Interference Screws: Anterior Cruciate Ligament Reconstruction

Interference screws are used to secure tendons or bone grafts in place. They are most frequently used for repair of the anterior cruciate ligament. For an ACL repair, bone tunnels are drilled in the tibia and femur as shown above. A tendon autograft is then passed into the holes. The graft may contain attached bone. The interference screws are then inserted which force the tendon or graft again bone fixing it in place. In the above radiograph, two different types of screws are shown. There has been a fracture through the tibial plateau where the screw was placed. A generic type interference screw is shown on the right.