SHAFAQNA – The Grand Ayatollah Makarem answered a question about performing Wudhu by a person whose hands do not move.
Question: I am disabled and have no feeling or movement in my hands, what am I supposed to do at the time of performing Wudhu?
The Grand Ayatollah Makarem: Place your face under the tap water, and also if you can place your hands under the tap water, and if this is difficult, ask someone for help, and if that is not possible or difficult, the amount that you are able, will suffice.
Source: PERSIAN SHAFAQNA