Neuroscience is considered one of the "cognitive sciences" and this site encourages expert level questions, so anything involving the brain and behavior should be welcomed here. Physical medicine is a bit of a edge case since real world treatment options probably aren't well known to this community. But since the literature on nociception and motor cognition should be well known to the expert community, I imagine these questions should be relevant and answerable.
You should prepare yourself for answers that come from a more theoretical viewpoint, as the site should attract far more PhDs than MDs. Likewise, your questions will be better regarded if couched in academic terms rather than doctor jargon.
I do hope you'll stick around the (eventual) site, as your expertise is likely of great import to many people here. Off the top of my head I can think of 10 questions about brain trauma that would greatly benefit from someone with actually experience working with brain damaged people.
While I imagine the up and coming medicine proposal would eventually yield better answers to any questions of a more clinical nature, the cognitive sciences site should still consider any such questions as on topic.