De Medicina

17 The hand also may be dislocated in all four directions. If it has slipped out backwards, the fingers cannot be stretched out; if forwards, they do not bend; if to either side, the hand is turned in the opposite direction either towards the thumb or towards the little finger. It can be replaced without difficulty. The hand, supported on a hard and resistant object, must be stretched one way, the forearm the other, in such a way that the hand is palm downwards if the bone has slipped out backwards, palm upwards if forwards; if the displacement is inwards or outwards, upon the side. When the sinews are sufficiently stretched, the surgeon's hands push back the bone, in the opposite direction to the side to which it has slipped. Where

18 In the palm also bones are sometimes moved from their places, either forwards or backwards; for they cannot move sideways because of the bones on either side. There is but one sign, and that common to all, a swelling over the displacement, a hollow at the spot from which the bone has receded. But without extension the bone is returned into its place imply by firm pressure with a finger.