Osteosynthesis screw fastener having angularly adjustable threads and methods of use therefor

An osteosynthetic fastener, comprising:

• a housing having:
• (a) an interior chamber;
• and (b) an exterior surface with an opening to said interior chamber, said exterior surface being for contacting a fastener attachment surface;
• and
• an attachment means having a threaded bore which is closed at one end and which is configured to receive a bone setting shaft, said attachment means having an outer surface and being secured in said interior chamber so that the bone setting shaft is received through said opening at any one of a plurality of orientations relative to said exterior surface, said outer surface of said attachment means conforming to the shape of said interior chamber such that said attachment means cannot easily rotate about an axis,
• whereby attaching said attaching means to the bone setting shaft secures said housing against the attachment surface.

A method for securing bone fractures, comprising:

• providing a hole through bone material through which a threaded screw can pass;
• inserting a threaded screw through said opening;
• engaging said threaded screw with a screw fastener capable of engaging said threaded screw, said screw fastener comprising:
• a housing having an interior chamber and an exterior surface;
• and
• a threaded means having an outer surface positioned within said interior chamber, said threaded means having a threaded bore which is closed at one end and which is configured to receive a threaded portion of a screw to threadably secure said screw fastener on said screw, said threaded means being adjustable relative to said housing for receiving said threaded screw portion at a plurality of angles, wherein the shape of said outer surface of said threaded means conforms to the shape of said interior chamber such that substantially the entirety said outer surface of said threaded means has a high coefficient friction with respect to said interior chamber to prevent undesired rotational movement.