Background:One of the most common complaints is spinal pain, especially low back pain. The present study was conducted to assess canal stenosis of herniated lumbar disc with magnetic resonance imaging. Materials & Methods:80 patients with lumbar disc herniation syndrome of both genders were kept in group I and group II (80)had control subjects. In group I, patients underwent straight leg rising test (SLRT). A positive SLRT at 40° or less was suggestive of root compression. Results: Out of 80 patients, males were 45 and females were 35. In age group 0-20 years AP diameter of spinal cord at L3-L4 in group I was 12.5 mm and in group II was 12.7 mm, in age group 21-40 years was 12.2 mm and 12.3 mm respectively, in age group 41-60 years was 12.6 mm and 12.3 mm respectively and >60 years was 12.8 mm and 12.7 mm in group I and II respectively. The difference was non-significant (P> 0.05). In age group 0-20 years AP diameter of spinal cord at L4-L5 in group I was 11.5 mm and in group II was 15.7 mm, in age group 21-40 years was 11.2 mm and 15.3 mm, in age group 41-60 years was 11.9 mm and 15.5 mm and >60 years was 11.7 mm and 15.8 mm in group I and II respectively. The difference was significant (P< 0.05).AP diameter of spinal cord at L5- S1 in age group 0-20 years in group I was 11.3 mm and in group II was 16.5 mm, in age group 21-40 years was 11.2 mm and 16.3 mm, in age group 41-60 years was 11.7 mm and 16.9 mm and >60 years had 11.4 mm and 16.4 mm in group I and II respectively. The difference was significant (P< 0.05). Conclusion: The age range of 21 to 40 years showed maximum disc prolapse. The largest number of herniations was observed to occur at the L4 and L5 levels.