Retrograde fixation technique with insert-molded interference screw

Abstract

Endosteal fixation of a ligament graft with a bioabsorbable interference screw installed in a retrograde manner in ACL reconstruction. The bioabsorbable interference screw is insert-molded with a length of suture extending from the distal tip of the screw for pulling the interference screw into the joint and into position for retrograde insertion at the top of the tibial tunnel. The interference screw has a cannulation extending partially through the screw from the leading tip. The cannulation is shaped to receive a correspondingly shaped driver. The driver is inserted into the tibial tunnel to engage the screw. By turning the driver, the interference screw is turned into the tibial tunnel in a retrograde manner. Accordingly, interference fixation of the graft near the tibial plateau is provided, thereby eliminating graft abrasion at the tibial plateau tunnel opening.

1 - 10 . (canceled) 
   
   
       11 . A method of anterior cruciate ligament reconstruction, the method comprising the steps of:
 forming a femoral socket in a femur;   feeding a length of suture extending from a leading tip of an interference screw into the joint cavity and through a tunnel extending from the socket to the exterior of the femur, the suture being insert-molded into the interference screw;   placing a ligament graft in the femoral socket;   drawing on the free end of the suture to pull the interference screw into the joint cavity into axial alignment with the socket;   using a driver to engage a cannulation extending into the interference screw; and   screwing the interference screw into the socket by turning the driver.   
   
   
       12 . The method of  claim 11 , wherein the cannulation extends into a back end of the interference screw, and the interference screw is screwed forwardly into the socket. 
   
   
       13 . The method of  claim 11 , wherein the cannulation extends into the leading tip of the interference screw, and the interference screw is screwed in retrograde fashion into the socket.