Interference Screw Technique
In 1997, Pinczewski and colleagues described fixation of a quadruple hamstring graft with a titanium metal interference screw. Shortly thereafter, Fu reported use of a biodegradable interference screw for the same purpose, and Brand and associates described the use of this fixation device for a quadriceps tendon ACL graft. Such interference fixation improves the fixation stiffness above that of a post and washer or closed-loop button fixation. According to Brand et al, interference fixation of a soft-tissue graft results in direct-contact healing of the graft to bone instead of formation of fibrous interface as seen with extra-articular fixation (post and screw, loop button, staple, etc).