How to Perform Ritual Purity for Those with Casts

Question:
Is dry ablution obligatory for a person with a broken bone, in addition to ablution and the full ritual bath? Is it obligatory to perform ritual purity before applying the cast, or not?

Answer:
One who is unable to wash some of his limbs due to a fracture or illness; his case is examined. If he is able to wipe over the cast, he should wash the cast and wipe over it; this suffices in place of dry ablution. He wipes over the cast, and that is sufficient, even if he applied it while in a state of impurity, because ritual purity is not a condition for casts according to the correct opinion. So if he has a cast on his hand, or on his forearm, or on his face; he wipes over it, and that is sufficient.
As for one who is unable to wipe over it because water harms him and he fears the harm of water; if he performs ablution and it dries, he strikes the earth with his hands and wipes with his palms, intending the area he left unwashed. Likewise, in the case of major ritual impurity, if he has major ritual impurity and performs the full ritual bath on his body, wiping over the cast on the affected area is sufficient.
If he is unable to wipe, and fears wiping, and wiping harms him; because the cast is weak, or water reaches from behind it, or something similar; he performs dry ablution intending major ritual impurity, and that is sufficient.