Norian SRS (Synthes Corp, Paoli, Pa),
BoneSource (Stryker Orthopaedics, Mahwah, NJ), and Callos (Skeletal Kinetics, Cupertino, Calif) are calcium phosphate cements that are mixed in the operating room, injected into poor-quality bone, and cure to develop compressive strength about midway between that of cancellous and cortical bone.