DISEASES OF BONES 179 



Depending on the cause of the disease, what variety of inflam- 

 mations are considered in bony inflammations ? 

 The causes may be traumatic (due to external assaults), 

 specific (as tuberculous, glanderous, etc.), bematogenous 

 (originating in the blood), septic and aseptic, primary and 

 secondary. 



Periostitis. 



What is periostitis ? 



Inflammation of the highly nervous and vascular fibrous 

 membrane covering the bone, termed periosteum. 



What forms of periostitis are of interest to the surgeon f 



1. Acute, aseptic or traumatic periostitis. 



2. Chronic ossifying periostitis. 

 ! 3. Acute purulent periostitis. 



' 4. Chronic purulent periostitis. 

 5. Chronic fibrous periostitis. 



Describe acute aseptic periostitis. 



This form of periostitis is the result of contusions, blows, 

 as kicks, interfering, pressure from the bit upon the inter- 

 dental space, or is seen as a consequence of simple subcu- 

 taneous fracture, and, as the name indicates, runs its course 

 without the presence of pus producing bacteria in the affected 

 tissues. 

 What are the symptoms of acute aseptic periostitis ? 



The periosteum being highly endowed with nerves, pal- 

 pation elicits decided pain and circumscribed doughy swell- 

 ing. When affecting bones of the extremities, there is 

 lameness, or when iuTolving the interdental space of the 

 lower jaw, the animal will not tolerate the bit, is more or less 

 head shy, etc. 



