I say, and with God's success: It is required to wipe over the splint instead of washing the injured member or wiping it. If one does not wipe over it, their ablution is invalid; as narrated by Thawban  who said: "The Messenger of God  sent a military expedition and they were affected by the cold. When they returned to the Messenger of God , he ordered them to wipe over the bandages and the socks," and this is the opinion of the two companions and it is the fatwa. Abu Hanifa said: He is sinful for leaving it, but his ablution is valid. It has been reported that he returned to the opinion of the companions. And from Ali ibn Abi Talib  who said: "One of my forearms broke, so I asked the Prophet  and he ordered me to wipe over the splints," in Sunan Ibn Majah 1: 215, Musnad Al-Rabi' 1: 62, Sunan Al-Bayhaqi Al-Kabir 1: 229, and Sunan Al-Daraqutni 1: 226. And from Jabir  who said: "We went on a journey and a stone hit one of us and injured his head, then he had a wet dream and said to his companions: Do you find for me a concession for performing tayammum? They said: We do not find a concession for you while you can use water, so wash yourself and he died. When we returned to the Prophet , we informed him of that. He said: They killed him, may God kill them! Why did they not ask when they did not know? The cure for ignorance is to ask. It would have sufficed him to perform tayammum and to press or bandage his wound with a cloth and then wipe over it and wash the rest of his body," in Sunan Abu Dawood 1: 93, Sunan Al-Bayhaqi Al-Kabir 1: 277, and Sunan Al-Daraqutni 1: 189. And from Abu Umamah : "When Ibn Qum'ah struck him on the day of Uhud, I saw the Messenger of God when he performed ablution, he removed his bandage and wiped over it during the ablution," in Musnad Al-Shamiyeen 1: 262. And because the hardship in this is greater than the hardship in removing the sock, it was more appropriate to follow the ruling of wiping. See: Sharh Al-Wiqayah p. 119, Nihayat Al-Murad p. 401, and God knows best.