The bifid anterior coracoscapular ligament: a new morphological variation and its potential clinical implications.

The suprascapular notch (SSN) is the most common site of compression and injury of the suprascapular nerve (SN), which results in a neuropathy known as SN entrapment. The SSN is enclosed from the top by the superior transverse scapular ligament (STSL), creating a tunnel for the SN. On both sides of the SSN, below the STSL, the anterior coracoscapular ligament is found. This fibrous band can potentially narrow the opening and contribute to the occurrence of suprascapular entrapment syndrome. This study presents the first case of a bifid anterior coracoscapular ligament coexisting with an atypical SN course, which has never been described in the literature before. Knowledge of such anatomical variations can be helpful in arthroscopic and open procedures of the suprascapular region and confirms the safety of operative decompression for entrapment of the SN.