I’m fused at l5-s1 over a year ago and having new l5-s1 dermatome neuropathy?

I’m fused at l5-s1 over a year ago and having new l5-s1 dermatome neuropathy.. Last xray the hardware was fine. No injury. Woke up with a numb foot and leg and ER advised it’s the l5-s1 nerve dermatome. I have no disc there as it was removed. What could cause the new symptoms to appear literally over night?

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