Interference screw with rounded back end and cannulated sheath f

Details Interference screw with rounded back end and cannulated sheath f Interference screw with rounded back end and cannulated sheath f

1993-06-04

1995-06-20

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606 73, 606 96, 606 86, A61B 1758

Patent

active

054257336

ABSTRACT:
An interference screw and sheath for endosteal fixation of ligaments. A graft, attached between previously cut bone blocks, is placed under tension in a graft tunnel. The screw is driven between the bone to which the graft is being fixed and a corresponding one of the bone blocks. The screw includes an end portion having rounded back edges for protecting the graft from inadvertent damage after the sheath has been removed. The screw may be cannulated for insertion over a prepositioned guide pin. The guide pin has a larger than normal diameter to prevent the pin from bending during insertion. The screw cannulation is sufficiently large to accommodate the enlarged guide pin. The sheath has a cutout at one end such that during screw insertion, the graft is covered by the sheath and protected from the threads of the screw, while the bone to which the graft is being fixed is exposed to the threads of the screw.

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M. Kurosaka et al. "A Biomechanical Comparison of Different Surgical Techniques of Graft Fixation in Anterior Cruciate Ligament Reconstruction," Am. J. Sports Med., vol. 15, No. 3 (1987).
K. Lambert, "Vascularized Patellar Tendon Graft with Rigid Internal Fixation for Anterior Cruciate Ligament Insufficiency" Clinical Orthopaedics and Related Research, No. 172 (Jan.-Feb. 1983).

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