Orthognathic surgical implant assembly having pre-osteotomy and post-osteotomy alignment members

A customized, patient-specific implant assembly configured to fixedly position a first bone segment relative to a second bone segment across an osteotomy gap, the first and second bone segments having surface topographies, the implant assembly comprising:

• one or more fixation bone plates each comprising a pre-osteotomy conforming portion and a post-osteotomy conforming portion joined by a transition portion, the transition portion of the one or more fixation bone plates configured to span the osteotomy gap;
• wherein the pre-osteotomy conforming portion is configured to conform to a portion of the first bone segment surface topography, and wherein the post-osteotomy conforming portion is configured to conform to a portion of the second bone segment surface topography;
• bone screws configured to affix the one or more fixation bone plates to bone across the osteotomy gap;
• bone screw apertures configured to receive the bone screws, the bone screw apertures disposed in the pre-osteotomy conforming portions and the post-osteotomy conforming portions of the one or more fixation bone plates;
• one or more removable pre-osteotomy conforming alignment plates connected to the pre-osteotomy conforming portions of the one or more fixation bone plates by severable bridging members;
• wherein the one or more removable pre-osteotomy conforming alignment plates are configured to conform to a portion of the surface topography of the first bone segment different from the portion of the first bone segment surface topology conformed to by the pre-osteotomy conforming portion of the one or more fixation bone plates;
• one or more removable post-osteotomy conforming alignment plates connected to the post-osteotomy conforming portions of the one or more fixation bone plates by severable bridging members;
• wherein the one or more removable post-osteotomy conforming alignment plates are configured to conform to a portion of the surface topography of the second bone segment different from the portion of the second bone segment surface topology conformed to by the post-osteotomy conforming portion of the one or more fixation bone plates;
• wherein the assembly is configured such that, with the one or more fixation plates affixed across the osteotomy gap with the bone screws, the one or more removable pre-osteotomy conforming alignment plates and the one or more removable post-osteotomy conforming alignment plates are removable from the one or more fixation plates by severing the bridging members.