A fusion device for facilitating arthrodesis in the disc space between adjacent vertebrae, comprising: a hollow load bearing body (11') having an outer surface and an internal surface defining a chamber for an osteogenic material and a first opening (15a) in communication with said chamber, said body defining a second opening (24') extending from said internal surface to said outer surface; and a cap (300) having an occlusion body (301) configured for engagement with said first opening and an elongate anchor (325) projecting from said occlusion body, said anchor including a first end attached to said occlusion body and an opposite second end having engaging means (315) for engaging said second opening to hold said occlusion body within said first opening.
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