PREVENTION, SYMPTOMS AND TREATMENT 247 



bursitis. Lameness, abduction of the leg, with local tenderness and 

 swelling, are the chief characteristics. 



3. At the knee or carpus (thoroughpin of knee). Of the 

 common sheath of the flexors behind, from four inches above the 

 carpus to the middle third of the metacarpus. Oblong swellings 

 are seen on each side of the tendons. In front of the carpus are 

 seen swellings corresponding to the distended sheaths of the ex- 

 tensor digiterum communis, carpi radialis, and oblique extensor; 

 and at the outside and above the carpus a swelling of the sheath of 

 the extensor suffraginis. 



4. At the fetlock (windgalls). Teno-synovitis of the common 

 or large sesamoid sheath of the flexor tendons (sesamoiditis) be- 

 ginning four inches above the fetlock joint and passing down over 

 the sesamoid bones and ligament, to become attached to tendons be- 

 hind the cannon bone and above the fetlock. These also occur in 

 the hind limbs. 



5. In front of the fetlock. A swelling as large as an egg on 

 both sides of the extensor pedis. 



Posterior Limb. — 1. At the trochanter. This is also strictly 

 inflammation of the bursa under the attachment of the large gluteus 

 to the convexity of the trochanter. Destructive changes of cart- 

 ilage, bone and tendon occur as in navicular disease. Lameness 

 with swelling and crepitation over the trochanter, and, later, wast- 

 ing of the muscles of the quarter, occur. 



2. At the hock, or tarsus. Here the sites of teno-synovitis are 

 five: (a) Thoroughpin of hock, a swelling reaching up and on 

 each side of the perforatus from the point of the hock. The swell- 

 ings are about eight inches long and may be pushed through from 

 one side to the other. On the posterior internal surface — there are 

 two swellings (b) on the inner surface, and one on (c) the posterior 

 surface owing to teno-synovitis of the perforans. The tendon on 

 the inner surface is bound down at the tarsal groove so that the 

 swelling can only appear above and below. On the outside of the 



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