and the degree of stability of the hemipelvis. Open-book type AP compression fractures of the pelvis can be treated by simple reduction followed by immobilization in a pelvic sling, plaster spica, or with external fi xators. The lateral compression fractures all produce some degree of inward rotation of the hemipelvis and often reduce spontaneously while in the supine position but may require external rotation forces to reduce the fracture. Complete bed rest with traction through a supracondylar femoral pin or with external fi xators are the recommended means of immobilization. Vertical shear fractures are easily reduced with traction through a supracondylar pin or with external fi xators. Maintaining reduction is diffi cult, however, and these fracture types often require long periods of immobilization due to their high degree of instability. Open reduction may be indicated for vertical shear fractures when adequate reduction cannot be maintained by way of closed reduction or external fi xators. Associated acetabular fracture is another indication for open reduction in these cases. Pelvic fractures must be assessed and treated quickly in order to avoid further complications or diffi culties in treatment.
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