Hi welcome to HCM.
You need not go under any operation . There is no any injury
due to trauma. All changes are age related known as degenrative changes.
There is mild bulging at L4-L5 level means intervertebral disc
has migrated posteriorly in very mild porportion. Similar changes are there at L5-S1 intervertebral disc , however at this level origin of one of the nerve
is mildly compressed . It may cause tingling
in left lower limb.
In short , no need to to worry too much. If you are having symptoms please consult orthopaedician.
Hope i have addressed your query.