Is it permissible to wipe over an artificial leg, like a cast?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: Is it permissible to wipe over an artificial leg, like a cast?

Answer:
No, an artificial leg has no ruling. However, if some part of the leg remains, the remaining part must be washed. For example, if some of the heel remains, the rest is washed. But if it was amputated at the joint of the ankle and nothing remains, then he is not required to wash the leg; the washing of the leg is dropped from him because its place is no longer there.