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IJMRHS. 2014; 3(1): 115-119


Morphometric study of the sacral hiatus in Nigerian dry human sacral bones

Ukoha Ukoha U, Okafor Joseph I, Anyabolu Arthur E, Ndukwe Godwin U, Eteudo Albert N, Okwudiba Nchedo J.

Abstract
The sacrum is a large triangular bone formed by the fusion of the five sacral vertebrae and forms the caudal region of the vertebral column. Aims: This was aimed at studying the morphometry of the sacral hiatus noting its anatomical variations that is useful in caudal epidural anaesthesia. Materials and Methods: Eighty three intact adult sacra of unknown sex were measured with vernier callipers and the various shapes of the sacral hiatus were also noted. Results: The findings revealed that inverted U (48.2%) was the most predominant shape; followed by inverted V (34.9%), dumbbell (4.8%), bifid (4.8%) and irregular (4.8%). The mean anteroposterior diameter at the apex was 5.52 1.89mm. The mean length of the sacral hiatus was 20.05 9.22mm and the transverse width at base of hiatus was 12.35 3.12mm. There was complete spina bifida in 1.2% and absence of sacral hiatus in another 1.2%. Conclusion: The knowledge of anatomical variations of sacral hiatus is important in the administration of caudal epidural anaesthesia in the studied population and may help to reduce its failure rate.

Key words: Sacral hiatus, caudal epidural block (CEB), sacral vertebra.



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