252 VETEEINAEY STATE BOARD 



with a discharge of pus. This may cease and a new abscess form 

 in a different place, and so on until the whole cartilage is more or less 

 necrotic. Lameness is usually slight unless the pedal joint is 

 invaded. In long-standing cases, the wall is thrust outward and 

 ringed. 



Treatment: In the early stages, when the pain is slight and 

 the patient is able to work, antiseptic injections may be tried. 

 Caustic agents such as a 10 per cent, solution of zinc chloride or 

 silver nitrate, and corrosive sublimate may benefit. Formalin in a 

 10 per cent, solution may cause the discharge to cease. Operative 

 removal of the affected cartilage is usually necessary and is best 

 performed early. 



Give in detail Bayer's operation for quittor. 



Shave the hair from the coronary region up to the fetlock. Scrub 

 the parts with brush and soap. Apply an antiseptic pack and leave 

 for 24 hours. Use general ansesthesia. Apply a tourniquet above 

 the fetlock. Remove a crescent-shaped piece of horn from the area 

 over the cartilage. Make a corresponding incision through the sensi- 

 tive structures, about %^ inch within the incision through the horn ; 

 the ends of the incision are prolonged upward, dividing the coronary 

 band, etc., as high as the upper margin of the lateral cartilage. The 

 flap, thus outlined, is dissected away from the underlying cartilage, 

 and the latter is then removed, either wholly or in part, depending 

 upon the extent of the disease. Freely curette away all necrotic 

 tissue. Disinfect the wound and dust freely with iodoform. Suture 

 the flap, cover the surface with an antiseptic pack and bandage. 

 Leave this dressing in position for ten or twelve days if no great 

 pain is shown and no bad odor or discharge is given off. 



Give the symptoms and the treatment of chronic navicular disease. 



Symptoms: Supporting and swinging-leg lameness. Lameness 

 is increased by exercise, decreased by rest. Volar flexion of the 

 phalanges and extension of the foot. Tenderness to pressure over 

 the navicular bone and to forcible dorsal flexion. The use of 

 cocaine will aid in the diagnosis. When both feet are affected, the 

 last phase of movement is shortened and the limbs are carried stifSy 

 and rapidly forward. Sometimes the lameness disappears after 

 exercise but more often it is aggravated. A decrease in lameness 

 follows a long rest. Muscular contraction and hoof contraction 

 follow disuse. 



Treatment : In recent cases, a long rest in a box with peat moss, 

 tan-bark or soft clay, together with the application of wet swabs 



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