摘要 |
An interbody spinal fusion implant (20) for insertion across a disc space between adjacent vertebral bodies of a human spine has a body (22) two top side and two bottom side junctions, with at least a pair of diagonally oppos ed junctions having a distance therebetween that does not significantly exceed the implant body height. The implant (20) also includes one or more bone penetrating protrusions (36) extending outwardly from at least the upper and lower walls of the implant. The implant (20) is inserted on its side (28, 28 ') between adjacent vertebral bodies and then rotated 90 degrees into place. Th e protrusionsm (36) penetrate the endplates upon rotation, thereby securing th e implant (36) within the spine. The implant (20) has at least one passage (38 , 38') therethrough from the upper wall (30) to the lower wall (30') to promot e fusion through the implant (20). Because of the specialized opposed junction s overdistraction between the adjacent vertebral bodies is avoided when the implant (20) is rotated from an initial insertion position to a final deploy ed position.
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