Thanks for the reply. I have been observing him all this week and he seems to be back to normal. He did allow me to touch him and pick him up. I think he probably just sprained it.
It's hard to say. You describe an incident that can involve anything from a simple sprain, a ligament tear, to a hairline fracture.
Heck, there can even be a dislocation that popped back in immediately. As you pointed out, you can only wait and see what happens, assuming this kitty refuses to be touched.