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Hi this is Dr. Hill. I suspect that your kitty may have thrown a blood clot to her spinal cord. This is called a fibrocartilagenouse embolus (FCE). This would explain rear limb weakness and no evidence of pain. Is she able to walk on her own?
If they are stiff and cool to the touch then she may have a blood clot that has disrupted blood flow to her back legs. Is she home with you or still at the hospital?
Pretty unusual that it would not be related to the surgery. I am looking through the literature to see if this have been reported before in cats.
Time. Usually the body is able to reroute the blood flow and there is return of function. Not always, though. I would ask them if she has good blood flow to her back legs. It worries me that you said they were stiff.
So most of the information I have found is about neurologic condition post operatively like seizures. Nothing about loss of function. Sorry you and your kitty are dealing with this. If you do decide to bring her home for nursing care, you will need to set up an area for her with a padded bed, food and water, but limited space while she is recovering. She will also likely need to have her bladder expressed or be positioned in her litter box to allow her to urinate/defecate. This thread will stay open for several days even after you post a rating, so please let me know what you find out when you meet with them tomorrow.