Arcuate sign

Case contributed by A.Prof Frank Gaillard

Presentation

Acute knee injury

X-ray

Best seen on the anterior projection is a small curvilinear calcific opacity immediately superior to the fibular styloid. The adjacent tibia is intact. 

Diagram

Annotated

The posterolateral ligamentous complex of the knee includes:

Case Discussion

The arcuate sign is an important finding, representing an avulsion fracture of the arcuate ligament complex. The importance of this injury is that if it is not diagnosed acutely, posterolateral instability may develop which is challenging to correct, and may result in failed cruciate ligament reconstruction.

PlayAdd to Share

Case information

rID: 7986
Case created: 25th Dec 2009
Last edited: 27th Nov 2015
Tag: knee
Inclusion in quiz mode: Included

Updating… Please wait.
Loadinganimation

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.