666 INFLAMMATION OF TENDON, ETC., OF GLUTEUS MEDIUS MUSCLE. 
Eecent contusions and displacements, if accompanied by severe pain, 
are treated with cold applications. If, after a week, there is no marked 
improvement, a bichloride or biniodide of mercury blister may be 
resorted to. Setons and “issues ” are also useful, though their efficacy 
chiefly depends on the rest which they enforce. 
INFLAMMATION OF THE TENDON AND TENDON 
BURSA OF THE GLUTEUS MEDIUS MUSCLE. 
BURSITIS GLUTA3I MEDII. S. TROCHANTERICA, 
Anatomy. The M. glutseus medius, which represents an extension of the 
M. longissimus dorsi, is in the horse provided with two tendons, one of which 
becomes attached to the upper trochanter of the femur, the other passes over 
the ridge in front of the great trochanter, forming on its cartilaginous surface 
an extensive bursa, and becoming attached below to the surface of the crest. 
In boises, inflammation of the tendon and of its sheath on the convexity of 
the trochanter produces a peculiar lameness, which was first described by K. 
Gunther, and afterwards by Renard and others. In England the disease has 
been called trochanteric lameness (Williams), or false hip-joint lameness. 
Causes. This disease, which is only occasionally seen in horses, may 
be caused by bruising or violent strain of the tendon or its sheath. 
Bruises are produced by falls, by collisions with the carriage-pole, by 
blows with heavy bodies, strains resulting from heavy draught-work 
and by falling on the hind limb, as often happens when the animal 
catches the heel of one of the hind shoes in the rack-chain. Sudden 
reining-up is also said to produce it. Horses with sloping quarters and 
slight muscular development seem predisposed to such injuries. 
Course. The disease consists in a bursitis or tenositis, acute or 
chronic ; the tendency always being towards a chronic condition, but 
the issue depending to some extent on the initial injury, and on the 
treatment adopted. Under appropriate treatment, lameness may dis¬ 
appear in four to six weeks ; but if neglected, and especially if the 
primary injury be severe, the condition becomes chronic, and the animal’s 
usefulness is lost. 
The prognosis depends chiefly on the stage attained and the severity 
of the disease. When lameness is recent and slight, and the animal can 
be rested, there is good hope of recovery, but this is less in heavy draught- 
horses and in riding-horses than in such as are occupied in the lighter 
forms of draught. Marked wasting of muscle, the existence of swelling, 
and severe or chronic lameness render prognosis doubtful; and where 
there is periostitis and exostosis, with abrasion of the cartilaginous 
covering of the trochanter, there can be little chance of recovery." The 
suggestion that the bursa sometimes communicates with the hip-joint, 
