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Related Experiment Video

Updated: Apr 13, 2026

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position
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Instability Testing for Congenital Hip Dislocation: Knee Extension Provokes Hip Dislocation.

Panagiotis V Samelis1,2

  • 1First Orthopaedic Department, Children's General Hospital Panagiotis & Aglaia Kyriakou, Athens, GRC.

Cureus
|June 17, 2020
PubMed
Summary

A new clinical sign for newborn hip instability is described: knee extension causes dislocation. This offers a more objective method for diagnosis and treatment selection compared to traditional tests.

Keywords:
barlowcongenitaldevelopmentaldislocationdysplasiaextensionhipkneeortolanispica

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Area of Science:

  • Orthopedics
  • Pediatric diagnostics
  • Neonatal care

Background:

  • Traditional Ortolani and Barlow signs for diagnosing newborn hip instability are subjective and examiner-dependent.
  • Current diagnostic methods lack objective criteria for selecting appropriate immobilization devices like hip spica casts or Pavlik harnesses.

Observation:

  • The elicitation of positive Ortolani and Barlow signs relies heavily on examiner experience and applied manual pressure.
  • These signs do not guide the choice of post-reduction treatment for unstable hips.

Findings:

  • A novel clinical sign is introduced: knee extension provokes dislocation of an unstable ipsilateral hip in newborns.
  • This sign provides a more objective method for detecting hip instability and guiding treatment decisions.

Implications:

  • The new sign may improve the accuracy and objectivity of diagnosing neonatal hip instability.
  • It could lead to more appropriate and timely selection of immobilization devices, potentially improving patient outcomes.