SPECIAL INJURIES OF BONES. 559 



on the inner and outer swellings. The accompanying cut may 

 enable any saddler to construct such an instrument, the spring 

 being made of good spring steel and covered with leather. 



DISTENTION OF THE SHEATH OF THE EXTENSOR TENDON IN 

 FRONT OF, THE HOCK. 



This causes a tense fluctuating swelling at the front and outer 

 side of the hock. It is rare and not usually injurious, but may 

 be treated like similar synovial swellings elsewhere, 



FRACTURE OF THE INNER MALLEOLUS. 



This consists in fracture of the bony prominence on the inner 

 side of the hock at its highest point It usually results from a 

 blow with the opposite foot in fighting flies. There is more or 

 less swelling of the part, with an unnatural mobility of the pro- 

 cess and in some cases distinct grating. It is not unfrequent 

 to have a wound in the skin and a flow of glairy synovia from 

 the opened joint In other cases, independently of fracture, 

 there is inflammation and enlargement of the bony eminence. 



Treatnmit. — Rest is imperative, as the fracture often impli- 

 cates the joint If synovia escapes use a sugar of lead lotion 

 (i oz. to I pt water and 60 drops carbolic acid), or even apply 

 a blister around the joint, leaving the space of an inch around 

 the wound untouched. In other cases rely on soothing 

 applications, followed by blisters when heat is diminished. Such 

 cases usually do well, even an open joint being harmless from 

 the wound being at its upper part. Even pieces of bone may be 

 taken out with portions of the joint surface and yet a satisfactory 

 recovery ensue. 



FRACTURE OF THE POINT OF THE HOCK. 



This may merely implicate the extreme summit of the bone 

 in young horses, or it may occur lower down in the middle of 

 the bony process. There is much lameness and difficulty in 

 bringing the foot to the ground, the limb being often kept 



