Morphometric evaluation of suprascapular notch and superior angle of the scapula using three-dimensional computed tomography in the Indian population

Abstract

Background: Among the various aspects of scapular anatomy, the suprascapular notch has gained attention as its anatomical variation is a predisposing factor for compression of the suprascapular nerve in this region, potentially impacting orthopedic surgery. This study aims to investigate the morphology of suprascapular notch (SSN) and its variation with age and sexual dimorphism. It also seeks to classify and correlate the superior angle of the scapula with the SSN in the Indian population. Methods: A retrospective analysis of 360 computed tomography scans of scapulae of 180 adults was conducted. The morphology of SSN was classified according to Rengachary's classification (types I-VI), and the maximum depth (MD) and maximum width (MW) of SSN were measured. The superior angle of the scapula was classified based on morphological characteristics. Results: Type I SSN was the most prevalent, suggesting lower susceptibility to suprascapular nerve entrapment. Males had significantly greater MD than females. Identical types of SSN and superior angles on both sides of the scapula were statistically significant, though variations on each side were also observed. There was no significant difference in age. The superior angle of the scapula was classified into four types: Hilly, mountain peak, crescent, and chimney, with the hilly type being the most common. No correlation was found between SSN and the superior angle. Conclusion: These findings may provide a comprehensive understanding necessary for accurate diagnoses of related abnormalities and for performing safe and effective endoscopic and open surgical procedures in the suprascapular region.

Keywords

• The superior angle of the scapula
• Suprascapular notch
• Computed tomography
• Rengachary's classification
• Suprascapular nerve