EXCISION OF THE HIP-JOINT.--The question as to the propriety of performing this operation in any case is still debated by some surgeons, and the selection of suitable cases for the operation is greatly modified by the varying opinions of the different schools of surgery. Enough here to describe the method of operating, and the amount of the bone which is to be removed. As in the shoulder-joint, the head of the femur is much more liable to disease, and, as a rule, much earlier attacked than is the acetabulum, but unfortunately the acetabulum does eventually become affected also in probably a much larger proportionate number of cases than the glenoid. Caries of the head, neck, and trochanters of the femur is a very common disease in this variable climate, and frequently connected with the strumous taint. After much suffering, abscesses form and discharge, giving considerable pain, and often end by carrying off the patient. As a result of the abscess and destruction of the ligaments, the head of the bone is apt to be displaced, and under some sudden muscular exertion or involuntary spasm, consecutive dislocation of the femur (generally on to the dorsum ilii) very often occurs. In such a case the operation of excision of the head of the femur is by no means difficult, and not excessively dangerous, especially in young children. _Operation._--It is hardly necessary, or indeed possible, to lay down exact rules for the performance of this operation, in so far as the external incisions are concerned, for the sinuses which exist ought in general to be made use of. When the surgeon has his choice, a straight incision (Plate II. fig. A.), parallel with the bone, extending from the top of the great trochanter downwards for about two inches, and also from the same point in a curved direction with the concavity forwards, upwards towards the position of the head of the bone (see diagram), will be found most convenient. The incisions should be carried boldly down to the bone, which will often be felt exposed and bathed in pus, any remains of the ligamentous structures must be cautiously divided with a probe-pointed bistoury, and then by bringing the knee of the affected side forcibly across the opposite thigh, with the toes everted, the head of the bone is forced out of the wound. The head, neck, and great trochanter should be fully exposed, and the saw applied transversely below the level of the trochanter, so as to remove it entire. If this is not done, it prevents discharge, protrudes at the wound, and besides this it is almost invariably diseased along with the head. Chain saws are quite unnecessary, it being in most cases easy to apply an ordinary one to the bone, if it is properly everted.