Osteogenic implants with combined implant materials and methods for same

An osteogenic implant for promoting bone growth between first and second bone surfaces, comprising:

• a first resorbable implant material defining an implant body configured for receipt between the first and second bone surfaces, said first resorbable implant material comprising a porous collagenous matrix containing mineral particles, said implant body having an outer surface;
• the first resorbable implant material being substantially free of an osteogenic protein;
• a second resorbable implant material comprising a collagen sponge sheet wrapped around at least a portion of said outer surface of said implant body and positioned to contact said first and second bone surfaces;
• and
• an osteogenic protein carried by said second resorbable implant material.