FRACTURE OF THE OS INNOMINATUM 499 



with talcum powder. The first bandage is of four-inch 

 cheese cloth wrapped neatly and evenly from the upper third 

 of the cannon to the level of the coronet. The talcum pow- 

 der, may be sprinkled into the hair as this bandage is being 

 applied. A retention bandage consisting of electrician's insu- 

 lation tape is then wrapped neatly, layer after layer, from the 

 upper third of the cannon to the floor until it reaches a uni- 

 form thickness of about an inch. A piece of soft wood, whit- 

 tled to fit loosely into the hollow of the fetlock is then ad- 

 justed and retained by enough additional wraps of the tape 

 to fix it firmly. 



After two weeks the bandage is removed and refitted to 

 afford an opportunity to treat any wounds it may have pro- 

 duced by pressure. At the end of four weeks it is dispensed 

 with and substituted by an ordinary fabric bandage which 

 may be removed and reapplied daily. 



During the first two weeks it is important to draw the 

 slings-tight enough to prevent the injured foot from support- 

 ing weight, providing too much discomfort is not produced 

 thereby. 



Fracture of the Os Innominatum. 



This is the most common of all fractures of horses. In 

 almost every case it is caused by falling heavily, but in some 

 cases occurs by slipping or by striking the side of the stable 

 door. 



The most common varieties of these fractures are: (i) 

 Fracture of a part of the external angle of the ilium; (2) 

 fractures of the whole angle at different points toward the 

 center of the bone; (3) fracture of the shaft of the ilium; 

 (4) fractures through the acetabulum; (5) fracture of the 

 shaft of the ischium; (6) fracture of the ischial tuberosity; 

 (7) fractures of the pubis — often bilateral; (8) separation 

 of the ischio-pubic symphysis ; and (9) fracture of both ischii. 



I. Fracture of a Part of the External Angle of the Ilium. 

 — The inferior portion is the part broken, and the serious- 

 ness depends upon the size of the segment, which may vary 

 from a very small section of the very angle to a piece as large 

 as a man's hand, extending from the uppermost angle back- 

 ward toward the shaft. 



This is the least serious of all the pelvic fractures. When 

 only a small segment is broken the accident causes only a 

 passing inconvenience to the patient, and often goes unno- 

 ticed. The deformity is slight and almost imperceptible, 



