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1.There is a disc between the
vertebral bodies which are normally seen well hydrated.
2.Due to the age related / hard working nature / repeated movements due to work related - they loose hydration and cause narrowing and bulging.
3.In your case at the level of L5-S1 the disc is seen protruded with peripheral tear.
4.That bulge is seen causing the pressure effect on the
thecal sac where spinal chord lies and ends at L1-2 level.
5.In this case exercise is treatment of choice, followed by
physiotherapy if required. Only in advanced stage one needs operative / interventional treatment.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888