Two types of new composite implant materials are investigated. Their mechanical characteristics, biocompatibility, and the dynamics of bond strength between the biocomposites and a live bone tissue are determined. The first type of the biomaterials is based on silicate glass (SG) and hydroxyapatite. Both the natural (NHAp) and a synthetic hydroxyapatite (HAp) were used. The second type of the biomaterials was made from an ultrahigh-molecular polyethylene (UHMMPE) and the natural hydroxyapatite. Composite materials of both the types were implanted in the rabbit femur. The bond strength between the bone tissue and the implants was determined within 2, 4, 10, and 25 weeks.