I think, like Spirite, there may be some arthritis issues going on...
Was he still trying to get close to the litter box (same area)??
A lower cut out box, he can get into may solve that issue.
Also x-rays of his hips and spine would be good, as he could have further injured something, and you wouldn't necessarily know it, but it could certainly keep him from moving easily...
Agree with Marcia...
He needs the areas he's used to, in the house, not the basement, you need to be able to keep an eye on him, and he needs to be as comfortable as possible at 15 years old!
The stairs are a nightmare for a cat with arthritis, or spinal injury...
Wishing you all the best!
"A Cat must have three different names:
An everyday family name; A particular name;
And the name but the Cat Himself Knows, and will never confess." T.S. Eliot
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