The trifid superior transverse scapular ligament: a case report and review of the literature.

During dissection of a 75-year-old Caucasian female cadaver, a trifid superior transverse scapular ligament (STSL) was found. The suprascapular nerve and vessels ran inferior to the STSL though the suprascapular notch. Measurements of the structures of the suprascapular region were taken using two complementary but independent methods: a classical method using an electronic digimatic calliper and a new one based on an analysis of digital photographic documentation of the STSL. The knowledge of anatomic variations of the STSL is important because this structure is the most commonly recognised possible predisposing factor of suprascapular nerve entrapment and can be helpful in diagnosis and surgical and arthroscopic treatment of this pathology.