What type of splint applies constant pull along the length of the lower extremity for stabilization?

A traction splint is specifically designed to apply a continuous pulling force along the length of a lower extremity, which helps stabilize fractures, particularly in the femur. This type of splint is crucial in decreasing pain and preventing further injury by aligning the bone ends and reducing muscle spasms. The constant pull helps to counteract muscle contractions, which can complicate a fracture situation.

In contrast, a pneumatic splint is an inflatable device used primarily for immobilization and may provide some degree of compression and support but does not apply the necessary traction. A flail segment pertains to a situation with multiple rib fractures causing instability in the chest wall and is not related to the stabilization of limb fractures. A greenstick splint typically refers to a specific type of fracture in children where the bone bends and cracks on one side without breaking completely through, but it does not provide the pulling mechanism associated with traction splints.

Overall, the unique design and purpose of the traction splint make it the correct choice for providing stabilization through constant pull in lower extremity conditions.