Interbody prosthetic device with compound-arc, blade anchor

An implant sized and shaped to fit between first and second bones adjacent one another to cause joinder therebetween, the implant comprising:

• a body having an outside surface;
• a plate fixed in rigid engagement within, and forming a boundary surface coincident with the outside surface of, the body, the plate the plate including a first fastener hole, and a second fastener hole;
• a first fastener having a first head and a first shank, the first fastener hole being configured to retain the first head in an orientation directing the first shank along a first helical central axis into the first bone;
• a second fastener having a second head and a second shank, the second fastener hole being configured to retain the second head in an orientation directing the second shank along a second helical axis thereof into the second bone;
• wherein the first shank and second shank transition in cross-section along the first and second helical axes, respectively, from a cross-section of the first head and second head, respectively, to splines extending radially away from the first and second helical axes, respectively, and axially away from the first head and second head, respectively;
• wherein the first shank and second shank transition in cross-section along the first and second helical axes, respectively, from a cross-section of the first head and second head, respectively, to splines extending radially away from the first and second helical axes, respectively, and axially away from the first head and second head, respectively.

A method to connect a first bone to a second bone in compressive relation encouraging growing together into a single bone, the method comprising:

• providing an implant comprising a body having a comparatively harder portion as a receiver plate and a comparatively softer portion as an insert, the harder portion being fitted in a fixed yet removable relation with the insert and provided with apertures;
• providing fasteners, sized to fit firmly and fixedly in the apertures, each fastener having a central axis proceeding from a head portion at a proximal end to a distal end, a shank portion extending from the head portion to the distal end, the central axis being curved along a helical path, and the shank portion comprising splines extending radially away from the central axis;
• preparing a first surface on the first bone and a second surface on the second bone;
• inserting the implant against the first and second surfaces;
• inserting fasteners through the apertures, the fasteners being guided by the apertures;
• driving each of the fasteners into one of the first and second bones, each of the fasteners proceeding along the central axis thereof along the helical path.