16 From what was said at the beginning of this book, it can be understood how the three bones, humerus, radius and ulna, meet together at the elbow. If the ulna which is connected to the upper arm slips away from it, the radius which is joined to the ulna is sometimes dragged with it, sometimes remains in position. The ulna can slip out in all four directions: but if it is dislocated forwards, the forearm is extended and cannot be flexed; if backwards, the forearm is flexed and cannot be extended, and it is shorter than on the opposite side; sometimes this causes fever and bilious vomiting. If the ulna has been dislocated outwards or inwards, the forearm is stretched but a little bent towards the part from which the bone has receded. Whatever has happened, there is one method of treatment which holds good not only for the ulna but also for all long bones which are connected at their articulation by a long head. Each limb is to be pulled in opposite directions until there is a gap between the bones. Then the bone which has fallen out of place is forced into the opposite direction from the position into which it has slipped. The methods of extension, however, are various according to the strength of the sinews, and the direction in which the bones have given way. And sometimes only the hands are used, sometimes other means have to be applied. Thus if the ulna has slipped for-
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wards, extension by two hands, at times aided by straps, is sufficient; then some round object is to be put in front of the biceps and the ulna suddenly flexed over it towards the upper arm. But in other forms of displacement, it is best to stretch the forearm as described above for fracture of the elbow and then to replace the bones. The rest of the treatment is the same as in all other cases; only the dressing must be taken off more quickly and more often and there must be more plentiful fomentations with hot water, and more prolonged rubbing with oil, nitre and salt. For whether the elbow remains out of place or is put back again, callus forms more quickly round it than round any other joint, and if this callus has grown through resting the joint it prevents flexion afterwards.
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
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the dislocation is forwards or backwards, some hard object is placed upon the hand, and pressed on the projecting bone, and by this additional force the bone is more readily pushed back into place.
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.
19 Now the fingers can be dislocated in almost as many ways as the hand and the signs are the same. But in stretching these less force is required, for the joints are shorter and the sinews less strong. They only need to be stretched out on a table, when the dislocation is forwards or backwards; then reduction is made with the palm of the hand; but when the displacement is to one side, by means of the surgeon's fingers.
20 Since I have described the above, I can be held also to have described displacements in the legs: for in this kind of accident also there is some similarity between the thigh and upper arm, between the tibia and ulna, between the foot and the hand. But there are also some special points to note about the legs.
The thigh-bone may be moved out of place in all four directions, oftenest inwards, next outwards, very rarely forwards or backwards. If it has been dislocated inwards, the leg is longer than the other, and is bowed; for the point of the foot looks outwards;
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if outwards, the leg becomes shorter and knock-need, and the foot is inclined inwards; the heel in walking does not touch the ground, but only the extreme end of the sole; the leg in this case supports the rest of the body better and more uprightly than in the other and there is less need for a stick. If forwards, the leg is extended and cannot be bent; as far as the heel the injured leg is the length of the other one, but the extremity of the sole is less bent forward; and in this case there is marked pain, and very often the urine is suppressed. When the inflammation and pain have subsided, the patients walk fairly and the whole of their foot touches the ground. If backwards, the leg cannot be stretched out, and is shorter; when the patient is standing the heel in these cases too cannot touch the ground. But the great danger with regard to the thigh is that it is difficult to replace, or, after replacement, slips again out of position. Some hold that it always does so; but such renowned authorities as Hippocrates and Diocles and Phylotimus and Nileus and Heracles of Tarentum have related that they had completely restored such cases; nor would Hippocrates, Andreas, Nileus, Nymphodorus, Protarchus, Heraclides, and a certain smith as well, have invented so many sorts of instruments for making extension on the thigh after this accident, if it had been all of no use. But although that opinion is a false one, there is this truth in it: since the ligaments and muscles there are very strong, if they retain their strength they scarcely allow of replacement; if not, they do not keep in place afterwards. Replacement, then, is to be attempted; and if the limb is weak it is sufficient to stretch it by straps, one from the groin,
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another from the knee; if stronger, the assistants will have more purchase if they have knotted the straps around long poles; and if after pressing the lower ends of the poles against firm supports, they have drawn the upper ends towards themselves with both hands. Even more forcible pressure can be exerted by stretching the limb over a bench, at either end of which is a windlass to which the straps are attached; when these are rotated as in a winepress, it is possible, by continuing to do this, even to rupture the ligaments and muscles, and not merely to stretch them. Now the patient is to be laid upon this bench, on his face or back or side, so that that part is always the higher into which the bone has slipped, and that from which it has receded the lower. When the sinews have been stretched, if the bone comes forwards, some round object is placed over the groin and the patient's knee must be pulled back over it with a jerk, in the same way and for the same reason for which this was done in the case of the forearm; as soon as the thigh can be bent up, the bone is in place. In the other cases, when the bones under extension have receded a little from each other, the surgeon should force the projecting part back, whilst an assistant presses the hip in the opposite direction. When the bone is replaced nothing further need be done, but the patient must be kept in bed for a rather long time or the thigh may become displaced again on moving while the sinews are still relaxed.