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An orthopedic interference screw for compression anchoring a bone graft in a bore formed in a bone mass. The interference screw includes a biocompatible body with a root. A screw thread is formed over substantially all of the root. The screw thread includes buttress structure on only one side of the

An orthopedic interference screw for compression anchoring a bone graft in a bore formed in a bone mass. The interference screw includes a biocompatible body with a root. A screw thread is formed over substantially all of the root. The screw thread includes buttress structure on only one side of the screw thread so that forces applied to the screw thread from a side remote from the buttress structure will be buttressed by the buttress structure.

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[ What is claimed is:] [1.] An orthopedic interference screw for compression anchoring a bone graft in a bore formed in a bone mass, said screw comprising:a biocompatible body with a root having front and back ends and further including a root front section and a root back section separated by a jun

[ What is claimed is:] [1.] An orthopedic interference screw for compression anchoring a bone graft in a bore formed in a bone mass, said screw comprising:a biocompatible body with a root having front and back ends and further including a root front section and a root back section separated by a juncture, each section having an outer surface, said root front section including a uniform taper over a majority of a longitudinal length thereof at a root taper angle to a longitudinal axis of said screw between said front end and a juncture between said root front section and said root back section, said root back section including a cylindrical form between said juncture and said back end;a screw thread formed over substantially all of said root, said screw thread including a crest with a uniform surface area along a length thereof and uniformly spirally expanding from said outer surface of said root from said front end to said juncture so that an aggregate of said crests between said front end and said juncture form a crest taper angle greater than said root taper angle, an aggregate of all of said crests on said screw thread oriented between said back end and said juncture on said back section being contained in a theoretical cylindrical surface concentric with said cylindrical form of said root back section.