Articular facet interference screw

摘要

The bone screw ( 1 ) is used for locking an articular facet between the superior and inferior articular processes of two vertebral bodies and is provided with a threaded shaft ( 2 ), a screw head ( 3 ) and a central axis ( 4 ). The screw head ( 3 ) is further provided with a number of grooves ( 5 ) on the periphery of the screw head ( 3 ) which run essentially parallel to said central axis ( 4 ).