The melacha of hotza’ah (carrying) (part 5.5 – abridged)MBY 301:19-22 [Based heavily upon Kitzur Shulchan Aruch: 84:6-9, “Metsudah” edition, with notes, translated and annotated by Rabbi Avrohom Davis]
6) A person who is shackled in chains may walk out with them on Shabbos.
7) One may not walk out in stilts (i.e. long poles with footrests) on which people walk through mud and water.
8) One may go out with plaster (Ed. a modern-day cast?) on a wound, because since it provides healing for the body (i.e. even if it only protects the wound), it is regarded as an ornament. (Note: Whether or not one may place the plaster on the wound for the first time on Shabbos is a separate issue, namely, healing on Shabbos. That is the subject of the very long siman 328.) May one wrap an additional piece of cloth around the plaster? It depends: if the cloth is inexpensive, such that it becomes insignificant relative to the plaster, then one may go out with the wrap as well. If the cloth is an article of value, e.g. a scarf, such that it will not become insignificant, it may not be worn outside. The fact that the scarf is being worn not in its usual way like a scarf, but rather as a protective layer to the plaster, renders the scarf as a burden. (Note: Footnotes #22-23 mention two lenient exceptions: a) if the scarf is needed to keep the cast from falling off, and b) if the scarf is placed directly on the wound and protects it.)
9) One may go out with cotton placed in the ear to absorb discharge, provided that it is inserted tightly, so that it will not fall out. Likewise, one may walk out with foot pads in one’s shoes, provided that they will not fall out.