Book 7
5
There is a third kind of missile which at times has to be extracted such as a lead ball, or a pebble, or such like, which has penetrated the skin and become fixed within unbroken. In all such cases the wound should be laid open freely, and the retained object pulled out by forceps the way it entered. But some difficulty is added in the case of any injury in which a missile has become fixed in bone, or in a joint between the ends of two bones. When in a bone, the missile is swayed until the place which grips the point yields, after which it is extracted by the hand, or by forceps; this is the method also used in extracting teeth. In this way the missile nearly always comes out, but if it resists, it can be dislodged by striking it with some instrument. The last resort when it cannot be pulled out, is to bore into the bone with a trepan close by the missile, and from that hole to cut away the bone in the shape of the letter V, so that the lines of the letter which diverge to either side face the missile; after that it is necessarily loosened and easily removed. If the missile has forced its way actually into a joint between the ends of two bones, the limbs above and below are encircled by bandages or straps, by means of which they are pulled in opposite directions, so that the sinews are put on the stretch; the space between the ends of the bone is widened by these extensions, so that the missile is without difficulty withdrawn. In doing this care must be taken, as mentioned elsewhere, to avoid injury to a sinew, vein or artery while the weapon is being extracted by the same method which was described above.
