LAUSR

Address for Correspondence: Nutan Nalini Bage, Department of Anatomy, Pondicherry Institute of Medical Sciences, Ganapathychettikulam, Kalapet, Pondicherry – 605014, India. Mobile number +919487992716 E-Mail: [email protected] Background: The scapula is a large, flat, triangular bone which lies on the postero-lateral aspect of the chest wall Suprascapular nerve entrapment depends on the size and shape of suprascapular notch. Purpose of the study: Aim of the present study is to classify SSN based on morphometry according to Michal Polguj and to obtain a safe zone which would be useful to avoid iatrogenic nerve lesion and to verify the reliability of the existing data for the management of entrapment neuropathy. Materials and Methods: Study included 60 dried human scapulae obtained from the Department of Anatomy, Pondicherry institute of medical sciences. Three measurements were defined and collected for each SSN, Maximum depth (MD), Superior transverse diameter (STD) and Middle transverse diameters (MTD) based on which suprascapular notch was classified. Results: In the present study type IIIC was the most common type with 83.3%. The mean of maximum depth was 6.87mm in type I whereas in type III it was 5.3mm. The mean of STD was 1.98mm in type I whereas in type III it was 10.03mm. The mean of MTD was 2mm in type I whereas in type III it was 6. 56mm.The distance between the SSN and the supraglenoid tubercle (AB) and the distance between posterior rim of glenoid cavity and the base of scapular spine (CD) were larger in Type V followed by type IV, III and Type I. The mean distance of AB for all the types were 24.79mm and for CD mean was 13.07mm. Conclusion: Our study with morphometric variations of SSN may be helpful for the surgeons performing SN decompression especially by means of endoscopic techniques and measurements of safe zone may be helpful in the preoperative evaluations of patients with suprascapular neuropathies.