Abstract— Study of variation of sacral hiatus in dry bone is important as it determines access of sacral hiatus for caudal epidural anaesthesia and analgesia. So this descriptive observational study was conducted on 80 adult sacrum bones were studied at department of Anatomy, SMS Medical College, Jaipur with the aim to examine Morphometry of Sacral hiatus including shape, length, A-P diameter at apex and transverse width at base. Most commonly found shape of sacral hiatus in this study was inverted U/V shape. Length of sacral hiatus ranged 6 to 43 mm with more than half cases having length between 10-20 mm. Most sacrum (81.25%) had anterio-posterior diameter of 4 to 8 mm. Half of the sacrum had transverse width at sacral cornua between 9-13 mm. It can be concluded that anatomical variations in sacral hiatus are cause of caudal epidural anaesthesia failure and procedure related complications. Understanding these variations may improve success of caudal epidural anaesthesia and decrease incidence of complications. So this study will be useful to increase success rate of epidural anaesthesia.
Keywords— Sacrum, Sacral hiatus.
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