إِذَا افْتَصَدَ أَوْ جُرِحَ أَوْ كُسِرَ عُضْوُهُ فَشَدَّهُ بِخِرْقَةٍ أَوْ جَبِيرَةٍ، وَكَانَ لَا يَسْتَطِيعُ غَسْلَ الْعُضْوِ وَلَا يَسْتَطِيعُ مَسْحَهُ، وَجَبَ الْمَسْحُ عَلَى أَكْثَرِ مَا شَدَّ بِهِ الْعُضْوَ
If an injured or fractured limb is covered and washing the limb or directly wiping the injured area cannot be done without harm, wipe over the majority of the covering. This is a medical concession tied to inability or harm, not convenience.