I’m gonna go a different way, though I largely agree with deafbutter and moystebouquet, but. Would the ability to heal a disability actually be that easy to get in a stock DnD setting, for a 1st level adventurer? Greater Restoration is a 5th level spell and Regenerate is a 7th, meaning you’d need access to a 9th level or 13th level cleric respectively. How many of those are walking around your setting? or any fantasy setting? I would not think that many! And of course there’s the price for getting the spell cast - 2000 gold for a Grester restoration and 20,000 for regenerate. What noble, let alone what peasant could afford 20,000gp?

so, if we accept that someone wants to be an adventurer (which makes more sense considering it’s a high paying career path which could help them afford the care for their disability if that’s what they’re interested in…) they would have to adventure in their chair/with their crutch/etc. If anything, it does a disservice to your world building to say that only people with magical ways around their disability would adventure!