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Related Experiment Video

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Author Spotlight: Double Posteromedial Approach for Treating Posterior Cruciate Ligament Cysts
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Empty Sunrise Sign: An Arthroscopic Finding in Recurrent Patellar Dislocation.

Craig Smith1, Jeffrey Otte1, Robert Steensen1,2

  • 1Department of Orthopedic Surgery, Mount Carmel Health System, Columbus, Ohio.

The Journal of Knee Surgery
|December 14, 2018
PubMed
Summary

The Empty Sunrise Sign, an arthroscopic finding, accurately identifies recurrent patellar dislocation. This sign indicates significant capsular laxity, crucial for surgical planning in knee injuries.

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Area of Science:

  • Orthopedics
  • Knee Surgery
  • Arthroscopy

Background:

  • Patellar dislocation is a common knee injury.
  • Diagnosis can be challenging, especially for recurrent cases.
  • Arthroscopic findings offer potential diagnostic insights.

Purpose of the Study:

  • To describe a novel arthroscopic finding in recurrent patellar dislocation.
  • To evaluate the diagnostic utility of the 'Empty Sunrise Sign'.
  • To assess the association of the sign with capsular laxity.

Main Methods:

  • Arthroscopic photographs from 50 knees with recurrent patellar dislocation and 100 control knees were reviewed.
  • Patellar subluxation was quantified on a single arthroscopic view.
  • The 'Empty Sunrise Sign' was defined as the patella not overlapping the trochlea.

Main Results:

  • The Empty Sunrise Sign was present in 82% of recurrent patellar dislocation cases.
  • The sign was absent in all 100 control cases, yielding 100% specificity.
  • High interobserver agreement was achieved in identifying the sign.

Conclusions:

  • The Empty Sunrise Sign is a highly specific arthroscopic finding for recurrent patellar dislocation.
  • This sign suggests significant capsular laxity.
  • Consideration of the Empty Sunrise Sign may be important in surgical treatment strategies for recurrent patellar dislocation.