MORPHOLOGICAL STUDY OF ANTERIOR INFERIOR ILIAC SPINE IN A SAMPLE OF HEMIPELVIS FROM SOUTH INDIAN POPULATION

Abstract

Objective: Abnormal morphology of anterior inferior iliac spine (AIIS) contributing to repeated femoroacetabular impingement, leading to functional limitation at the hip joint and chronic groin pain has been reported recently. The present study examines the prevalence of the morphologically different AIIS in south Indian population. Methods: This was an observational and cross-sectional study conducted by analyzing dry hemipelvises of South Indian population at the Department of Anatomy of a tertiary care teaching hospital between July 2022 and June 2023. The specimens were analyzed independently by first and second authors, to determine the prevalence of different morphologies of AIIS based on Morales-Avalos classification. Data were entered into Microsoft Excel and analyzed. Results: A total of 150 hemipelvises were analyzed. Type 2A was observed in 46.42% (n=65/140). Abnormal morphology was seen more on the left side hemipelvises (41.42%, n=58/140). Conclusions: Type 2A of AIIS was more prevalent in South Indian population and more prevalent on the left side hemipelvis. Demonstrating the different morphologies of AIIS helps in understanding their role in subspine hip impingement.