturity.
  • Sequential measurement and comparison of center edge angle and acetabular index at ages 5, 10, and 15 years.

Main Results:

  • A significant relationship was observed between the center edge angle and acetabular index at age 5 and the final outcome.
  • 85.7% of patients with a center edge angle < 8 degrees and acetabular index > 26 degrees at age 5 were classified as Severin Groups III and IV at skeletal maturity.
  • These specific early radiographic findings strongly predict unsatisfactory long-term results.

Conclusions:

  • Radiographic results at skeletal maturity in developmental dislocation of the hip can be predicted by measurements taken at age 5.
  • A center edge angle less than 8 degrees and an acetabular index greater than 26 degrees at age 5 are indicators of potential poor outcome.
  • Authors recommend considering osteotomy for hips with these measurements at age 5 to improve the final outcome.