FRACTURE OF THE OS INNOMINATUM 



501 



sharp end of the fractured shaft may penetrate the ab- 

 dominal or pelvic viscera, and sometimes wounds large 

 vessels with serious if not fatal results. 



4. Fracture through the Acetabulum is announced by 

 an immediate inability to support weight and by great pain 

 and suffering. Recovery is rare, and when the patient does 

 survive the long painful ordeal, the lameness is permanent. 



5. Fracture of the Shaft of the Ischium is usually accom- 

 panied with fracture of the pubis from the obturator fora- 

 men to the symphysis, and then backward along the sym- 

 physis to the ischial arch. It is caused by falling upon the 

 haunches. The lameness is pronounced and the pain in- 

 tense, although the full weight is supported on the affected 

 side. The patient is incapacitated for work for six weeks 







Fig? 250 — Fractures of the Os Innominatum. 

 a, c — Fractures o£ the Angle of the Ilium, b — Fracture o£ the Shaft of the 

 Ilium, d— Fracture of the Acetabulum, e— Fracture of the Shaft of- 

 the Ischium. ^—Fracture of the Ischial Tuberosity. 



to two months and is never entirely sound thereafter. The 

 buttock is depressed and lameness continues indefinitely 

 while trotting. 



6. Fracture of the Ischial Tuberosity would appear to 

 be a rather trivial injury as compared with the other pelvic 

 fractures. On the contrary, it is always a serious affair in 

 that chronic lameness supervenes despite a long period of 

 rest, and the deformity is conspicuous enough. 



7, 8 and 9. These fractures implicating the pubes and 

 ischii are always serious. They are usually complicated 

 with visceral inflammation or visceral injury, besides produc- 

 ing a disability lasting for months, often ending in the in- 



