Just had an operation on herniated disc l4/l5 and still same symptoms on left leg as before op i.E. Numbness and scrapping feeling, is this normal?

See below. If the nerve was heavily trapped the symptoms can persist as the nerve tries to heal. Talk to your surgeon about your problem.
Maybe. When a nerve is squeezed for a long time it might take quite some time for numbness to go away. Usually the pain goes away quickly.

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