title: In vivo properties of an intramedullary hydroxyapatite plug to improve femoral stem fixation.
abstract: An intramedullary hydroxyapatite (HA) plug was inserted in each tibia of five rabbits. Histological observation showed the presence of newly formed bone tissue bridging between the inner cortex and the HA plug at 3 months postoperatively. This new bone was in direct contact with the HA plug, and there was no fibrous tissue intervention. Based on these results, the HA plug was used in a hip hemiarthroplasty with bone cement. The radiograph taken 4 years postoperatively showed that the plug-bone interface was indistinct, and some of the plug's edges became rounded by replacement with newly developed bone. The femoral component was stable without subsidence. The HA plug stabilized by bone ingrowth in the femoral canal would certainly be useful to prevent the femoral component from subsiding, in addition to increasing the cement-bone interface pressure at the time of surgery.
authors.affiliation: Department of Orthopaedic Surgery, Chushin Matsumoto National Hospital, Nagano, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Maruyama
mesh_terms: D000368:Aged; D000818:Animals; D001672:Biocompatible Materials; D017886:Durapatite; D005260:Female; D005269:Femur / Q000473:pathology / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D016348:Osseointegration; D019736:Prostheses and Implants; D011817:Rabbits; D013499:Surface Properties; D013977:Tibia / Q000473:pathology / Q000601:surgery
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite