Introduction:Lumbar canal stenosis is reduction in the diameter of the spinal canal or neural foramina. Neurogenic claudication is the most common complaint of these patients. Foraminal decompression is incomplete in regular decompressive procedures. Aims and Objectives:This study aims to find out the clinical and radiological improvement in TLIF with autologous bone graft for lumbar canal stenosis. Methodology:A prospective cohort study of 39 patients with diagnosed severe lumbar canal stenosis graded clinically with Claudication distance, ODI & JOA scores &radiologically according to MRI grading underwent Transforaminal Lumbar Interbody fusion by the same group of similarly trained surgeons and were followed up for 1.5 years and assessed for improvement in Claudication distance, JOA and ODI scores clinically at 1,3,6 & 12 months and radiologically were assessed with regular post op x-rays at 1 month and 1 year and fusion rate was assessed with the help of Birdwell classification for fusion. Results: Out of the 39 patients 17 were females and 22 were males with mean age of 51 years. The claudication distance improved from 0.05±0.025 kilometres preoperatively to 1.78±0.47kilometres at 1 year postoperatively. The ODI score improvement from 79.64±2.91 preoperatively to 24.66±2.95 at 1 year postoperatively. The JOA scores improved from 4.87±0.76 preoperatively to 10.87±0.97 postoperatively at 1 year. Conclusion:There is considerable improvement in the patients clinically as seen with the CD, ODI and JOA scores postoperatively. The maintenance of disc height and foraminal height postoperatively co-related well with the clinical improvement seen with the patients.