A canulated screw is a type of orthopedic screw that has a hollow center, or "canulation," running through the middle. This design allows for the insertion of a guide wire or other instruments through the screw to aid in precise placement during surgery.
Canulated screws are commonly used in various orthopedic procedures, including the fixation of fractures, particularly in bones like the femur, tibia, and pelvis. The hollow design also helps to reduce the risk of complications during insertion, as it allows for more accurate placement and alignment.