Abstract : Back pain is the leading cause of disability worldwide. Treatment options may be conservative or surgical and instrumentation with pedicle screws is the commonest method of stabilizing the spine. Correctly placing the pedicle screws is of paramount importance and the morphological characters may vary by region. This study aims to do a morphometric analysis of lumbar pedicles in Tamil Nadu population using CT of lumbar spine. 300 men and women aged 18-65 were studied with a single lumbar spine CT. The measured parameters were Pedicle isthmus diameter, Depth to the anterior cortex along the axis of the pedicle, Depth to the anterior cortex along the Midline of the vertebra, Pedicle offset from the spinous process, Transverse Pedicle Angle and Pedicle angulation compared to the vertebral body. The mean age of the subjects was 38.83±10.99 years, the mean height was 161.9 ±9 .93 cm and the mean weight was 59.94±11.32 Kg. Depth to the anterior cortex along the axis of the pedicle progressively increased from L1 to L3 and decreased in L4 and L5. Pedicle Isthmus diameter increased gradually from L1 to L5. The pedicle offset steadily increases from L1 to L5 vertebra. The SPA gradually increased from L1 to L2 then progressive decreased with caudal angulation at L5. The Transverse pedicle angulation increased from L1 to L5. The spine parameters of our population differ significantly from the previously described studies. Computed Tomography helps in understanding the morphology of the pedicles and decreases iatrogenic complications.