I punched a wooden power pole. my knuckle hurts?

Of course it does : The question is, did you break something? You really need a physical exam to have a good idea. X-rays are ideal. Is there swelling or deformity? Is there pain when you push on the bones? Are you limited in function? Most fractures heal without splinting, but non-union is a risk. You may also develop deformity of the bone if it heals on its own, which could limit function..,get checked

X Ray : Congrats! You bought yourself an X-Ray. We see this all the time and the pole usually wins. Head to an urgent care.