Introduction: The classic description of superior transverse scapular ligament (STSL) is a completely non-ossified single band and should be expected on average, in three-fourth of cases. Age, mechanical load, sex and genetic factors may be responsible for ossification of STSL. Variations in the STSL and the suprascapular notch are the most recognized possible predisposing factors for suprascapular nerve entrapment.
Aims: The present study was intended to document and compare the incidence of ossification of STSL in dry scapulae, to elucidate the reasons of ossification of STSL and to discuss its clinical significance.
Materials and methods: The present study was carried out on 122 (Right 64, Left 58) dried human scapulae of unknown sex.
Results: Macroscopic examination revealed that 4.92% scapulae had completely ossified STSL and 10.65% had partial ossification.
Conclusion: Incidence of ossification of STSL varies in different populations. Ossification may be influenced by age, mechanical load on ligament, sex and genetic factors and can be one of the risk factors for suprascapular entrapment neuropathy. So these facts should be considered while dealing with a case of painful shoulder.
Ossification, Enthesis, Scapula, Superior transverse scapular ligament, Suprascapular nerve entrapment.