Empty notch sign (anterior cruciate ligament tear)
Last revised by Francis Deng ◉ on 7 Feb 2020
Citation, DOI, disclosures and article data
Glick Y, Deng F, Murphy A, Empty notch sign (anterior cruciate ligament tear). Reference article, Radiopaedia.org (Accessed on 28 Mar 2023) https://doi.org/10.53347/rID-62212
5 Aug 2018, Yaïr Glick ◉
At the time the article was created Yaïr Glick had no recorded disclosures.View Yaïr Glick's current disclosures
7 Feb 2020, Francis Deng ◉
At the time the article was last revised Francis Deng had no recorded disclosures.View Francis Deng's current disclosures
5 times, by 3 contributors - see full revision history and disclosures
Empty notch sign is a direct sign of anterior cruciate ligament (ACL) tear/avulsion at its femoral attachment. It denotes a fluid signal at the expected ACL attachment site at the intercondylar notch (fossa) on axial and coronal fluid-sensitive MR images.
The proximal ACL is the second most common site of injury after the midsubstance. Hence, close scrutiny of the attachments of the ACL is warranted.
- 1. Tung GA, Davis LM, Wiggins ME, Fadale PD. Tears of the anterior cruciate ligament: primary and secondary signs at MR imaging. Radiology 1993; 188:3. DOI:10.1148/radiology.188.3.8351329