A person with a temporary disability due to an accident or injury is protected by Section 804(f)(3)(A) of the Fair Housing Act. The general rules are:
A Landlord must make reasonable accommodations for disabled persons.
Reasonable Accommodation means: A housing provider must make reasonable accommodations in rules, policies, practices or services, when such accommodations may be necessary to afford a person with a disability equal opportunity to use and enjoy a dwelling. In order to get a change in a rule, policy, practice or service, the tenant must request it.
A housing provider must permit, at the expense of the person with a disability, reasonable modifications of existing premises occupied by such person, if the modifications are necessary to allow the person full enjoyment of the premises.
There are other caveats to the general rules referenced above.