Hi there!
L5/ S1 PLiF is unlikely to be directly related to pain and numbness in the hands, though vascular/ clotting issues or anesthesia related causes may need to be ruled out aside causes unrelated to the surgery. You may consider getting this evaluated by your treating doctor or a primary care physician for an accurate diagnosis and appropriate management.
Hope this is helpful.
Take care!
Thank you so much for listening and your advise. I will discuss with my doctor. I am actually noticing some improvement.