Which condition is an indication for using a Sager traction splint?

The indication for using a Sager traction splint is a fracture of the shaft of the femur. This type of splint is specifically designed to stabilize long bone fractures, particularly in the mid-shaft of the femur. When a femoral shaft fracture occurs, it can lead to significant pain, potential blood loss, and further injury due to movement. The Sager traction splint applies longitudinal traction to realign the fractured bones, thereby reducing pain and preventing further displacement, which is crucial for both patient comfort and effective transport to medical facilities.

When considering the other conditions listed, a dislocated shoulder does not require traction and is managed differently; it typically involves stabilization and reduction techniques. Similarly, a fractured ankle does not necessitate the long traction that a Sager splint provides, as it is a distal bone and can be managed with other types of splints or immobilization. A sprained knee also does not indicate the need for a Sager traction splint, as it is a soft tissue injury requiring supportive care rather than the rigid stabilization provided by traction. Thus, the selection of the Sager traction splint is specific to femoral shaft fractures where proper alignment and stabilization are essential for the patient's safety and outcome.