ANATOMICAL BASICS AND VARIATIONS OF THE SCAPULA IN SOUTH INDIAN POPULATION

Abstract

Introduction: Morphology of suprascapular notch (SSN) and measurement of safe zone for the approach of suprascapular nerve is associated with suprascapular nerve entrapment neuropathy. For better knowledge about different shape and measurement of safe zone for suprascapular nerve distance is important for the clinicians in understanding the source of the entrapment neuropathy and avoiding the nerve injury during operative procedure. Aim: The aim of the present study is to find out the morphology of suprascapular notch and measurement of safe zone for the suprascapular nerve distance in Indian dry scapula. Materials and methods: The present study was carried out in 150 adult dried human scapulae of undetermined sex in Indian population. The following parameters were measured, 1. Shape of suprascapular the notch. 2. Measurement of safe zone for the suprascapular nerve distance. Results: Out of 150 scapulae, 76 (51%) were shallow U shaped notch, 32 (21%) were deep U shaped notch, 10 (7%) were J shaped notch, 12 (8%) were V shaped notch, 12 (8%) showed absence of notch, 8 (5%) showed complete foramen. The mean value of distance between the suprascapular notch and the supraglenoid tubercle (SGT) were 3.10±0.32. The mean value of distance between the spinoglenoid notch (SGN) and the posterior rim of glenoid cavity (PGC) were 1.55±0.23. The mean value of distance between the suprascapular notch and the spinoglenoid notch were 2.09±0.29. Conclusion: This study will be useful in understanding the importance of suprascapular notch in causing entrapment neuropathy and safe zone distance is of surgical importance in avoiding injuries to the suprascapular nerve during shoulder surgical procedures.