Background: Sacral Index is the most important parameter in assessing the sexual dimorphism.
Materials and Methods: A total of 42 dry adult human sacral bones of known sex (19 – female sacra; 23-
male sacra) collected from Anatomy Department, Santhiram Medical College, Nandyal. The sacral length
measured from the promontory to the middle of antero-inferior margin of last sacral vertebra. The sacral
breadth measured from the lateral most points of ale of sacrum. The sacral index (SI) is calculated and
Results: We noted the mean sacral index 101.142 2.148 in male sacra, and 103.668 2.271 in female sacra
with significantly higher sacral index in female sacra than male sacra in the present study.
Conclusion: Our study acknowledges the importance of sacral index and its significance can be useful in
Breadth, Lengt, Sacral index.