a biocompatible bonding material is applied as an intermediary to attach prosthesis to boney tissue . the bonding material has the strength and rapid setting characteristics of pmma cement , and is incorporated by the supporting bone as the boney ingrowth and osteogenic growth processes take place . in one embodiment , the bonding material is comprised of calcium phosphate polymer that provides immediate hardening and bonding , thereby locking the prosthesis to the bone . the biologic bond allows for bone in - growth over a period of weeks providing long term fixation . the immediate bonding can eliminate the early loosening that commonly occurred with uncemented joint replacements .