The prognosis is somewhat grave, for in case of suppuration the insertions of tendons and fascia into the summit of the trochanter may become necrotic.
Treatment. The first point is to supply the animal with ample clean bedding. The swelling may be repeatedly blistered. If considered necessary, a puncture may be made under antiseptic precautions, the fluid drawn off, and the cavity washed out; but it is better to avoid opening the parts with a bistoury, on account of the danger of suppuration and of necrosis of the tendons and aponeurotic tissues in the neighbourhood.
HYGROMA OF THE STIFLE.
Hygroma of the stifle or of the patella appears under the skin, outside the external ligament of the femoro-tibial articulation. It usually follows repeated abrasion when lying down, especially if the paving of the stalls is rough or irregular.
The swelling varies in size from a hen’s egg up to that of a child’s head, and exhibits fluctuation throughout.
Fig. 27.—Capped hock.
The prognosis is somewhat serious, for here again complications may result from necrosis of neighbouring aponeuroses.
Some authors recommend passing a seton dressed with some irritant material through the swelling. Aseptic puncture, however, seems preferable, followed by washing out of the cavity and the application of a blister.