Background: Lumbosacral joint carries whole body weight and transmits it to tibia. As the 5th Lumbar Vertebra transits into first Sacral Vertebra, fifth Lumbar Vertebra may be fused on one or both sides to the first Sacral Vertebra, Condition known as ‘Sacralisation’.

Aim: To find the frequency of sacralisation of 5th Lumbar Vertebra in South Punjab Pakistani Population.

Methods: It was a descriptive observational study conducted in Anatomy Department Quaid-e-Azam Medical College, Bahawalpur. This was descriptive observational study conducted on cadaveric sacra collected in last 7 years. 86 dry Human adult sacra of known sex were observed and results were noted for Sacralisation of Lumbar Vertebra.

Results: Out of 86 cadaveric Sacra, Sacralisation was found in 12(14%). Out of these 12, 8 Sacra showed complete Sacralisation while 4 Sacra showed incomplete Sacralisation.

Conclusion: Sacralisation of 5th Lumbar Vertebra is common (14%) in cadaveric sacra of South Punjab, Pakistani Population.

Key words: Lumbar Vertebra, Sacralisation, Cadaveric, L5 (5th lumbar vertebrae), S1 (1st Sacral Vertebrae).